São João Batista climate — normals and trends
São João Batista (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.3 °C and it receives 1,806 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 (28.3 °C on average) and the coldest is March (26.4 °C). Rainfall peaks in March.
São João Batista averages 0 frost days, 266 hot days (≥ 30 °C) and 199 rainy days per year.
São João Batista 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 37.9 °C (on 28 September 1944) and the coldest 21.1 °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
São João BatistaMaranhão
- coords
- -2.96°, -44.81°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.3°C
Average daily high
31.2°C
Average daily low
24.6°C
Annual rainfall
1,806mm
Sunshine / day
10.6h
Mean relative humidity
79%
Average peak wind
16.1km/h
Seasonal range
1.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
266 d/yr
Rainy days (≥ 1 mm)
199 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.8 °C
Average feels-like low
28.8 °C
Average peak gust
34.6 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
18.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.48 · 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
37.9 °C
28 September 1944
Coldest day
21.1 °C
4 July 1974
Wettest day
285 mm
30 April 2006
Windiest day
30.4 km/h
9 November 1965
Strongest gust
58.0 km/h
28 November 2000
Hottest feels-like
42.2 °C
25 October 2017
Coldest feels-like
21.3 °C
4 July 1974
Sunniest day
12.0 h
2 January 1940
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 | +0.5 °C | 401 mm | +172 mm |
| Feb | 30.2 °C | +0.3 °C | 288 mm | +4 mm |
| Mar | 30.7 °C | +1.0 °C | 370 mm | +2 mm |
| Apr | 31.0 °C | +1.1 °C | 274 mm | -76 mm |
| May | 31.3 °C | +1.0 °C | 121 mm | -111 mm |
| Jun | 31.0 °C | +0.6 °C | 76 mm | -30 mm |
| Jul | 31.3 °C | +0.6 °C | 70 mm | +9 mm |
| Aug | 32.6 °C | +0.4 °C | 16 mm | -7 mm |
| Sep | 34.4 °C | +1.3 °C | 4 mm | -10 mm |
| Oct | 34.5 °C | +1.3 °C | 8 mm | -8 mm |
| Nov | 33.2 °C | +0.2 °C | 10 mm | -18 mm |
| Dec | 32.0 °C | +0.1 °C | 68 mm | -26 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 São João Batista?
São João Batista has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.3 °C and it receives 1,806 mm of precipitation per year.
What is the hottest day ever recorded in São João Batista?
The hottest day measured in São João Batista between 1940 and 2025 was 28 September 1944, reaching 37.9 °C.
What is the coldest day in São João Batista?
The coldest day measured in São João Batista between 1940 and 2025 was 4 July 1974, at 21.1 °C.
Does it snow in São João Batista?
Almost never: São João Batista sees virtually no snow, with about 0 frost days per year.
Has the climate of São João Batista warmed?
Yes: São João Batista warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in São João Batista?
The wettest day measured in São João Batista between 1940 and 2025 was 30 April 2006, with 285 mm of rain in 24 hours.
What was the windiest day in São João Batista?
The windiest day measured in São João Batista between 1940 and 2025 was 9 November 1965, with winds reaching 30.4 km/h.
What is the warmest month in São João Batista?
The warmest month in São João Batista is October (28.3 °C on average); the coldest is March (26.4 °C).
How much does it rain in São João Batista?
São João Batista receives on average 1,806 mm of precipitation per year, spread over about 199 rainy days.
Is it sunny in São João Batista?
São João Batista gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
Are there tropical nights in São João Batista?
Yes: São João Batista has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in São João Batista?
In São João Batista, between 1940 and 2025, the highest apparent temperature reached 42.2 °C on 25 October 2017, and the lowest was 21.3 °C on 4 July 1974.
Compare São João Batista with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around São João Batista