São João dos Patos climate — normals and trends
São João dos Patos (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.6 °C and it receives 1,162 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 March (25.0 °C). Rainfall peaks in March.
São João dos Patos averages 0 frost days, 256 hot days (≥ 30 °C) and 142 rainy days per year.
São João dos Patos has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The hottest day of the period reached 39.1 °C (on 25 September 2023) and the coldest 18.5 °C (on 7 August 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 dos PatosMaranhão
- coords
- -6.50°, -43.70°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.6°C
Average daily high
31.5°C
Average daily low
22.8°C
Annual rainfall
1,162mm
Sunshine / day
10.5h
Mean relative humidity
68%
Average peak wind
12.9km/h
Seasonal range
3.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
256 d/yr
Rainy days (≥ 1 mm)
142 d/yr
Annual snowfall
0.0 cm
Average feels-like high
34.9 °C
Average feels-like low
25.0 °C
Average peak gust
33.2 km/h
Tropical nights (≥ 20 °C)
363 d/yr
Solar radiation
19.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.19 · 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
39.1 °C
25 September 2023
Coldest day
18.5 °C
7 August 1974
Wettest day
119 mm
20 February 2022
Windiest day
28.7 km/h
15 August 1991
Strongest gust
63.4 km/h
15 August 1991
Hottest feels-like
44.2 °C
31 October 2012
Coldest feels-like
16.8 °C
31 July 1974
Sunniest day
12.1 h
25 November 2025
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 | +0.3 °C | 311 mm | +95 mm |
| Feb | 31.0 °C | +1.7 °C | 74 mm | -142 mm |
| Mar | 30.4 °C | +1.2 °C | 118 mm | -127 mm |
| Apr | 32.0 °C | +2.4 °C | 45 mm | -107 mm |
| May | 33.2 °C | +2.6 °C | 3 mm | -42 mm |
| Jun | 33.2 °C | +1.8 °C | 2 mm | -5 mm |
| Jul | 33.8 °C | +1.7 °C | 1 mm | -2 mm |
| Aug | 34.4 °C | +0.9 °C | 2 mm | +1 mm |
| Sep | 35.8 °C | +1.1 °C | 1 mm | -8 mm |
| Oct | 35.6 °C | +1.2 °C | 32 mm | -4 mm |
| Nov | 34.2 °C | +1.7 °C | 20 mm | -71 mm |
| Dec | 30.9 °C | -0.1 °C | 86 mm | -56 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 dos Patos?
São João dos Patos has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.6 °C and it receives 1,162 mm of precipitation per year.
What is the hottest day ever recorded in São João dos Patos?
The hottest day measured in São João dos Patos between 1940 and 2025 was 25 September 2023, reaching 39.1 °C.
What is the coldest day in São João dos Patos?
The coldest day measured in São João dos Patos between 1940 and 2025 was 7 August 1974, at 18.5 °C.
Does it snow in São João dos Patos?
Almost never: São João dos Patos sees virtually no snow, with about 0 frost days per year.
Has the climate of São João dos Patos warmed?
Yes: São João dos Patos warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in São João dos Patos?
The wettest day measured in São João dos Patos between 1940 and 2025 was 20 February 2022, with 119 mm of rain in 24 hours.
What was the windiest day in São João dos Patos?
The windiest day measured in São João dos Patos between 1940 and 2025 was 15 August 1991, with winds reaching 28.7 km/h.
What is the warmest month in São João dos Patos?
The warmest month in São João dos Patos is September (28.9 °C on average); the coldest is March (25.0 °C).
How much does it rain in São João dos Patos?
São João dos Patos receives on average 1,162 mm of precipitation per year, spread over about 142 rainy days.
Is it sunny in São João dos Patos?
São João dos Patos gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.
Are there tropical nights in São João dos Patos?
Yes: São João dos Patos has on average 363 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in São João dos Patos?
In São João dos Patos, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 31 October 2012, and the lowest was 16.8 °C on 31 July 1974.
Compare São João dos Patos with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around São João dos Patos