Fortuna climate — normals and trends
Fortuna (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.4 °C and it receives 1,214 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 March (24.8 °C). Rainfall peaks in March.
Fortuna averages 0 frost days, 267 hot days (≥ 30 °C) and 153 rainy days per year.
Fortuna has warmed by +0.9 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.8 °C (on 18 October 1958) and the coldest 17.2 °C (on 15 August 1959).
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
FortunaMaranhão
- coords
- -5.73°, -44.16°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.4°C
Average daily high
31.7°C
Average daily low
22.4°C
Annual rainfall
1,214mm
Sunshine / day
10.3h
Mean relative humidity
72%
Average peak wind
11.1km/h
Seasonal range
3.6°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
267 d/yr
Rainy days (≥ 1 mm)
153 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.7 °C
Average feels-like low
25.0 °C
Average peak gust
31.6 km/h
Tropical nights (≥ 20 °C)
358 d/yr
Solar radiation
19.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.9 °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
38.8 °C
18 October 1958
Coldest day
17.2 °C
15 August 1959
Wettest day
178 mm
30 November 1978
Windiest day
26.6 km/h
5 July 2017
Strongest gust
62.6 km/h
17 August 1991
Hottest feels-like
44.0 °C
21 October 2015
Coldest feels-like
16.2 °C
14 August 1959
Sunniest day
12.0 h
2 December 2019
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 | 30.4 °C | +0.5 °C | 279 mm | +60 mm |
| Feb | 30.7 °C | +1.2 °C | 101 mm | -115 mm |
| Mar | 30.2 °C | +1.0 °C | 183 mm | -71 mm |
| Apr | 31.3 °C | +1.7 °C | 68 mm | -104 mm |
| May | 32.8 °C | +2.4 °C | 6 mm | -58 mm |
| Jun | 33.0 °C | +1.5 °C | 2 mm | -9 mm |
| Jul | 33.7 °C | +1.3 °C | 1 mm | -4 mm |
| Aug | 34.3 °C | +0.6 °C | 3 mm | -0 mm |
| Sep | 35.7 °C | +0.9 °C | 1 mm | -10 mm |
| Oct | 35.2 °C | +0.8 °C | 30 mm | -2 mm |
| Nov | 34.1 °C | +1.1 °C | 17 mm | -68 mm |
| Dec | 31.5 °C | 0.0 °C | 95 mm | -44 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 Fortuna?
Fortuna has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.4 °C and it receives 1,214 mm of precipitation per year.
What is the hottest day ever recorded in Fortuna?
The hottest day measured in Fortuna between 1940 and 2025 was 18 October 1958, reaching 38.8 °C.
What is the coldest day in Fortuna?
The coldest day measured in Fortuna between 1940 and 2025 was 15 August 1959, at 17.2 °C.
Does it snow in Fortuna?
Almost never: Fortuna sees virtually no snow, with about 0 frost days per year.
Has the climate of Fortuna warmed?
Yes: Fortuna warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Fortuna?
The wettest day measured in Fortuna between 1940 and 2025 was 30 November 1978, with 178 mm of rain in 24 hours.
What was the windiest day in Fortuna?
The windiest day measured in Fortuna between 1940 and 2025 was 5 July 2017, with winds reaching 26.6 km/h.
What is the warmest month in Fortuna?
The warmest month in Fortuna is September (28.4 °C on average); the coldest is March (24.8 °C).
How much does it rain in Fortuna?
Fortuna receives on average 1,214 mm of precipitation per year, spread over about 153 rainy days.
Is it sunny in Fortuna?
Fortuna gets on average 10.3 hours of sunshine per day, roughly 3,760 hours per year over 1940-2025.
Are there tropical nights in Fortuna?
Yes: Fortuna has on average 358 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Fortuna?
In Fortuna, between 1940 and 2025, the highest apparent temperature reached 44.0 °C on 21 October 2015, and the lowest was 16.2 °C on 14 August 1959.
Compare Fortuna with another city
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Nearby cities
The climate around Fortuna