Climate and average weather in Ilha Grande
In Ilha Grande, the weather is muggy, hot, wet, and clear and remarkably steady, with daytime highs holding near hot levels all year. The wettest stretch peaks around April.
Over the course of the year, the temperature in Ilha Grande typically varies from 25°C to 30°C, and is rarely below 25°C or above 30°C. August is the hottest month of the year, while March is the coldest.
Based on the travel score, the best time of year to visit Ilha Grande for warm-weather activities is from late June to mid December.
- Hottest
- Aug
- 30°
- Coldest
- Mar
- 25°
- Wettest
- Apr
- 343 mm
- Driest
- Sep
- 1 mm
- Rain / yr
- 1326 mm
- 148 wet days
- Daylight
- 11.8–12.2 h
- shortest–longest
- Elevation
- 0 m
- 2.9°S
- Clearest
- Sep
- 19% cloud
Ilha Grande 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 June to mid December.
Temperature through the year
Daily average highs and lows in Ilha Grande, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Ilha Grande stay fairly even through the year, without a distinct hot or cool season. The warmest month is August, with an average high of 30°C and low of 26°C; the coolest is March, with an average low of 25°C and high of 28°C.
Days typically run about 3°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 30 | 29 | 29 | 29 | 29 |
| Avg low (°C) | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 28 | 26 |
| Feb | 28 | 26 |
| Mar | 28 | 25 |
| Apr | 28 | 26 |
| May | 29 | 26 |
| Jun | 29 | 26 |
| Jul | 29 | 26 |
| Aug | 30 | 26 |
| Sep | 29 | 26 |
| Oct | 29 | 26 |
| Nov | 29 | 26 |
| Dec | 29 | 26 |
How hot and cold Ilha Grande 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, Ilha Grande feels like about 33°C (around May 18). About 265 days a year carry some heat stress, peaking in May.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 32 | 32 | 31 | 32 | 33 | 33 | 33 | 33 | 33 | 32 | 33 | 33 |
| Air high (°C) | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 30 | 29 | 29 | 29 | 29 |
| Feels-like low (°C) | 26 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
| Air low (°C) | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 32 | 28 | 26 | 26 |
| Feb | 32 | 28 | 25 | 26 |
| Mar | 31 | 28 | 25 | 25 |
| Apr | 32 | 28 | 26 | 26 |
| May | 33 | 29 | 26 | 26 |
| Jun | 33 | 29 | 26 | 26 |
| Jul | 33 | 29 | 26 | 26 |
| Aug | 33 | 30 | 26 | 26 |
| Sep | 33 | 29 | 26 | 26 |
| Oct | 32 | 29 | 26 | 26 |
| Nov | 33 | 29 | 26 | 26 |
| Dec | 33 | 29 | 26 | 26 |
Average hourly temperature in Ilha Grande
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 August afternoons, near 30°C, and coldest before dawn in March, near 25°C.
Ilha Grande 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 | 28° / 26° | 146 | 21.3 | 12.1 | 4.3 |
| Feb | 28° / 26° | 211 | 23.7 | 12.1 | 3.9 |
| Mar | 28° / 25° | 323 | 28.3 | 12 | 3.7 |
| Apr | 28° / 26° | 343 | 27.3 | 11.9 | 3.5 |
| May | 29° / 26° | 178 | 20.7 | 11.9 | 4.3 |
| Jun | 29° / 26° | 51 | 11.3 | 11.8 | 5.5 |
| Jul | 29° / 26° | 22 | 4.3 | 11.9 | 6.5 |
| Aug | 30° / 26° | 2 | 0.4 | 11.9 | 7.0 |
| Sep | 29° / 26° | 1 | 0.2 | 12 | 7.2 |
| Oct | 29° / 26° | 6 | 0.8 | 12.1 | 7.1 |
| Nov | 29° / 26° | 7 | 1.6 | 12.1 | 6.8 |
| Dec | 29° / 26° | 34 | 7.7 | 12.2 | 5.9 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Ilha Grande gets about 1326 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 5.5 months, from around Dec 27 to Jun 12, peaking in March at about 95% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Sep 2.
