São João da Barra climate — normals and trends
São João da Barra (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 23.6 °C and it receives 973 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 February (25.6 °C on average) and the coldest is July (21.5 °C). Rainfall peaks in December.
São João da Barra averages 0 frost days, 2 hot days (≥ 30 °C) and 130 rainy days per year.
São João da Barra has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The hottest day of the period reached 31.7 °C (on 25 February 2019) and the coldest 15.1 °C (on 7 August 1983).
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 da BarraRio de Janeiro
- coords
- -21.64°, -41.05°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
23.6°C
Average daily high
25.4°C
Average daily low
22.1°C
Annual rainfall
973mm
Sunshine / day
10.2h
Mean relative humidity
82%
Average peak wind
23.9km/h
Seasonal range
4.1°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
0.0 cm
Average feels-like high
27.9 °C
Average feels-like low
23.3 °C
Average peak gust
36.2 km/h
Tropical nights (≥ 20 °C)
309 d/yr
Solar radiation
18.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.55 · 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
31.7 °C
25 February 2019
Coldest day
15.1 °C
7 August 1983
Wettest day
131 mm
23 March 1991
Windiest day
51.9 km/h
6 May 2013
Strongest gust
77.8 km/h
29 December 1990
Hottest feels-like
39.3 °C
3 March 2008
Coldest feels-like
10.2 °C
31 May 1979
Sunniest day
13.1 h
4 January 2014
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 | 27.9 °C | +0.9 °C | 78 mm | -36 mm |
| Feb | 29.2 °C | +1.8 °C | 8 mm | -69 mm |
| Mar | 28.5 °C | +1.2 °C | 60 mm | -45 mm |
| Apr | 27.0 °C | +0.7 °C | 98 mm | +21 mm |
| May | 25.9 °C | +1.0 °C | 46 mm | -8 mm |
| Jun | 25.2 °C | +1.2 °C | 21 mm | -16 mm |
| Jul | 23.6 °C | +0.1 °C | 28 mm | -6 mm |
| Aug | 23.9 °C | +0.2 °C | 23 mm | -10 mm |
| Sep | 24.2 °C | +0.2 °C | 44 mm | -8 mm |
| Oct | 24.7 °C | -0.1 °C | 81 mm | -15 mm |
| Nov | 26.2 °C | +0.8 °C | 46 mm | -100 mm |
| Dec | 27.4 °C | +1.1 °C | 129 mm | -19 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 da Barra?
São João da Barra has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 23.6 °C and it receives 973 mm of precipitation per year.
What is the hottest day ever recorded in São João da Barra?
The hottest day measured in São João da Barra between 1940 and 2025 was 25 February 2019, reaching 31.7 °C.
What is the coldest day in São João da Barra?
The coldest day measured in São João da Barra between 1940 and 2025 was 7 August 1983, at 15.1 °C.
Does it snow in São João da Barra?
Almost never: São João da Barra sees virtually no snow, with about 0 frost days per year.
Has the climate of São João da Barra warmed?
Yes: São João da Barra warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in São João da Barra?
The wettest day measured in São João da Barra between 1940 and 2025 was 23 March 1991, with 131 mm of rain in 24 hours.
What was the windiest day in São João da Barra?
The windiest day measured in São João da Barra between 1940 and 2025 was 6 May 2013, with winds reaching 51.9 km/h.
What is the warmest month in São João da Barra?
The warmest month in São João da Barra is February (25.6 °C on average); the coldest is July (21.5 °C).
How much does it rain in São João da Barra?
São João da Barra receives on average 973 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in São João da Barra?
São João da Barra gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
Are there tropical nights in São João da Barra?
Yes: São João da Barra has on average 309 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in São João da Barra?
In São João da Barra, between 1940 and 2025, the highest apparent temperature reached 39.3 °C on 3 March 2008, and the lowest was 10.2 °C on 31 May 1979.
Compare São João da Barra with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around São João da Barra