Imperatriz climate — normals and trends
Imperatriz (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.9 °C and it receives 1,172 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 September (28.9 °C on average) and the coldest is February (25.6 °C). Rainfall peaks in March.
Imperatriz averages 0 frost days, 268 hot days (≥ 30 °C) and 161 rainy days per year.
No statistically significant temperature trend emerges for Imperatriz between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.
The hottest day of the period reached 39.8 °C (on 26 October 1958) and the coldest 16.2 °C (on 28 July 2020).
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
ImperatrizMaranhão
- coords
- -5.53°, -47.49°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.9°C
Average daily high
31.8°C
Average daily low
22.9°C
Annual rainfall
1,172mm
Sunshine / day
10.5h
Mean relative humidity
73%
Average peak wind
11.4km/h
Seasonal range
3.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
268 d/yr
Rainy days (≥ 1 mm)
161 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.3 °C
Average feels-like low
26.3 °C
Average peak gust
29.7 km/h
Tropical nights (≥ 20 °C)
360 d/yr
Solar radiation
19.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
No clear trend over this period
Over a short window, year-to-year swings outweigh the climate signal. Try 86 years.
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
39.8 °C
26 October 1958
Coldest day
16.2 °C
28 July 2020
Wettest day
175 mm
4 April 1978
Windiest day
26.9 km/h
4 August 1996
Strongest gust
57.6 km/h
7 September 1940
Hottest feels-like
44.2 °C
28 October 2018
Coldest feels-like
16.6 °C
28 July 2020
Sunniest day
12.2 h
28 January 2015
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 | 29.9 °C | +0.1 °C | 383 mm | +174 mm |
| Feb | 30.4 °C | +0.8 °C | 218 mm | +15 mm |
| Mar | 30.7 °C | +1.1 °C | 253 mm | +39 mm |
| Apr | 31.6 °C | +1.6 °C | 84 mm | -67 mm |
| May | 32.6 °C | +1.8 °C | 17 mm | -48 mm |
| Jun | 32.9 °C | +0.8 °C | 17 mm | +4 mm |
| Jul | 33.8 °C | +0.6 °C | 2 mm | -5 mm |
| Aug | 34.3 °C | -0.1 °C | 3 mm | -2 mm |
| Sep | 35.4 °C | +0.7 °C | 3 mm | -10 mm |
| Oct | 34.4 °C | +0.5 °C | 18 mm | -25 mm |
| Nov | 33.1 °C | +0.7 °C | 53 mm | -43 mm |
| Dec | 30.3 °C | -0.6 °C | 219 mm | +66 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 Imperatriz?
Imperatriz has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.9 °C and it receives 1,172 mm of precipitation per year.
What is the hottest day ever recorded in Imperatriz?
The hottest day measured in Imperatriz between 1940 and 2025 was 26 October 1958, reaching 39.8 °C.
What is the coldest day in Imperatriz?
The coldest day measured in Imperatriz between 1940 and 2025 was 28 July 2020, at 16.2 °C.
Does it snow in Imperatriz?
Almost never: Imperatriz sees virtually no snow, with about 0 frost days per year.
Has the climate of Imperatriz warmed?
Between 1940 and 2025, no statistically significant temperature trend emerges in Imperatriz.
What is the wettest day in Imperatriz?
The wettest day measured in Imperatriz between 1940 and 2025 was 4 April 1978, with 175 mm of rain in 24 hours.
What was the windiest day in Imperatriz?
The windiest day measured in Imperatriz between 1940 and 2025 was 4 August 1996, with winds reaching 26.9 km/h.
What is the warmest month in Imperatriz?
The warmest month in Imperatriz is September (28.9 °C on average); the coldest is February (25.6 °C).
How much does it rain in Imperatriz?
Imperatriz receives on average 1,172 mm of precipitation per year, spread over about 161 rainy days.
Is it sunny in Imperatriz?
Imperatriz gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.
Are there tropical nights in Imperatriz?
Yes: Imperatriz has on average 360 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Imperatriz?
In Imperatriz, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 28 October 2018, and the lowest was 16.6 °C on 28 July 2020.
Compare Imperatriz with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Imperatriz