Barreirinhas climate — normals and trends
Barreirinhas (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.0 °C and it receives 1,386 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 November (27.7 °C on average) and the coldest is March (26.2 °C). Rainfall peaks in March.
Barreirinhas averages 0 frost days, 235 hot days (≥ 30 °C) and 167 rainy days per year.
Barreirinhas 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 35.7 °C (on 12 October 2016) and the coldest 20.1 °C (on 23 July 1975).
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
BarreirinhasMaranhão
- coords
- -2.76°, -42.83°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.0°C
Average daily high
30.5°C
Average daily low
24.5°C
Annual rainfall
1,386mm
Sunshine / day
11.0h
Mean relative humidity
79%
Average peak wind
19.5km/h
Seasonal range
1.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
235 d/yr
Rainy days (≥ 1 mm)
167 d/yr
Annual snowfall
0.0 cm
Average feels-like high
34.5 °C
Average feels-like low
27.9 °C
Average peak gust
41.0 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
20.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.49 · 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
35.7 °C
12 October 2016
Coldest day
20.1 °C
23 July 1975
Wettest day
165 mm
27 March 1987
Windiest day
34.7 km/h
10 October 1957
Strongest gust
64.8 km/h
4 October 1947
Hottest feels-like
40.2 °C
26 March 2020
Coldest feels-like
20.8 °C
4 July 1974
Sunniest day
12.0 h
2 January 1940
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 | 30.3 °C | +0.3 °C | 263 mm | +107 mm |
| Feb | 29.8 °C | +0.5 °C | 222 mm | +3 mm |
| Mar | 29.9 °C | +0.8 °C | 373 mm | +63 mm |
| Apr | 30.1 °C | +0.8 °C | 220 mm | -78 mm |
| May | 30.7 °C | +1.0 °C | 72 mm | -136 mm |
| Jun | 30.5 °C | +0.4 °C | 46 mm | -33 mm |
| Jul | 31.8 °C | +1.1 °C | 15 mm | -24 mm |
| Aug | 32.2 °C | +0.4 °C | 14 mm | +5 mm |
| Sep | 32.8 °C | +1.0 °C | 1 mm | -3 mm |
| Oct | 32.8 °C | +1.2 °C | 3 mm | -2 mm |
| Nov | 31.5 °C | -0.1 °C | 6 mm | -5 mm |
| Dec | 30.8 °C | -0.4 °C | 37 mm | -11 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 Barreirinhas?
Barreirinhas has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.0 °C and it receives 1,386 mm of precipitation per year.
What is the hottest day ever recorded in Barreirinhas?
The hottest day measured in Barreirinhas between 1940 and 2025 was 12 October 2016, reaching 35.7 °C.
What is the coldest day in Barreirinhas?
The coldest day measured in Barreirinhas between 1940 and 2025 was 23 July 1975, at 20.1 °C.
Does it snow in Barreirinhas?
Almost never: Barreirinhas sees virtually no snow, with about 0 frost days per year.
Has the climate of Barreirinhas warmed?
Yes: Barreirinhas warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Barreirinhas?
The wettest day measured in Barreirinhas between 1940 and 2025 was 27 March 1987, with 165 mm of rain in 24 hours.
What was the windiest day in Barreirinhas?
The windiest day measured in Barreirinhas between 1940 and 2025 was 10 October 1957, with winds reaching 34.7 km/h.
What is the warmest month in Barreirinhas?
The warmest month in Barreirinhas is November (27.7 °C on average); the coldest is March (26.2 °C).
How much does it rain in Barreirinhas?
Barreirinhas receives on average 1,386 mm of precipitation per year, spread over about 167 rainy days.
Is it sunny in Barreirinhas?
Barreirinhas gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
Are there tropical nights in Barreirinhas?
Yes: Barreirinhas has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Barreirinhas?
In Barreirinhas, between 1940 and 2025, the highest apparent temperature reached 40.2 °C on 26 March 2020, and the lowest was 20.8 °C on 4 July 1974.
Compare Barreirinhas with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Barreirinhas