Castanhal climate — normals and trends
Castanhal (Brazil) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 26.3 °C and it receives 2,418 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 (27.9 °C on average) and the coldest is February (25.3 °C). Rainfall peaks in March.
Castanhal averages 0 frost days, 258 hot days (≥ 30 °C) and 247 rainy days per year.
Castanhal has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.3 °C (on 18 October 1941) and the coldest 19.1 °C (on 24 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
CastanhalPará
- coords
- -1.29°, -47.93°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.3°C
Average daily high
31.2°C
Average daily low
22.8°C
Annual rainfall
2,418mm
Sunshine / day
10.2h
Mean relative humidity
82%
Average peak wind
12.7km/h
Seasonal range
2.6°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
258 d/yr
Rainy days (≥ 1 mm)
247 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.5 °C
Average feels-like low
26.9 °C
Average peak gust
33.2 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
18.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.56 · 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
38.3 °C
18 October 1941
Coldest day
19.1 °C
24 July 1975
Wettest day
300 mm
9 March 2021
Windiest day
24.5 km/h
4 November 1944
Strongest gust
58.0 km/h
1 December 2015
Hottest feels-like
43.1 °C
3 April 1998
Coldest feels-like
21.7 °C
24 July 1975
Sunniest day
12.0 h
26 September 1940
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 | 30.6 °C | +0.4 °C | 389 mm | +83 mm |
| Feb | 30.1 °C | +0.5 °C | 744 mm | +376 mm |
| Mar | 30.1 °C | +0.7 °C | 548 mm | +89 mm |
| Apr | 30.6 °C | +1.0 °C | 421 mm | +3 mm |
| May | 31.6 °C | +1.4 °C | 211 mm | -70 mm |
| Jun | 31.4 °C | +0.8 °C | 123 mm | -23 mm |
| Jul | 31.6 °C | +0.8 °C | 139 mm | +28 mm |
| Aug | 31.7 °C | -0.1 °C | 114 mm | +53 mm |
| Sep | 32.5 °C | -0.2 °C | 35 mm | -4 mm |
| Oct | 32.8 °C | -0.8 °C | 37 mm | +9 mm |
| Nov | 32.8 °C | -0.7 °C | 50 mm | +0 mm |
| Dec | 32.4 °C | +0.4 °C | 69 mm | -82 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 Castanhal?
Castanhal has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 26.3 °C and it receives 2,418 mm of precipitation per year.
What is the hottest day ever recorded in Castanhal?
The hottest day measured in Castanhal between 1940 and 2025 was 18 October 1941, reaching 38.3 °C.
What is the coldest day in Castanhal?
The coldest day measured in Castanhal between 1940 and 2025 was 24 July 1975, at 19.1 °C.
Does it snow in Castanhal?
Almost never: Castanhal sees virtually no snow, with about 0 frost days per year.
Has the climate of Castanhal warmed?
Yes: Castanhal warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castanhal?
The wettest day measured in Castanhal between 1940 and 2025 was 9 March 2021, with 300 mm of rain in 24 hours.
What was the windiest day in Castanhal?
The windiest day measured in Castanhal between 1940 and 2025 was 4 November 1944, with winds reaching 24.5 km/h.
What is the warmest month in Castanhal?
The warmest month in Castanhal is November (27.9 °C on average); the coldest is February (25.3 °C).
How much does it rain in Castanhal?
Castanhal receives on average 2,418 mm of precipitation per year, spread over about 247 rainy days.
Is it sunny in Castanhal?
Castanhal gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
Are there tropical nights in Castanhal?
Yes: Castanhal has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castanhal?
In Castanhal, between 1940 and 2025, the highest apparent temperature reached 43.1 °C on 3 April 1998, and the lowest was 21.7 °C on 24 July 1975.
Compare Castanhal with another city
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Nearby cities
The climate around Castanhal