April is the wettest month by volume, with 343 mm over about 27 wet days; September is the driest, with 1 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 68 | 84 | 91 | 91 | 67 | 38 | 14 | 2 | 1 | 3 | 5 | 26 |
| Rain days | 21 | 24 | 28 | 27 | 21 | 11 | 4 | 0 | 0 | 1 | 2 | 8 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 68 | 21 |
| Feb | 84 | 24 |
| Mar | 91 | 28 |
| Apr | 91 | 27 |
| May | 67 | 21 |
| Jun | 38 | 11 |
| Jul | 14 | 4 |
| Aug | 2 | 0 |
| Sep | 1 | 0 |
| Oct | 3 | 1 |
| Nov | 5 | 2 |
| Dec | 26 | 8 |
Monthly rainfall
Over a full year, Ilha Grande collects about 1326 mm of rain across 148 wet days — roughly 110 mm in an average month.
It doesn’t fall evenly. April is the wettest month with 343 mm, while September is the driest at just 1 mm. The three wettest months alone bring about 66% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 146 | 211 | 323 | 343 | 178 | 51 | 22 | 2 | 1 | 6 | 7 | 34 |
| Rain days | 21 | 24 | 28 | 27 | 21 | 11 | 4 | 0 | 0 | 1 | 2 | 8 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 146 | 21 |
| Feb | 211 | 24 |
| Mar | 323 | 28 |
| Apr | 343 | 27 |
| May | 178 | 21 |
| Jun | 51 | 11 |
| Jul | 22 | 4 |
| Aug | 2 | 0 |
| Sep | 1 | 0 |
| Oct | 6 | 1 |
| Nov | 7 | 2 |
| Dec | 34 | 8 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Ilha Grande, 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 May 26 and lasts for 6.7 months, ending around December 16. The clearest month is September, when the sky is clear, mostly clear, or partly cloudy 95% of the time on average.
The cloudier part of the year begins around December 17 and lasts for 5.3 months, ending around May 25. The cloudiest month is April, when it is overcast or mostly cloudy 77% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 39 | 30 | 24 | 23 | 51 | 78 | 88 | 93 | 95 | 87 | 73 | 61 |
| Cloudier (%) | 61 | 70 | 76 | 77 | 49 | 22 | 12 | 7 | 5 | 13 | 27 | 39 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 39 | 61 |
| Feb | 30 | 70 |
| Mar | 24 | 76 |
| Apr | 23 | 77 |
| May | 51 | 49 |
| Jun | 78 | 22 |
| Jul | 88 | 12 |
| Aug | 93 | 7 |
| Sep | 95 | 5 |
| Oct | 87 | 13 |
| Nov | 73 | 27 |
| Dec | 61 | 39 |
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. Close to the equator, Ilha Grande barely changes through the year: days stay near 12 h 12 min of light in every season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.1 | 12.1 | 12.0 | 11.9 | 11.9 | 11.8 | 11.9 | 11.9 | 12.0 | 12.1 | 12.1 | 12.2 |
| Sunrise (AM) | 5:52 | 5:59 | 5:56 | 5:49 | 5:47 | 5:52 | 5:57 | 5:54 | 5:42 | 5:30 | 5:29 | 5:39 |
| Sunset (PM) | 6:01 | 6:05 | 5:58 | 5:46 | 5:40 | 5:43 | 5:48 | 5:49 | 5:41 | 5:34 | 5:36 | 5:48 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 12.1 | 5:52 | 6:01 |
| Feb | 12.1 | 5:59 | 6:05 |
| Mar | 12.0 | 5:56 | 5:58 |
| Apr | 11.9 | 5:49 | 5:46 |
| May | 11.9 | 5:47 | 5:40 |
| Jun | 11.8 | 5:52 | 5:43 |
| Jul | 11.9 | 5:57 | 5:48 |
| Aug | 11.9 | 5:54 | 5:49 |
| Sep | 12.0 | 5:42 | 5:41 |
| Oct | 12.1 | 5:30 | 5:34 |
| Nov | 12.1 | 5:29 | 5:36 |
| Dec | 12.2 | 5:39 | 5:48 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Ilha Grande averages about 15 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 2 and 27 days.
The sunnier stretch runs 6.3 months, from around Jun 2 to Dec 10. The sunniest month is September, with roughly 27 sunny days (brilliant).
The greyest month is April, down near 3 sunny days — about 90% fewer than the September peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 6 | 4 | 3 | 3 | 10 | 18 | 23 | 26 | 26 | 24 | 17 | 13 |
| Sky | Gloomy | Gloomy | Gloomy | Gloomy | Mixed | Bright | Bright | Brilliant | Brilliant | Brilliant | Bright | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 6 | Gloomy |
| Feb | 4 | Gloomy |
| Mar | 3 | Gloomy |
| Apr | 3 | Gloomy |
| May | 10 | Mixed |
| Jun | 18 | Bright |
| Jul | 23 | Bright |
| Aug | 26 | Brilliant |
| Sep | 26 | Brilliant |
| Oct | 24 | Brilliant |
| Nov | 17 | Bright |
| Dec | 13 | 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.
