Sertã climate — normals and trends
Sertã (Portugal) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 14.8 °C and it receives 885 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 August (22.6 °C on average) and the coldest is January (7.9 °C). Rainfall peaks in December.
Sertã averages 5 frost days, 44 hot days (≥ 30 °C) and 94 rainy days per year.
Sertã has warmed by +1.2 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The number of frost days there went from about 9 to 1 per year over the period.
The hottest day of the period reached 41.6 °C (on 1 August 2003) and the coldest -8.7 °C (on 30 January 1947).
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
SertãCastelo Branco District
- coords
- 39.80°, -8.10°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.8°C
Average daily high
19.9°C
Average daily low
10.3°C
Annual rainfall
885mm
Sunshine / day
10.0h
Mean relative humidity
71%
Average peak wind
17.1km/h
Seasonal range
14.7°C
Frost days (< 0 °C)
5 d/yr
Hot days (≥ 30 °C)
44 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
0.9 cm
Average feels-like high
18.6 °C
Average feels-like low
8.4 °C
Average peak gust
37.1 km/h
Tropical nights (≥ 20 °C)
11 d/yr
Solar radiation
16.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.2 °C per decade · r² = 0.12 · 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
41.6 °C
1 August 2003
Coldest day
-8.7 °C
30 January 1947
Wettest day
115 mm
20 January 1941
Windiest day
51.2 km/h
27 February 2010
Strongest gust
125.6 km/h
30 December 1981
Hottest feels-like
42.8 °C
3 August 2018
Coldest feels-like
-13.1 °C
30 January 1947
Snowiest day
12.3 cm
3 January 1971
Sunniest day
14.8 h
26 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 | 13.6 °C | +1.9 °C | 261 mm | +146 mm |
| Feb | 14.7 °C | +1.5 °C | 48 mm | -56 mm |
| Mar | 15.2 °C | -0.7 °C | 219 mm | +121 mm |
| Apr | 18.8 °C | +0.8 °C | 133 mm | +54 mm |
| May | 23.0 °C | +1.7 °C | 47 mm | -19 mm |
| Jun | 30.4 °C | +4.6 °C | 7 mm | -21 mm |
| Jul | 31.8 °C | +2.4 °C | 2 mm | -6 mm |
| Aug | 32.7 °C | +3.2 °C | 1 mm | -9 mm |
| Sep | 26.5 °C | +0.3 °C | 43 mm | +2 mm |
| Oct | 23.7 °C | +2.9 °C | 86 mm | -15 mm |
| Nov | 15.5 °C | +0.2 °C | 249 mm | +135 mm |
| Dec | 12.4 °C | +0.2 °C | 128 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 Sertã?
Sertã has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 14.8 °C and it receives 885 mm of precipitation per year.
What is the hottest day ever recorded in Sertã?
The hottest day measured in Sertã between 1940 and 2025 was 1 August 2003, reaching 41.6 °C.
What is the coldest day in Sertã?
The coldest day measured in Sertã between 1940 and 2025 was 30 January 1947, at -8.7 °C.
Does it snow in Sertã?
Almost never: Sertã sees virtually no snow, with about 5 frost days per year.
Has the climate of Sertã warmed?
Yes: Sertã warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sertã?
The wettest day measured in Sertã between 1940 and 2025 was 20 January 1941, with 115 mm of rain in 24 hours.
What was the windiest day in Sertã?
The windiest day measured in Sertã between 1940 and 2025 was 27 February 2010, with winds reaching 51.2 km/h.
What is the warmest month in Sertã?
The warmest month in Sertã is August (22.6 °C on average); the coldest is January (7.9 °C).
How much does it rain in Sertã?
Sertã receives on average 885 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Sertã?
Sertã gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sertã?
The heaviest 24-hour snowfall measured in Sertã between 1940 and 2025 was 3 January 1971, with 12.3 cm.
Are there tropical nights in Sertã?
Yes: Sertã has on average 11 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sertã?
In Sertã, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 3 August 2018, and the lowest was -13.1 °C on 30 January 1947.
Compare Sertã with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sertã