Climate and average weather in Iaçu
In Iaçu, the weather is humid, hot, fairly dry, and partly cloudy and remarkably steady, with daytime highs holding near hot levels all year. The wettest stretch peaks around January.
Over the course of the year, the temperature in Iaçu typically varies from 18°C to 33°C, and is rarely below 16°C or above 36°C. February is the hottest month of the year, while July is the coldest.
Based on the travel score, the best time of year to visit Iaçu for warm-weather activities is from mid May to late September.
- Hottest
- Feb
- 33°
- Coldest
- Jul
- 18°
- Wettest
- Jan
- 56 mm
- Driest
- Sep
- 11 mm
- Rain / yr
- 380 mm
- 66 wet days
- Daylight
- 11.2–12.8 h
- shortest–longest
- Elevation
- 240 m
- 12.8°S
- Clearest
- Oct
- 55% cloud
Iaçu is human settlement in Brazil.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Iaçu 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 mid May to late September.
Temperature through the year
Daily average highs and lows in Iaçu, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Iaçu stay fairly even through the year, without a distinct hot or cool season. The warmest month is February, with an average high of 33°C and low of 22°C; the coolest is July, with an average low of 18°C and high of 28°C.
Days typically run about 10°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 33 | 33 | 31 | 30 | 29 | 28 | 29 | 30 | 32 | 32 | 32 |
| Avg low (°C) | 22 | 22 | 22 | 22 | 21 | 19 | 18 | 18 | 19 | 21 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 32 | 22 |
| Feb | 33 | 22 |
| Mar | 33 | 22 |
| Apr | 31 | 22 |
| May | 30 | 21 |
| Jun | 29 | 19 |
| Jul | 28 | 18 |
| Aug | 29 | 18 |
| Sep | 30 | 19 |
| Oct | 32 | 21 |
| Nov | 32 | 22 |
| Dec | 32 | 22 |
How hot and cold Iaçu 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, Iaçu feels like about 35°C (around March 6). About 218 days a year carry some heat stress, peaking in March.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 35 | 35 | 35 | 34 | 31 | 29 | 29 | 29 | 31 | 33 | 33 | 34 |
| Air high (°C) | 32 | 33 | 33 | 31 | 30 | 29 | 28 | 29 | 30 | 32 | 32 | 32 |
| Feels-like low (°C) | 22 | 22 | 22 | 22 | 21 | 19 | 18 | 18 | 19 | 21 | 21 | 22 |
| Air low (°C) | 22 | 22 | 22 | 22 | 21 | 19 | 18 | 18 | 19 | 21 | 22 | 22 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 35 | 32 | 22 | 22 |
| Feb | 35 | 33 | 22 | 22 |
| Mar | 35 | 33 | 22 | 22 |
| Apr | 34 | 31 | 22 | 22 |
| May | 31 | 30 | 21 | 21 |
| Jun | 29 | 29 | 19 | 19 |
| Jul | 29 | 28 | 18 | 18 |
| Aug | 29 | 29 | 18 | 18 |
| Sep | 31 | 30 | 19 | 19 |
| Oct | 33 | 32 | 21 | 21 |
| Nov | 33 | 32 | 21 | 22 |
| Dec | 34 | 32 | 22 | 22 |
Average hourly temperature in Iaçu
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 February afternoons, near 33°C, and coldest before dawn in July, near 18°C.
Iaçu 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 | 32° / 22° | 56 | 6.6 | 12.7 | 4.0 |
| Feb | 33° / 22° | 37 | 6.1 | 12.4 | 3.8 |
| Mar | 33° / 22° | 53 | 8.1 | 12.1 | 3.9 |
| Apr | 31° / 22° | 37 | 7.1 | 11.7 | 4.5 |
| May | 30° / 21° | 18 | 5.1 | 11.4 | 5.4 |
| Jun | 29° / 19° | 14 | 4.6 | 11.3 | 6.2 |
| Jul | 28° / 18° | 14 | 4.8 | 11.3 | 6.6 |
| Aug | 29° / 18° | 11 | 3.7 | 11.6 | 6.3 |
| Sep | 30° / 19° | 11 | 2.5 | 11.9 | 5.6 |
| Oct | 32° / 21° | 21 | 4 | 12.3 | 4.7 |
| Nov | 32° / 22° | 53 | 7.1 | 12.6 | 4.3 |
| Dec | 32° / 22° | 55 | 6.6 | 12.7 | 4.2 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Iaçu gets about 380 mm of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.