Ilha Grande is humid all year round — on a typical day the air feels at least humid, and there is no real dry season to wait for.
The stickiest month is January, when it feels muggy, oppressive or miserable about 100% of the time. Even in January, the mildest month, the air is dry or comfortable only 0% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 4 | 1 | 0 | 0 | 0 |
| Oppressive (%) | 75 | 69 | 65 | 57 | 55 | 91 | 97 | 96 | 99 | 100 | 96 | 84 |
| Miserable (%) | 25 | 31 | 35 | 43 | 45 | 9 | 0 | 0 | 0 | 0 | 4 | 16 |
| Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|
| Jan | 0 | 75 | 25 |
| Feb | 0 | 69 | 31 |
| Mar | 0 | 65 | 35 |
| Apr | 0 | 57 | 43 |
| May | 0 | 55 | 45 |
| Jun | 0 | 91 | 9 |
| Jul | 3 | 97 | 0 |
| Aug | 4 | 96 | 0 |
| Sep | 1 | 99 | 0 |
| Oct | 0 | 100 | 0 |
| Nov | 0 | 96 | 4 |
| Dec | 0 | 84 | 16 |
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 Ilha Grande is typically breezy, near 24 km/h, and varies a lot with the seasons.
The windier part of the year lasts 5.5 months, from around Jul 19 to Jan 1. The windiest month is October, averaging about 31 km/h (windy).
The calmer part of the year runs from around Jan 2 to Jul 18, with April the calmest month at about 17 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 22 | 20 | 18 | 17 | 19 | 21 | 24 | 27 | 30 | 31 | 29 | 27 |
| Feels | breezy | light breeze | light breeze | light breeze | light breeze | breezy | breezy | breezy | windy | windy | windy | breezy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 22 | breezy |
| Feb | 20 | light breeze |
| Mar | 18 | light breeze |
| Apr | 17 | light breeze |
| May | 19 | light breeze |
| Jun | 21 | breezy |
| Jul | 24 | breezy |
| Aug | 27 | breezy |
| Sep | 30 | windy |
| Oct | 31 | windy |
| Nov | 29 | windy |
| Dec | 27 | breezy |
Hazard calendar for Ilha Grande
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Ilha Grande's monsoon runs February–May, when most of the year's rain falls.
Best time to visit Ilha Grande
To characterize how pleasant the weather is in Ilha Grande throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid December, Ilha Grande is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
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 time of year to visit Ilha Grande for general outdoor tourist activities is from late June to mid December, with a peak score in the last week of September.
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) | 4.3 | 3.9 | 3.7 | 3.5 | 4.3 | 5.5 | 6.5 | 7.0 | 7.2 | 7.1 | 6.8 | 5.9 |
| Rating | fair | fair | fair | fair | fair | good | good | good | good | good | good | good |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 4.3 | fair |
| Feb | 3.9 | fair |
| Mar | 3.7 | fair |
| Apr | 3.5 | fair |
| May | 4.3 | fair |
| Jun | 5.5 | good |
| Jul | 6.5 | good |
| Aug | 7.0 | good |
| Sep | 7.2 | good |
| Oct | 7.1 | good |
| Nov | 6.8 | good |
| Dec | 5.9 | good |
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 Ilha Grande for hot-weather activities is from late June to mid December, with a peak score in the first week of September.
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 Ilha Grande, 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.
Ilha Grande packs about the same all year — highs hold near 30°C. Across the year the things worth having are light clothes, sun protection, a windbreaker and rain gear.
In August, Ilha Grande sees daytime highs around 30°C and nights near 26°C. Pack light clothes and sun protection. Worth having: a windbreaker.
Sea temperature near Ilha Grande
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 21 km away) is warmest in May at about 29°C and coldest in September near 27°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) | 28 | 28 | 29 | 29 | 29 | 29 | 28 | 27 | 27 | 27 | 28 | 28 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm | Warm | Warm | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Tropical |
| Feb | 28 | Tropical |
| Mar | 29 | Tropical |
| Apr | 29 | Tropical |
| May | 29 | Tropical |
| Jun | 29 | Tropical |
| Jul | 28 | Warm |
| Aug | 27 | Warm |
| Sep | 27 | Warm |
| Oct | 27 | Warm |
| Nov | 28 | Warm |
| Dec | 28 | Tropical |
UV index (midday) in Ilha Grande 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 Ilha Grande peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 10 (extreme).
