Climate and average weather in Sintra-Nema
In Sintra-Nema, the weather is sweltering, wet, and clear and remarkably steady, with daytime highs holding near sweltering levels all year. The wettest stretch peaks around August.
Over the course of the year, the temperature in Sintra-Nema typically varies from 21°C to 35°C, and is rarely below 18°C or above 38°C. March is the hottest month of the year, while August is the coldest.
Based on the travel score, the best times of year to visit Sintra-Nema for warm-weather activities are from late April to late June and late October to mid February.
- Hottest
- Mar
- 35°
- Coldest
- Aug
- 25°
- Wettest
- Aug
- 452 mm
- Driest
- Mar
- 0 mm
- Rain / yr
- 1372 mm
- 125 wet days
- Daylight
- 11.3–12.7 h
- shortest–longest
- Elevation
- 11 m
- 11.9°N
- Clearest
- Mar
- 27% cloud
Sintra-Nema weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around late October to mid February.
Temperature through the year
Daily average highs and lows in Sintra-Nema, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Sintra-Nema stay fairly even through the year, without a distinct hot or cool season. The warmest month is March, with an average high of 35°C and low of 23°C; the coolest is August, with an average low of 25°C and high of 29°C.
Days typically run about 9°C warmer than nights, with the widest day–night swing (around 13°C) in February.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 34 | 35 | 35 | 33 | 32 | 30 | 29 | 30 | 31 | 33 | 33 |
| Avg low (°C) | 21 | 22 | 23 | 24 | 25 | 26 | 25 | 25 | 25 | 25 | 24 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 33 | 21 |
| Feb | 34 | 22 |
| Mar | 35 | 23 |
| Apr | 35 | 24 |
| May | 33 | 25 |
| Jun | 32 | 26 |
| Jul | 30 | 25 |
| Aug | 29 | 25 |
| Sep | 30 | 25 |
| Oct | 31 | 25 |
| Nov | 33 | 24 |
| Dec | 33 | 22 |
How hot and cold Sintra-Nema really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, Sintra-Nema feels like about 40°C (around October 28). Nearly every day a year carries some heat stress, and 23 of them tip into dangerous heat (feels-like above 39°C), peaking in October.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 33 | 34 | 36 | 37 | 37 | 38 | 35 | 34 | 36 | 39 | 37 | 33 |
| Air high (°C) | 33 | 34 | 35 | 35 | 33 | 32 | 30 | 29 | 30 | 31 | 33 | 33 |
| Feels-like low (°C) | 21 | 22 | 23 | 24 | 25 | 26 | 25 | 25 | 25 | 25 | 24 | 22 |
| Air low (°C) | 21 | 22 | 23 | 24 | 25 | 26 | 25 | 25 | 25 | 25 | 24 | 22 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 33 | 33 | 21 | 21 |
| Feb | 34 | 34 | 22 | 22 |
| Mar | 36 | 35 | 23 | 23 |
| Apr | 37 | 35 | 24 | 24 |
| May | 37 | 33 | 25 | 25 |
| Jun | 38 | 32 | 26 | 26 |
| Jul | 35 | 30 | 25 | 25 |
| Aug | 34 | 29 | 25 | 25 |
| Sep | 36 | 30 | 25 | 25 |
| Oct | 39 | 31 | 25 | 25 |
| Nov | 37 | 33 | 24 | 24 |
| Dec | 33 | 33 | 22 | 22 |
Average hourly temperature in Sintra-Nema
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on March afternoons, near 35°C, and coldest before dawn in August, near 25°C.