The wetter season lasts 6.1 months, from around Nov 3 to May 6, peaking in March at about 27% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Sep 8.
January is the wettest month by volume, with 56 mm over about 7 wet days; September is the driest, with 11 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 22 | 22 | 25 | 24 | 17 | 15 | 15 | 11 | 9 | 13 | 23 | 21 |
| Rain days | 7 | 6 | 8 | 7 | 5 | 5 | 5 | 4 | 3 | 4 | 7 | 7 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 22 | 7 |
| Feb | 22 | 6 |
| Mar | 25 | 8 |
| Apr | 24 | 7 |
| May | 17 | 5 |
| Jun | 15 | 5 |
| Jul | 15 | 5 |
| Aug | 11 | 4 |
| Sep | 9 | 3 |
| Oct | 13 | 4 |
| Nov | 23 | 7 |
| Dec | 21 | 7 |
Monthly rainfall
Over a full year, Iaçu collects about 380 mm of rain across 66 wet days — roughly 32 mm in an average month.
It doesn’t fall evenly. January is the wettest month with 56 mm, while September is the driest at just 11 mm. The three wettest months alone bring about 43% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 56 | 37 | 53 | 37 | 18 | 14 | 14 | 11 | 11 | 21 | 53 | 55 |
| Rain days | 7 | 6 | 8 | 7 | 5 | 5 | 5 | 4 | 3 | 4 | 7 | 7 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 56 | 7 |
| Feb | 37 | 6 |
| Mar | 53 | 8 |
| Apr | 37 | 7 |
| May | 18 | 5 |
| Jun | 14 | 5 |
| Jul | 14 | 5 |
| Aug | 11 | 4 |
| Sep | 11 | 3 |
| Oct | 21 | 4 |
| Nov | 53 | 7 |
| Dec | 55 | 7 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Iaçu, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around August 30 and lasts for 2.1 months, ending around November 1. The clearest month is October, when the sky is clear, mostly clear, or partly cloudy 56% of the time on average.
The cloudier part of the year begins around November 2 and lasts for 2.6 months, ending around January 20. The cloudiest month is November, when it is overcast or mostly cloudy 58% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 50 | 55 | 54 | 51 | 46 | 48 | 48 | 44 | 56 | 56 | 42 | 45 |
| Cloudier (%) | 50 | 45 | 46 | 49 | 54 | 52 | 52 | 56 | 44 | 44 | 58 | 55 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 50 | 50 |
| Feb | 55 | 45 |
| Mar | 54 | 46 |
| Apr | 51 | 49 |
| May | 46 | 54 |
| Jun | 48 | 52 |
| Jul | 48 | 52 |
| Aug | 44 | 56 |
| Sep | 56 | 44 |
| Oct | 56 | 44 |
| Nov | 42 | 58 |
| Dec | 45 | 55 |
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 December 19, brings about 12 h 48 min of light; the shortest, around June 19, only 11 h 12 min — a swing of roughly 1 h 36 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.7 | 12.4 | 12.1 | 11.7 | 11.4 | 11.3 | 11.3 | 11.6 | 11.9 | 12.3 | 12.6 | 12.7 |
| Sunrise (AM) | 5:30 | 5:43 | 5:48 | 5:50 | 5:55 | 6:03 | 6:07 | 5:58 | 5:37 | 5:17 | 5:08 | 5:15 |
| Sunset (PM) | 6:10 | 6:08 | 5:53 | 5:33 | 5:19 | 5:19 | 5:26 | 5:32 | 5:33 | 5:35 | 5:44 | 5:59 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 12.7 | 5:30 | 6:10 |
| Feb | 12.4 | 5:43 | 6:08 |
| Mar | 12.1 | 5:48 | 5:53 |
| Apr | 11.7 | 5:50 | 5:33 |
| May | 11.4 | 5:55 | 5:19 |
| Jun | 11.3 | 6:03 | 5:19 |
| Jul | 11.3 | 6:07 | 5:26 |
| Aug | 11.6 | 5:58 | 5:32 |
| Sep | 11.9 | 5:37 | 5:33 |
| Oct | 12.3 | 5:17 | 5:35 |
| Nov | 12.6 | 5:08 | 5:44 |
| Dec | 12.7 | 5:15 | 5:59 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Iaçu averages about 7 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 4 and 10 days.
