Castelo Branco climate — normals and trends
Castelo Branco (Portugal) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 15.7 °C and it receives 602 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 July (24.6 °C on average) and the coldest is January (7.9 °C). Rainfall peaks in December.
Castelo Branco averages 7 frost days, 68 hot days (≥ 30 °C) and 78 rainy days per year.
Castelo Branco has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 12 to 2 per year over the period.
The hottest day of the period reached 43.0 °C (on 3 August 2018) and the coldest -6.3 °C (on 4 January 1971).
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
Castelo BrancoCastelo Branco District
- coords
- 39.82°, -7.49°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.7°C
Average daily high
21.2°C
Average daily low
10.6°C
Annual rainfall
602mm
Sunshine / day
10.1h
Mean relative humidity
67%
Average peak wind
15.0km/h
Seasonal range
16.7°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
68 d/yr
Rainy days (≥ 1 mm)
78 d/yr
Annual snowfall
0.8 cm
Average feels-like high
19.9 °C
Average feels-like low
8.9 °C
Average peak gust
33.1 km/h
Tropical nights (≥ 20 °C)
17 d/yr
Solar radiation
16.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.13 · 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
43.0 °C
3 August 2018
Coldest day
-6.3 °C
4 January 1971
Wettest day
66 mm
20 January 1941
Windiest day
49.1 km/h
30 December 1981
Strongest gust
120.2 km/h
30 December 1981
Hottest feels-like
44.2 °C
3 August 2018
Coldest feels-like
-9.7 °C
4 January 1971
Snowiest day
10.5 cm
3 January 1971
Sunniest day
14.8 h
27 June 2025
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 | 14.1 °C | +2.0 °C | 156 mm | +83 mm |
| Feb | 15.5 °C | +1.6 °C | 39 mm | -28 mm |
| Mar | 15.9 °C | -0.9 °C | 172 mm | +105 mm |
| Apr | 19.8 °C | +0.7 °C | 106 mm | +51 mm |
| May | 24.5 °C | +1.7 °C | 31 mm | -16 mm |
| Jun | 32.4 °C | +4.5 °C | 14 mm | -4 mm |
| Jul | 34.0 °C | +2.1 °C | 1 mm | -4 mm |
| Aug | 34.9 °C | +3.2 °C | 1 mm | -6 mm |
| Sep | 28.4 °C | +0.7 °C | 22 mm | -9 mm |
| Oct | 25.0 °C | +3.2 °C | 62 mm | -11 mm |
| Nov | 16.2 °C | +0.3 °C | 151 mm | +71 mm |
| Dec | 12.9 °C | +0.3 °C | 124 mm | +43 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 Castelo Branco?
Castelo Branco has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 15.7 °C and it receives 602 mm of precipitation per year.
What is the hottest day ever recorded in Castelo Branco?
The hottest day measured in Castelo Branco between 1940 and 2025 was 3 August 2018, reaching 43.0 °C.
What is the coldest day in Castelo Branco?
The coldest day measured in Castelo Branco between 1940 and 2025 was 4 January 1971, at -6.3 °C.
Does it snow in Castelo Branco?
Almost never: Castelo Branco sees virtually no snow, with about 7 frost days per year.
Has the climate of Castelo Branco warmed?
Yes: Castelo Branco warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castelo Branco?
The wettest day measured in Castelo Branco between 1940 and 2025 was 20 January 1941, with 66 mm of rain in 24 hours.
What was the windiest day in Castelo Branco?
The windiest day measured in Castelo Branco between 1940 and 2025 was 30 December 1981, with winds reaching 49.1 km/h.
What is the warmest month in Castelo Branco?
The warmest month in Castelo Branco is July (24.6 °C on average); the coldest is January (7.9 °C).
How much does it rain in Castelo Branco?
Castelo Branco receives on average 602 mm of precipitation per year, spread over about 78 rainy days.
Is it sunny in Castelo Branco?
Castelo Branco gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.
What is the biggest single-day snowfall in Castelo Branco?
The heaviest 24-hour snowfall measured in Castelo Branco between 1940 and 2025 was 3 January 1971, with 10.5 cm.
Are there tropical nights in Castelo Branco?
Yes: Castelo Branco has on average 17 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castelo Branco?
In Castelo Branco, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 3 August 2018, and the lowest was -9.7 °C on 4 January 1971.
Compare Castelo Branco with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Castelo Branco