Formosa da Serra Negra climate — normals and trends
Formosa da Serra Negra (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.3 °C and it receives 1,262 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 (28.4 °C on average) and the coldest is February (24.8 °C). Rainfall peaks in March.
Formosa da Serra Negra averages 0 frost days, 249 hot days (≥ 30 °C) and 159 rainy days per year.
Formosa da Serra Negra has warmed by +0.7 °C between 1940 and 2025, or +0.08 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.9 °C (on 18 October 1958) and the coldest 16.8 °C (on 28 July 2025).
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
Formosa da Serra NegraMaranhão
- coords
- -6.44°, -46.19°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.3°C
Average daily high
31.4°C
Average daily low
22.1°C
Annual rainfall
1,262mm
Sunshine / day
10.4h
Mean relative humidity
69%
Average peak wind
12.4km/h
Seasonal range
3.6°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
249 d/yr
Rainy days (≥ 1 mm)
159 d/yr
Annual snowfall
0.0 cm
Average feels-like high
34.9 °C
Average feels-like low
24.6 °C
Average peak gust
31.9 km/h
Tropical nights (≥ 20 °C)
351 d/yr
Solar radiation
19.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.7 °C
since 1940
+0.1 °C per decade · r² = 0.11 · 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
38.9 °C
18 October 1958
Coldest day
16.8 °C
28 July 2025
Wettest day
199 mm
16 December 1977
Windiest day
28.5 km/h
25 May 1968
Strongest gust
56.9 km/h
10 June 1980
Hottest feels-like
43.5 °C
28 October 2018
Coldest feels-like
15.5 °C
28 July 1975
Sunniest day
12.1 h
26 January 2000
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 | 29.4 °C | +0.1 °C | 414 mm | +187 mm |
| Feb | 29.9 °C | +0.6 °C | 165 mm | -59 mm |
| Mar | 30.3 °C | +1.0 °C | 178 mm | -65 mm |
| Apr | 31.3 °C | +1.6 °C | 58 mm | -105 mm |
| May | 33.1 °C | +2.3 °C | 5 mm | -47 mm |
| Jun | 33.1 °C | +1.1 °C | 4 mm | -5 mm |
| Jul | 33.8 °C | +1.1 °C | 2 mm | -2 mm |
| Aug | 34.6 °C | +0.6 °C | 3 mm | -1 mm |
| Sep | 35.8 °C | +1.4 °C | 2 mm | -11 mm |
| Oct | 34.6 °C | +1.4 °C | 20 mm | -31 mm |
| Nov | 32.3 °C | +0.9 °C | 64 mm | -42 mm |
| Dec | 29.9 °C | -0.2 °C | 175 mm | +7 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 Formosa da Serra Negra?
Formosa da Serra Negra has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.3 °C and it receives 1,262 mm of precipitation per year.
What is the hottest day ever recorded in Formosa da Serra Negra?
The hottest day measured in Formosa da Serra Negra between 1940 and 2025 was 18 October 1958, reaching 38.9 °C.
What is the coldest day in Formosa da Serra Negra?
The coldest day measured in Formosa da Serra Negra between 1940 and 2025 was 28 July 2025, at 16.8 °C.
Does it snow in Formosa da Serra Negra?
Almost never: Formosa da Serra Negra sees virtually no snow, with about 0 frost days per year.
Has the climate of Formosa da Serra Negra warmed?
Yes: Formosa da Serra Negra warmed by +0.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Formosa da Serra Negra?
The wettest day measured in Formosa da Serra Negra between 1940 and 2025 was 16 December 1977, with 199 mm of rain in 24 hours.
What was the windiest day in Formosa da Serra Negra?
The windiest day measured in Formosa da Serra Negra between 1940 and 2025 was 25 May 1968, with winds reaching 28.5 km/h.
What is the warmest month in Formosa da Serra Negra?
The warmest month in Formosa da Serra Negra is September (28.4 °C on average); the coldest is February (24.8 °C).
How much does it rain in Formosa da Serra Negra?
Formosa da Serra Negra receives on average 1,262 mm of precipitation per year, spread over about 159 rainy days.
Is it sunny in Formosa da Serra Negra?
Formosa da Serra Negra gets on average 10.4 hours of sunshine per day, roughly 3,796 hours per year over 1940-2025.
Are there tropical nights in Formosa da Serra Negra?
Yes: Formosa da Serra Negra has on average 351 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Formosa da Serra Negra?
In Formosa da Serra Negra, between 1940 and 2025, the highest apparent temperature reached 43.5 °C on 28 October 2018, and the lowest was 15.5 °C on 28 July 1975.
Compare Formosa da Serra Negra with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Formosa da Serra Negra