The sunnier stretch runs 2.3 months, from around Sep 4 to Nov 13. The sunniest month is October, with roughly 10 sunny days (mixed).
The greyest month is August, down near 5 sunny days — about 48% fewer than the October peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 8 | 8 | 8 | 7 | 6 | 5 | 5 | 5 | 8 | 10 | 7 | 7 |
| Sky | Mixed | Mixed | Mixed | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Mixed | Mixed | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 8 | Mixed |
| Feb | 8 | Mixed |
| Mar | 8 | Mixed |
| Apr | 7 | Gloomy |
| May | 6 | Gloomy |
| Jun | 5 | Gloomy |
| Jul | 5 | Gloomy |
| Aug | 5 | Gloomy |
| Sep | 8 | Mixed |
| Oct | 10 | Mixed |
| Nov | 7 | Gloomy |
| Dec | 7 | Gloomy |
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 Iaçu, how humid it feels changes noticeably over the year.
The more humid part of the year lasts 8.2 months, from around October 2 to June 9. The muggiest month is January, when the air feels humid, muggy or worse about 100% of the time.
The most comfortable stretch runs from around June 10 to October 1, and August is the most comfortable month — the air is dry or comfortable 17% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 2 | 5 | 12 | 16 | 10 | 2 | 0 | 0 |
| Humid (%) | 9 | 8 | 5 | 7 | 27 | 57 | 75 | 72 | 68 | 51 | 22 | 14 |
| Muggy (%) | 77 | 80 | 75 | 77 | 68 | 38 | 13 | 11 | 22 | 45 | 69 | 73 |
| Oppressive (%) | 14 | 12 | 20 | 16 | 4 | 0 | 0 | 0 | 0 | 2 | 8 | 13 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| Jan | 0 | 0 | 9 | 77 | 14 |
| Feb | 0 | 0 | 8 | 80 | 12 |
| Mar | 0 | 0 | 5 | 75 | 20 |
| Apr | 0 | 0 | 7 | 77 | 16 |
| May | 0 | 2 | 27 | 68 | 4 |
| Jun | 0 | 5 | 57 | 38 | 0 |
| Jul | 0 | 12 | 75 | 13 | 0 |
| Aug | 1 | 16 | 72 | 11 | 0 |
| Sep | 0 | 10 | 68 | 22 | 0 |
| Oct | 0 | 2 | 51 | 45 | 2 |
| Nov | 0 | 0 | 22 | 69 | 8 |
| Dec | 0 | 0 | 14 | 73 | 13 |
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.
Wind in Iaçu is steady company: average speeds sit near 9 km/h — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 9 | 9 | 9 | 8 | 8 | 9 | 9 | 10 | 11 | 11 | 10 | 9 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 9 | calm |
| Feb | 9 | calm |
| Mar | 9 | calm |
| Apr | 8 | calm |
| May | 8 | calm |
| Jun | 9 | calm |
| Jul | 9 | calm |
| Aug | 10 | calm |
| Sep | 11 | calm |
| Oct | 11 | calm |
| Nov | 10 | calm |
| Dec | 9 | calm |
Best time to visit Iaçu
To characterize how pleasant the weather is in Iaçu throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late May, Iaçu 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 time of year to visit Iaçu for general outdoor tourist activities is from mid May to late September, with a peak score in the last week of July.
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) | 4.0 | 3.8 | 3.9 | 4.5 | 5.4 | 6.2 | 6.5 | 6.3 | 5.6 | 4.7 | 4.3 | 4.2 |
| Rating | fair | fair | fair | fair | fair | good | good | good | good | fair | fair | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 4.0 | fair |
| Feb | 3.8 | fair |
| Mar | 3.9 | fair |
| Apr | 4.5 | fair |
| May | 5.4 | fair |
| Jun | 6.2 | good |
| Jul | 6.5 | good |
| Aug | 6.3 | good |
| Sep | 5.6 | good |
| Oct | 4.7 | fair |
| Nov | 4.3 | fair |
| Dec | 4.2 | fair |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, Iaçu suits hot-weather activities for most of the year, 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 Iaçu, 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.
