Iaçu climate — normals and trends
Iaçu (Brazil) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 24.9 °C and it receives 412 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is February (26.5 °C on average) and the coldest is July (22.4 °C). Rainfall peaks in November.
Iaçu averages 0 frost days, 200 hot days (≥ 30 °C) and 75 rainy days per year.
Iaçu has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The hottest day of the period reached 39.5 °C (on 23 October 1954) and the coldest 11.6 °C (on 10 July 1963).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
IaçuEstado de Bahia
- coords
- -12.77°, -40.21°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
24.9°C
Average daily high
30.4°C
Average daily low
20.5°C
Annual rainfall
412mm
Sunshine / day
10.4h
Mean relative humidity
69%
Average peak wind
14.7km/h
Seasonal range
4.1°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
200 d/yr
Rainy days (≥ 1 mm)
75 d/yr
Annual snowfall
0.0 cm
Average feels-like high
32.3 °C
Average feels-like low
22.8 °C
Average peak gust
31.6 km/h
Tropical nights (≥ 20 °C)
239 d/yr
Solar radiation
18.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.26 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
39.5 °C
23 October 1954
Coldest day
11.6 °C
10 July 1963
Wettest day
113 mm
21 March 1988
Windiest day
27.3 km/h
13 November 1985
Strongest gust
60.1 km/h
13 November 1985
Hottest feels-like
43.2 °C
26 November 2015
Coldest feels-like
10.5 °C
10 July 1963
Sunniest day
12.8 h
16 December 1941
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 32.5 °C | +0.5 °C | 241 mm | +186 mm |
| Feb | 32.6 °C | +0.4 °C | 20 mm | -23 mm |
| Mar | 33.7 °C | +1.8 °C | 13 mm | -48 mm |
| Apr | 33.2 °C | +2.3 °C | 33 mm | -8 mm |
| May | 29.6 °C | +0.1 °C | 29 mm | +10 mm |
| Jun | 29.0 °C | +0.8 °C | 11 mm | -3 mm |
| Jul | 27.6 °C | 0.0 °C | 12 mm | -2 mm |
| Aug | 29.1 °C | +0.7 °C | 9 mm | -2 mm |
| Sep | 29.7 °C | -0.3 °C | 11 mm | -1 mm |
| Oct | 30.5 °C | -1.1 °C | 17 mm | -6 mm |
| Nov | 31.8 °C | +0.3 °C | 47 mm | -15 mm |
| Dec | 32.5 °C | +1.0 °C | 14 mm | -46 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Iaçu?
Iaçu has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 24.9 °C and it receives 412 mm of precipitation per year.
What is the hottest day ever recorded in Iaçu?
The hottest day measured in Iaçu between 1940 and 2025 was 23 October 1954, reaching 39.5 °C.
What is the coldest day in Iaçu?
The coldest day measured in Iaçu between 1940 and 2025 was 10 July 1963, at 11.6 °C.
Does it snow in Iaçu?
Almost never: Iaçu sees virtually no snow, with about 0 frost days per year.
Has the climate of Iaçu warmed?
Yes: Iaçu warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Iaçu?
The wettest day measured in Iaçu between 1940 and 2025 was 21 March 1988, with 113 mm of rain in 24 hours.
What was the windiest day in Iaçu?
The windiest day measured in Iaçu between 1940 and 2025 was 13 November 1985, with winds reaching 27.3 km/h.
What is the warmest month in Iaçu?
The warmest month in Iaçu is February (26.5 °C on average); the coldest is July (22.4 °C).
How much does it rain in Iaçu?
Iaçu receives on average 412 mm of precipitation per year, spread over about 75 rainy days.
Is it sunny in Iaçu?
Iaçu gets on average 10.4 hours of sunshine per day, roughly 3,796 hours per year over 1940-2025.
Are there tropical nights in Iaçu?
Yes: Iaçu has on average 239 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Iaçu?
In Iaçu, between 1940 and 2025, the highest apparent temperature reached 43.2 °C on 26 November 2015, and the lowest was 10.5 °C on 10 July 1963.
Compare Iaçu with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Iaçu