Icatu climate — normals and trends
Icatu (Brazil) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 26.9 °C and it receives 2,222 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 November (28.1 °C on average) and the coldest is March (25.8 °C). Rainfall peaks in March.
Icatu averages 0 frost days, 261 hot days (≥ 30 °C) and 208 rainy days per year.
Icatu has warmed by +1.1 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.1 °C (on 7 October 1947) and the coldest 19.8 °C (on 4 July 1974).
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
IcatuMaranhão
- coords
- -2.78°, -44.07°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.9°C
Average daily high
31.2°C
Average daily low
24.0°C
Annual rainfall
2,222mm
Sunshine / day
10.8h
Mean relative humidity
80%
Average peak wind
15.0km/h
Seasonal range
2.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
261 d/yr
Rainy days (≥ 1 mm)
208 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.9 °C
Average feels-like low
27.9 °C
Average peak gust
36.4 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
19.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.37 · 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
38.1 °C
7 October 1947
Coldest day
19.8 °C
4 July 1974
Wettest day
249 mm
1 April 1971
Windiest day
29.2 km/h
9 November 1965
Strongest gust
62.6 km/h
29 September 1989
Hottest feels-like
42.3 °C
11 January 2004
Coldest feels-like
19.7 °C
4 July 1974
Sunniest day
12.0 h
2 January 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 31.0 °C | +0.5 °C | 354 mm | +89 mm |
| Feb | 30.1 °C | +0.3 °C | 428 mm | +94 mm |
| Mar | 30.5 °C | +1.0 °C | 475 mm | +22 mm |
| Apr | 30.8 °C | +1.1 °C | 368 mm | -76 mm |
| May | 31.1 °C | +1.0 °C | 140 mm | -178 mm |
| Jun | 30.8 °C | +0.5 °C | 60 mm | -76 mm |
| Jul | 31.6 °C | +0.9 °C | 48 mm | -27 mm |
| Aug | 32.9 °C | +0.7 °C | 21 mm | -4 mm |
| Sep | 34.7 °C | +1.6 °C | 4 mm | -12 mm |
| Oct | 34.5 °C | +1.4 °C | 10 mm | -8 mm |
| Nov | 32.8 °C | -0.1 °C | 14 mm | -19 mm |
| Dec | 31.9 °C | -0.1 °C | 74 mm | -32 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 Icatu?
Icatu has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 26.9 °C and it receives 2,222 mm of precipitation per year.
What is the hottest day ever recorded in Icatu?
The hottest day measured in Icatu between 1940 and 2025 was 7 October 1947, reaching 38.1 °C.
What is the coldest day in Icatu?
The coldest day measured in Icatu between 1940 and 2025 was 4 July 1974, at 19.8 °C.
Does it snow in Icatu?
Almost never: Icatu sees virtually no snow, with about 0 frost days per year.
Has the climate of Icatu warmed?
Yes: Icatu warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Icatu?
The wettest day measured in Icatu between 1940 and 2025 was 1 April 1971, with 249 mm of rain in 24 hours.
What was the windiest day in Icatu?
The windiest day measured in Icatu between 1940 and 2025 was 9 November 1965, with winds reaching 29.2 km/h.
What is the warmest month in Icatu?
The warmest month in Icatu is November (28.1 °C on average); the coldest is March (25.8 °C).
How much does it rain in Icatu?
Icatu receives on average 2,222 mm of precipitation per year, spread over about 208 rainy days.
Is it sunny in Icatu?
Icatu gets on average 10.8 hours of sunshine per day, roughly 3,942 hours per year over 1940-2025.
Are there tropical nights in Icatu?
Yes: Icatu has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Icatu?
In Icatu, between 1940 and 2025, the highest apparent temperature reached 42.3 °C on 11 January 2004, and the lowest was 19.7 °C on 4 July 1974.
Compare Icatu with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Icatu