Iaçu packs about the same all year — highs hold near 33°C. Across the year the things worth having are light clothes and sun protection.
In February, Iaçu sees daytime highs around 33°C and nights near 22°C. Pack light clothes and sun protection. About 6 days see rain.
UV index (midday) in Iaçu 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 Iaçu peaks around February 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 9 (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) | 14 | 15 | 14 | 12 | 9 | 9 | 9 | 10 | 11 | 13 | 13 | 12 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 15 | Extreme |
| Mar | 14 | Extreme |
| Apr | 12 | Extreme |
| May | 9 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 10 | Extreme |
| Sep | 11 | Extreme |
| Oct | 13 | Extreme |
| Nov | 13 | Extreme |
| Dec | 12 | Extreme |
Average hourly UV index in Iaçu
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 February the burn window is concentrated in the middle of the day: about 8.5 hours a day reach index 3 (protection recommended), and 7 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) | 8.5 | 8.5 | 8 | 7.5 | 7 | 6.5 | 7 | 7.5 | 7.5 | 8 | 8.5 | 8 |
| UV ≥ 6 (h/day) | 6.5 | 7 | 6.5 | 6 | 4.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 6 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 8.5 | 6.5 |
| Feb | 8.5 | 7 |
| Mar | 8 | 6.5 |
| Apr | 7.5 | 6 |
| May | 7 | 4.5 |
| Jun | 6.5 | 4 |
| Jul | 7 | 4.5 |
| Aug | 7.5 | 5 |
| Sep | 7.5 | 5.5 |
| Oct | 8 | 6 |
| Nov | 8.5 | 6.5 |
| Dec | 8 | 6 |
Growing season
Iaçu 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. Iaçu banks about 5,763 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around February.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 534 | 492 | 542 | 502 | 476 | 420 | 410 | 418 | 447 | 503 | 497 | 522 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 534 |
| Feb | 492 |
| Mar | 542 |
| Apr | 502 |
| May | 476 |
| Jun | 420 |
| Jul | 410 |
| Aug | 418 |
| Sep | 447 |
| Oct | 503 |
| Nov | 497 |
| Dec | 522 |
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.
Iaçu receives about 5.0 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.5 and 6.1 kWh/m².
The brighter stretch of the year lasts 6.8 months, from around Sep 15 to Apr 8. The brightest month is December, averaging about 6.0 kWh/m² (bright).
The dimmest month is June, down near 3.6 kWh/m² — roughly 40% less than the December peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.0 | 6.0 | 5.6 | 4.8 | 4.0 | 3.5 | 3.7 | 4.2 | 5.0 | 5.7 | 5.6 | 6.0 |
| Level | Intense | Intense | Bright | Bright | Moderate | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 6.0 | Intense |
| Feb | 6.0 | Intense |
| Mar | 5.6 | Bright |
| Apr | 4.8 | Bright |
| May | 4.0 | Moderate |
| Jun | 3.5 | Moderate |
| Jul | 3.7 | Moderate |
| Aug | 4.2 | Bright |
| Sep | 5.0 | Bright |
| Oct | 5.7 | Bright |
| Nov | 5.6 | Bright |
| Dec | 6.0 | Bright |
Where is Iaçu?
Iaçu sits at 12.8°S, 40.2°W, 240 m above sea level, in Brazil. The nearest listed city is Itaberaba, 29 km away.
Topography around Iaçu
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Iaçu.
Within 3 km, the terrain around Iaçu has only modest variations in elevation — a maximum elevation change of 228 m around an average of 251 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 598 m; within 80 km, large variations in elevation — a maximum elevation change of 928 m.
The land around Iaçu is covered by grassland (61%) within 3 km, grassland (67%) within 16 km, and grassland (58%) and trees (27%) 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 Iaçu (-12.7672°, -40.2117°, elevation 240 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).