Castilho climate — normals and trends
Castilho (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 24.5 °C and it receives 1,259 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 January (26.3 °C on average) and the coldest is June (21.0 °C). Rainfall peaks in January.
Castilho averages 0 frost days, 173 hot days (≥ 30 °C) and 142 rainy days per year.
Castilho has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.3 °C (on 17 October 1963) and the coldest 2.6 °C (on 18 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
CastilhoSão Paulo
- coords
- -20.87°, -51.49°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
24.5°C
Average daily high
29.6°C
Average daily low
20.3°C
Annual rainfall
1,259mm
Sunshine / day
10.2h
Mean relative humidity
71%
Average peak wind
13.0km/h
Seasonal range
5.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
173 d/yr
Rainy days (≥ 1 mm)
142 d/yr
Annual snowfall
0.0 cm
Average feels-like high
32.6 °C
Average feels-like low
22.0 °C
Average peak gust
29.4 km/h
Tropical nights (≥ 20 °C)
222 d/yr
Solar radiation
18.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.63 · 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
42.3 °C
17 October 1963
Coldest day
2.6 °C
18 July 1975
Wettest day
87 mm
10 December 1967
Windiest day
39.6 km/h
15 September 1956
Strongest gust
82.1 km/h
22 September 2025
Hottest feels-like
45.0 °C
9 December 2012
Coldest feels-like
-1.8 °C
18 July 1975
Sunniest day
13.0 h
18 December 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 | 33.5 °C | +3.1 °C | 89 mm | -126 mm |
| Feb | 32.3 °C | +1.9 °C | 124 mm | -74 mm |
| Mar | 34.0 °C | +3.7 °C | 43 mm | -109 mm |
| Apr | 29.8 °C | +0.4 °C | 73 mm | +6 mm |
| May | 29.2 °C | +1.9 °C | 23 mm | -23 mm |
| Jun | 27.5 °C | +0.9 °C | 26 mm | -2 mm |
| Jul | 28.0 °C | +0.7 °C | 1 mm | -19 mm |
| Aug | 30.3 °C | +0.4 °C | 1 mm | -20 mm |
| Sep | 34.5 °C | +3.0 °C | 8 mm | -41 mm |
| Oct | 31.7 °C | +0.4 °C | 59 mm | -57 mm |
| Nov | 32.1 °C | +1.3 °C | 64 mm | -81 mm |
| Dec | 32.5 °C | +2.1 °C | 138 mm | -66 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 Castilho?
Castilho has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 24.5 °C and it receives 1,259 mm of precipitation per year.
What is the hottest day ever recorded in Castilho?
The hottest day measured in Castilho between 1940 and 2025 was 17 October 1963, reaching 42.3 °C.
What is the coldest day in Castilho?
The coldest day measured in Castilho between 1940 and 2025 was 18 July 1975, at 2.6 °C.
Does it snow in Castilho?
Almost never: Castilho sees virtually no snow, with about 0 frost days per year.
Has the climate of Castilho warmed?
Yes: Castilho warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castilho?
The wettest day measured in Castilho between 1940 and 2025 was 10 December 1967, with 87 mm of rain in 24 hours.
What was the windiest day in Castilho?
The windiest day measured in Castilho between 1940 and 2025 was 15 September 1956, with winds reaching 39.6 km/h.
What is the warmest month in Castilho?
The warmest month in Castilho is January (26.3 °C on average); the coldest is June (21.0 °C).
How much does it rain in Castilho?
Castilho receives on average 1,259 mm of precipitation per year, spread over about 142 rainy days.
Is it sunny in Castilho?
Castilho gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
Are there tropical nights in Castilho?
Yes: Castilho has on average 222 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castilho?
In Castilho, between 1940 and 2025, the highest apparent temperature reached 45.0 °C on 9 December 2012, and the lowest was -1.8 °C on 18 July 1975.
Compare Castilho with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Castilho