Sintra-Nema weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 33° / 21° | 0 | 0.1 | 11.4 | 4.4 |
| Feb | 34° / 22° | 1 | 0.1 | 11.6 | 3.6 |
| Mar | 35° / 23° | 0 | 0 | 11.9 | 3.3 |
| Apr | 35° / 24° | 0 | 0 | 12.3 | 3.6 |
| May | 33° / 25° | 6 | 1.3 | 12.5 | 4.1 |
| Jun | 32° / 26° | 87 | 12 | 12.7 | 3.8 |
| Jul | 30° / 25° | 352 | 27.8 | 12.6 | 3.0 |
| Aug | 29° / 25° | 452 | 29.3 | 12.4 | 2.9 |
| Sep | 30° / 25° | 307 | 27.7 | 12.1 | 2.8 |
| Oct | 31° / 25° | 142 | 22 | 11.7 | 3.2 |
| Nov | 33° / 24° | 23 | 4.6 | 11.5 | 4.2 |
| Dec | 33° / 22° | 2 | 0.3 | 11.3 | 4.4 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Sintra-Nema gets about 1372 mm of precipitation a year. On a typical day the chance of rain is often wet, but that rises and falls sharply with the seasons.
The wetter season lasts 4.7 months, from around Jun 15 to Nov 4, peaking in August at about 95% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jan 23.
August is the wettest month by volume, with 452 mm over about 29 wet days; March is the driest, with 0 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 0 | 1 | 0 | 0 | 5 | 40 | 88 | 95 | 92 | 70 | 17 | 1 |
| Rain days | 0 | 0 | 0 | 0 | 1 | 12 | 28 | 29 | 28 | 22 | 5 | 0 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 1 | 0 |
| Mar | 0 | 0 |
| Apr | 0 | 0 |
| May | 5 | 1 |
| Jun | 40 | 12 |
| Jul | 88 | 28 |
| Aug | 95 | 29 |
| Sep | 92 | 28 |
| Oct | 70 | 22 |
| Nov | 17 | 5 |
| Dec | 1 | 0 |
Monthly rainfall
Over a full year, Sintra-Nema collects about 1372 mm of rain across 125 wet days — roughly 114 mm in an average month.
It doesn’t fall evenly. August is the wettest month with 452 mm, while March is the driest at just 0 mm. The three wettest months alone bring about 81% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 0 | 1 | 0 | 0 | 6 | 87 | 352 | 452 | 307 | 142 | 23 | 2 |
| Rain days | 0 | 0 | 0 | 0 | 1 | 12 | 28 | 29 | 28 | 22 | 5 | 0 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 1 | 0 |
| Mar | 0 | 0 |
| Apr | 0 | 0 |
| May | 6 | 1 |
| Jun | 87 | 12 |
| Jul | 352 | 28 |
| Aug | 452 | 29 |
| Sep | 307 | 28 |
| Oct | 142 | 22 |
| Nov | 23 | 5 |
| Dec | 2 | 0 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Sintra-Nema, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around October 29 and lasts for 7.0 months, ending around May 29. The clearest month is March, when the sky is clear, mostly clear, or partly cloudy 83% of the time on average.
