Barão de Grajaú climate — normals and trends
Barão de Grajaú (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.8 °C and it receives 965 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 October (30.3 °C on average) and the coldest is March (25.9 °C). Rainfall peaks in March.
Barão de Grajaú averages 0 frost days, 305 hot days (≥ 30 °C) and 120 rainy days per year.
Barão de Grajaú has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 40.6 °C (on 20 November 2005) and the coldest 18.1 °C (on 27 July 1986).
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
Barão de GrajaúMaranhão
- coords
- -6.76°, -43.02°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.8°C
Average daily high
32.7°C
Average daily low
23.6°C
Annual rainfall
965mm
Sunshine / day
10.7h
Mean relative humidity
62%
Average peak wind
13.9km/h
Seasonal range
4.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
305 d/yr
Rainy days (≥ 1 mm)
120 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.2 °C
Average feels-like low
25.5 °C
Average peak gust
33.2 km/h
Tropical nights (≥ 20 °C)
363 d/yr
Solar radiation
20.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.18 · 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
40.6 °C
20 November 2005
Coldest day
18.1 °C
27 July 1986
Wettest day
137 mm
19 February 2015
Windiest day
30.8 km/h
4 July 2017
Strongest gust
62.3 km/h
17 July 1947
Hottest feels-like
44.9 °C
20 October 2018
Coldest feels-like
15.4 °C
31 July 1956
Sunniest day
12.3 h
25 November 1958
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 | 30.9 °C | -0.1 °C | 200 mm | +12 mm |
| Feb | 32.1 °C | +1.6 °C | 68 mm | -121 mm |
| Mar | 32.0 °C | +1.7 °C | 58 mm | -149 mm |
| Apr | 33.5 °C | +2.8 °C | 33 mm | -96 mm |
| May | 34.2 °C | +2.4 °C | 2 mm | -34 mm |
| Jun | 34.4 °C | +1.8 °C | 0 mm | -4 mm |
| Jul | 35.2 °C | +2.1 °C | 0 mm | -2 mm |
| Aug | 35.9 °C | +1.4 °C | 2 mm | +1 mm |
| Sep | 37.1 °C | +1.3 °C | 0 mm | -5 mm |
| Oct | 37.1 °C | +1.3 °C | 3 mm | -19 mm |
| Nov | 35.8 °C | +1.6 °C | 12 mm | -53 mm |
| Dec | 32.4 °C | -0.1 °C | 56 mm | -62 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 Barão de Grajaú?
Barão de Grajaú has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.8 °C and it receives 965 mm of precipitation per year.
What is the hottest day ever recorded in Barão de Grajaú?
The hottest day measured in Barão de Grajaú between 1940 and 2025 was 20 November 2005, reaching 40.6 °C.
What is the coldest day in Barão de Grajaú?
The coldest day measured in Barão de Grajaú between 1940 and 2025 was 27 July 1986, at 18.1 °C.
Does it snow in Barão de Grajaú?
Almost never: Barão de Grajaú sees virtually no snow, with about 0 frost days per year.
Has the climate of Barão de Grajaú warmed?
Yes: Barão de Grajaú warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Barão de Grajaú?
The wettest day measured in Barão de Grajaú between 1940 and 2025 was 19 February 2015, with 137 mm of rain in 24 hours.
What was the windiest day in Barão de Grajaú?
The windiest day measured in Barão de Grajaú between 1940 and 2025 was 4 July 2017, with winds reaching 30.8 km/h.
What is the warmest month in Barão de Grajaú?
The warmest month in Barão de Grajaú is October (30.3 °C on average); the coldest is March (25.9 °C).
How much does it rain in Barão de Grajaú?
Barão de Grajaú receives on average 965 mm of precipitation per year, spread over about 120 rainy days.
Is it sunny in Barão de Grajaú?
Barão de Grajaú gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.
Are there tropical nights in Barão de Grajaú?
Yes: Barão de Grajaú has on average 363 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Barão de Grajaú?
In Barão de Grajaú, between 1940 and 2025, the highest apparent temperature reached 44.9 °C on 20 October 2018, and the lowest was 15.4 °C on 31 July 1956.
Compare Barão de Grajaú with another city
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Nearby cities
The climate around Barão de Grajaú