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) | 13 | 14 | 16 | 14 | 12 | 10 | 10 | 10 | 12 | 12 | 11 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 14 | Extreme |
| Mar | 16 | Extreme |
| Apr | 14 | Extreme |
| May | 12 | Extreme |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 11 | Extreme |
| Dec | 11 | Extreme |
Average hourly UV index in Ilha Grande
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 March the burn window is concentrated in the middle of the day: about 8.5 hours a day reach index 3 (protection recommended), and 6.5 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) | 8 | 8 | 8.5 | 8 | 8 | 7.5 | 7.5 | 7.5 | 8 | 8 | 8 | 8 |
| UV ≥ 6 (h/day) | 6 | 6.5 | 6.5 | 6.5 | 6 | 5 | 5 | 5 | 6 | 6 | 5.5 | 5.5 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 8 | 6 |
| Feb | 8 | 6.5 |
| Mar | 8.5 | 6.5 |
| Apr | 8 | 6.5 |
| May | 8 | 6 |
| Jun | 7.5 | 5 |
| Jul | 7.5 | 5 |
| Aug | 7.5 | 5 |
| Sep | 8 | 6 |
| Oct | 8 | 6 |
| Nov | 8 | 5.5 |
| Dec | 8 | 5.5 |
Air quality in Ilha Grande 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 Ilha Grande is worst in December — around 18 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (August, 6 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) | 12 | 15 | 13 | 11 | 8 | 7 | 9 | 6 | 7 | 10 | 16 | 18 |
| Level | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Moderate |
| Feb | 15 | Moderate |
| Mar | 13 | Moderate |
| Apr | 11 | Good |
| May | 8 | Good |
| Jun | 7 | Good |
| Jul | 9 | Good |
| Aug | 6 | Good |
| Sep | 7 | Good |
| Oct | 10 | Good |
| Nov | 16 | Moderate |
| Dec | 18 | Moderate |
Growing season
Ilha Grande 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. Ilha Grande banks about 6,295 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around November.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 527 | 468 | 516 | 503 | 536 | 525 | 542 | 542 | 523 | 542 | 528 | 543 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 527 |
| Feb | 468 |
| Mar | 516 |
| Apr | 503 |
| May | 536 |
| Jun | 525 |
| Jul | 542 |
| Aug | 542 |
| Sep | 523 |
| Oct | 542 |
| Nov | 528 |
| Dec | 543 |
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.
Ilha Grande receives about 6.0 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 5.0 and 7.1 kWh/m².
The brighter stretch of the year lasts 5.2 months, from around Jul 24 to Dec 28. The brightest month is October, averaging about 7.0 kWh/m² (intense).
The dimmest month is April, down near 5.0 kWh/m² — roughly 29% less than the October peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.7 | 5.5 | 5.3 | 5.0 | 5.3 | 5.4 | 5.8 | 6.5 | 7.0 | 7.0 | 6.7 | 6.2 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 5.7 | Bright |
| Feb | 5.5 | Bright |
| Mar | 5.3 | Bright |
| Apr | 5.0 | Bright |
| May | 5.3 | Bright |
| Jun | 5.4 | Bright |
| Jul | 5.8 | Bright |
| Aug | 6.5 | Intense |
| Sep | 7.0 | Intense |
| Oct | 7.0 | Intense |
| Nov | 6.7 | Intense |
| Dec | 6.2 | Intense |
Where is Ilha Grande?
Ilha Grande sits at 2.9°S, 41.8°W, 0 m above sea level, in Brazil. The nearest listed city is Parnaíba, 7.0 km away.
Topography around Ilha Grande
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ilha Grande.
Within 3 km, the terrain around Ilha Grande has only modest variations in elevation — a maximum elevation change of 24 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 45 m; within 80 km, large variations in elevation — a maximum elevation change of 656 m.
The land around Ilha Grande is covered by grassland (49%) and trees (22%) within 3 km, grassland (32%) within 16 km, and trees (38%) and water (35%) within 80 km.
Brazil travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / N
- 127 / 220 V · 60 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $10,713
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 19.3
- per 100k, 2023
- Road deaths
- 16
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 482
- 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 Ilha Grande (-2.8521°, -41.8169°, elevation 0 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. 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).