The cloudier part of the year begins around May 30 and lasts for 5.0 months, ending around October 28. The cloudiest month is August, when it is overcast or mostly cloudy 92% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 72 | 78 | 83 | 79 | 66 | 31 | 12 | 8 | 16 | 41 | 59 | 64 |
| Cloudier (%) | 28 | 22 | 17 | 21 | 34 | 69 | 88 | 92 | 84 | 59 | 41 | 36 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 72 | 28 |
| Feb | 78 | 22 |
| Mar | 83 | 17 |
| Apr | 79 | 21 |
| May | 66 | 34 |
| Jun | 31 | 69 |
| Jul | 12 | 88 |
| Aug | 8 | 92 |
| Sep | 16 | 84 |
| Oct | 41 | 59 |
| Nov | 59 | 41 |
| Dec | 64 | 36 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 3, brings about 12 h 42 min of light; the shortest, around January 1, only 11 h 18 min — a swing of roughly 1 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.4 | 11.6 | 11.9 | 12.3 | 12.5 | 12.7 | 12.6 | 12.4 | 12.1 | 11.7 | 11.5 | 11.3 |
| Sunrise (AM) | 7:30 | 7:29 | 7:14 | 6:55 | 6:42 | 6:42 | 6:49 | 6:55 | 6:55 | 6:55 | 7:04 | 7:19 |
| Sunset (PM) | 6:53 | 7:05 | 7:10 | 7:11 | 7:15 | 7:23 | 7:27 | 7:18 | 6:59 | 6:39 | 6:31 | 6:38 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 11.4 | 7:30 | 6:53 |
| Feb | 11.6 | 7:29 | 7:05 |
| Mar | 11.9 | 7:14 | 7:10 |
| Apr | 12.3 | 6:55 | 7:11 |
| May | 12.5 | 6:42 | 7:15 |
| Jun | 12.7 | 6:42 | 7:23 |
| Jul | 12.6 | 6:49 | 7:27 |
| Aug | 12.4 | 6:55 | 7:18 |
| Sep | 12.1 | 6:55 | 6:59 |
| Oct | 11.7 | 6:55 | 6:39 |
| Nov | 11.5 | 7:04 | 6:31 |
| Dec | 11.3 | 7:19 | 6:38 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Sintra-Nema averages about 11 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 0 and 22 days.
The sunnier stretch runs 6.7 months, from around Nov 6 to May 27. The sunniest month is April, with roughly 20 sunny days (bright).
The greyest month is August, down near 0 sunny days — about 100% fewer than the April peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 18 | 18 | 22 | 20 | 15 | 4 | 1 | 0 | 1 | 5 | 12 | 15 |
| Sky | Bright | Bright | Bright | Bright | Mixed | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 18 | Bright |
| Feb | 18 | Bright |
| Mar | 22 | Bright |
| Apr | 20 | Bright |
| May | 15 | Mixed |
| Jun | 4 | Gloomy |
| Jul | 1 | Gloomy |
| Aug | 0 | Gloomy |
| Sep | 1 | Gloomy |
| Oct | 5 | Gloomy |
| Nov | 12 | Mixed |
| Dec | 15 | Mixed |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Sintra-Nema, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 8.1 months, from around March 26 to November 28. The muggiest month is May, when the air feels humid, muggy or worse about 100% of the time.
The most comfortable stretch runs from around November 29 to March 25, and January is the most comfortable month — the air is dry or comfortable 75% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 55 | 39 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 28 |
| Comfortable (%) | 21 | 18 | 17 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 22 |
| Humid (%) | 14 | 18 | 23 | 20 | 3 | 0 | 0 | 0 | 0 | 0 | 6 | 17 |
| Muggy (%) | 9 | 20 | 35 | 52 | 40 | 4 | 0 | 0 | 0 | 0 | 15 | 19 |
| Oppressive (%) | 2 | 4 | 12 | 23 | 51 | 46 | 34 | 36 | 25 | 11 | 35 | 13 |
| Miserable (%) | 0 | 0 | 0 | 0 | 6 | 49 | 66 | 64 | 75 | 89 | 39 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| Jan | 55 | 21 | 14 | 9 | 2 | 0 |
| Feb | 39 | 18 | 18 | 20 | 4 | 0 |
| Mar | 12 | 17 | 23 | 35 | 12 | 0 |
| Apr | 0 | 5 | 20 | 52 | 23 | 0 |
| May | 0 | 0 | 3 | 40 | 51 | 6 |
| Jun | 0 | 0 | 0 | 4 | 46 | 49 |
| Jul | 0 | 0 | 0 | 0 | 34 | 66 |
| Aug | 0 | 0 | 0 | 0 | 36 | 64 |
| Sep | 0 | 0 | 0 | 0 | 25 | 75 |
| Oct | 0 | 0 | 0 | 0 | 11 | 89 |
| Nov | 1 | 4 | 6 | 15 | 35 | 39 |
| Dec | 28 | 22 | 17 | 19 | 13 | 1 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Across the year, average wind speed in Sintra-Nema is typically calm, near 10 km/h, and varies moderately with the seasons.
The windier part of the year lasts 8.1 months, from around Dec 27 to Aug 29. The windiest month is May, averaging about 12 km/h (calm).
The calmer part of the year runs from around Aug 30 to Dec 26, with October the calmest month at about 7 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 10 | 10 | 11 | 11 | 12 | 11 | 10 | 10 | 8 | 7 | 7 | 9 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 10 | calm |
| Feb | 10 | calm |
| Mar | 11 | calm |
| Apr | 11 | calm |
| May | 12 | calm |
| Jun | 11 | calm |
| Jul | 10 | calm |
| Aug | 10 | calm |
| Sep | 8 | calm |
| Oct | 7 | calm |
| Nov | 7 | calm |
| Dec | 9 | calm |
Hazard calendar for Sintra-Nema
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Sintra-Nema sits in the Atlantic hurricane belt; the season peaks August–October.
Sintra-Nema's monsoon runs July–September, when most of the year's rain falls.
Sintra-Nema sees seasonal dust haze (February–June), heaviest in June.
Best time to visit Sintra-Nema
To characterize how pleasant the weather is in Sintra-Nema throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early November, Sintra-Nema is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best times of year to visit Sintra-Nema for general outdoor tourist activities run from late April to late June and again from late October to mid February, with a peak score in the first week of January.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 4.4 | 3.6 | 3.3 | 3.6 | 4.1 | 3.8 | 3.0 | 2.9 | 2.8 | 3.2 | 4.2 | 4.4 |
| Rating | fair | fair | poor | fair | fair | fair | poor | poor | poor | poor | fair | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 4.4 | fair |
| Feb | 3.6 | fair |
| Mar | 3.3 | poor |
| Apr | 3.6 | fair |
| May | 4.1 | fair |
| Jun | 3.8 | fair |
| Jul | 3.0 | poor |
| Aug | 2.9 | poor |
| Sep | 2.8 | poor |
| Oct | 3.2 | poor |
| Nov | 4.2 | fair |
| Dec | 4.4 | fair |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Sintra-Nema for hot-weather activities is from early November to mid June, with a peak score in the third week of January.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Sintra-Nema, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
Sintra-Nema packs about the same all year — highs hold near 35°C. Across the year the things worth having are light clothes, sun protection and rain gear.
In March, Sintra-Nema sees daytime highs around 35°C and nights near 23°C. Pack light clothes and sun protection.
Sea temperature near Sintra-Nema
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea at the nearest coast (about 27 km away) is warmest in November at about 29°C and coldest in February near 25°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 25 | 25 | 26 | 27 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 27 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Warm | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 25 | Warm |
| Feb | 25 | Warm |
| Mar | 26 | Warm |
| Apr | 27 | Warm |
| May | 28 | Warm |
| Jun | 28 | Tropical |
| Jul | 28 | Tropical |
| Aug | 28 | Warm |
| Sep | 28 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 27 | Warm |
UV index (midday) in Sintra-Nema by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Sintra-Nema peaks around August 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 7 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 11 | 13 | 11 | 11 | 12 | 12 | 13 | 12 | 11 | 9 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 11 | Extreme |
| Mar | 13 | Extreme |
| Apr | 11 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 7 | Very high |
Average hourly UV index in Sintra-Nema
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in August the burn window is concentrated in the middle of the day: about 8 hours a day reach index 3 (protection recommended), and 6 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 6.5 | 7.5 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7.5 | 7 | 6.5 |
| UV ≥ 6 (h/day) | 4 | 5.5 | 6 | 5.5 | 5.5 | 6 | 6 | 6 | 6 | 5.5 | 4.5 | 3.5 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 6.5 | 4 |
| Feb | 7.5 | 5.5 |
| Mar | 8 | 6 |
| Apr | 8 | 5.5 |
| May | 8 | 5.5 |
| Jun | 8 | 6 |
| Jul | 8 | 6 |
| Aug | 8 | 6 |
| Sep | 8 | 6 |
| Oct | 7.5 | 5.5 |
| Nov | 7 | 4.5 |
| Dec | 6.5 | 3.5 |
Air quality in Sintra-Nema by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Sintra-Nema is worst in February — around 86 µg/m³ PM2.5 (unhealthy), about 5.5× the cleanest month (August, 16 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 63 | 86 | 76 | 51 | 53 | 50 | 24 | 16 | 18 | 35 | 45 | 58 |
| Level | Unhealthy | Unhealthy | Unhealthy | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Poor | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 63 | Unhealthy |
| Feb | 86 | Unhealthy |
| Mar | 76 | Unhealthy |
| Apr | 51 | Poor |
| May | 53 | Poor |
| Jun | 50 | Poor |
| Jul | 24 | Moderate |
| Aug | 16 | Moderate |
| Sep | 18 | Moderate |
| Oct | 35 | Moderate |
| Nov | 45 | Poor |
| Dec | 58 | Unhealthy |
Growing season
Sintra-Nema is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Sintra-Nema banks about 6,560 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around April.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 522 | 505 | 588 | 573 | 592 | 557 | 532 | 522 | 517 | 564 | 553 | 536 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 522 |
| Feb | 505 |
| Mar | 588 |
| Apr | 573 |
| May | 592 |
| Jun | 557 |
| Jul | 532 |
| Aug | 522 |
| Sep | 517 |
| Oct | 564 |
| Nov | 553 |
| Dec | 536 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Sintra-Nema receives about 5.5 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 4.1 and 7.0 kWh/m².
The brighter stretch of the year lasts 5.0 months, from around Jan 11 to Jun 11. The brightest month is April, averaging about 7.0 kWh/m² (intense).
The dimmest month is August, down near 4.1 kWh/m² — roughly 41% less than the April peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.6 | 6.1 | 6.8 | 7.0 | 6.7 | 5.3 | 4.3 | 4.1 | 4.4 | 4.9 | 5.4 | 5.3 |
| Level | Bright | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 5.6 | Bright |
| Feb | 6.1 | Intense |
| Mar | 6.8 | Intense |
| Apr | 7.0 | Intense |
| May | 6.7 | Intense |
| Jun | 5.3 | Bright |
| Jul | 4.3 | Bright |
| Aug | 4.1 | Bright |
| Sep | 4.4 | Bright |
| Oct | 4.9 | Bright |
| Nov | 5.4 | Bright |
| Dec | 5.3 | Bright |
Where is Sintra-Nema?
Sintra-Nema sits at 11.9°N, 15.6°W, 11 m above sea level, in Guinea-Bissau. The nearest listed city is Bissau, 0.0 km away.
Topography around Sintra-Nema
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sintra-Nema.
Within 3 km, the terrain around Sintra-Nema has only modest variations in elevation — a maximum elevation change of 43 m around an average of 14 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 48 m; within 80 km, only modest variations in elevation — a maximum elevation change of 61 m.
The land around Sintra-Nema is covered by artificial surfaces (62%) within 3 km, water (44%) within 16 km, and trees (41%) and water (32%) within 80 km.
Guinea-Bissau travel facts
- Travel advisory
- Level 3
- Reconsider Travel
- Power plugs
- Type C / E / F
- 220 V · 50 Hz
- Prices
- ≈ 34% of US
- price level, 2025
- GDP per capita
- $1,124
- 2025
- Safe drinking water
- 24%
- of population, 2024
- Homicide rate
- 1.1
- per 100k, 2017
- Road deaths
- 32.2
- per 100k/yr, 2019
- Income group
- Low
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Sintra-Nema (11.8624°, -15.5974°, elevation 11 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).