Arouca climate — normals and trends
Arouca (Portugal) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 13.2 °C and it receives 1,555 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 (20.1 °C on average) and the coldest is January (6.8 °C). Rainfall peaks in December.
Arouca averages 15 frost days, 15 hot days (≥ 30 °C) and 131 rainy days per year.
Arouca has warmed by +1.3 °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 24 to 6 per year over the period.
The hottest day of the period reached 38.3 °C (on 17 August 1991) and the coldest -8.7 °C (on 4 February 1963).
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
AroucaAveiro District
- coords
- 40.93°, -8.24°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.2°C
Average daily high
17.9°C
Average daily low
8.9°C
Annual rainfall
1,555mm
Sunshine / day
9.8h
Mean relative humidity
78%
Average peak wind
14.3km/h
Seasonal range
13.3°C
Frost days (< 0 °C)
15 d/yr
Hot days (≥ 30 °C)
15 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
1.4 cm
Average feels-like high
17.1 °C
Average feels-like low
7.2 °C
Average peak gust
38.6 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
15.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.31 · 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
17 August 1991
Coldest day
-8.7 °C
4 February 1963
Wettest day
120 mm
25 November 1952
Windiest day
47.1 km/h
15 February 1941
Strongest gust
136.4 km/h
15 February 1941
Hottest feels-like
41.0 °C
3 August 2018
Coldest feels-like
-12.9 °C
4 February 1963
Snowiest day
13.7 cm
23 February 1956
Sunniest day
14.9 h
20 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 | 12.9 °C | +2.2 °C | 326 mm | +138 mm |
| Feb | 13.9 °C | +1.8 °C | 87 mm | -82 mm |
| Mar | 14.7 °C | 0.0 °C | 211 mm | +51 mm |
| Apr | 18.2 °C | +1.7 °C | 222 mm | +77 mm |
| May | 20.8 °C | +1.8 °C | 123 mm | -9 mm |
| Jun | 26.0 °C | +3.2 °C | 41 mm | -30 mm |
| Jul | 28.3 °C | +2.6 °C | 15 mm | -13 mm |
| Aug | 28.9 °C | +2.9 °C | 12 mm | -21 mm |
| Sep | 23.3 °C | -0.2 °C | 40 mm | -44 mm |
| Oct | 21.8 °C | +2.8 °C | 194 mm | +24 mm |
| Nov | 14.5 °C | +0.6 °C | 375 mm | +195 mm |
| Dec | 11.6 °C | +0.4 °C | 220 mm | +24 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 Arouca?
Arouca has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 13.2 °C and it receives 1,555 mm of precipitation per year.
What is the hottest day ever recorded in Arouca?
The hottest day measured in Arouca between 1940 and 2025 was 17 August 1991, reaching 38.3 °C.
What is the coldest day in Arouca?
The coldest day measured in Arouca between 1940 and 2025 was 4 February 1963, at -8.7 °C.
Does it snow in Arouca?
Yes. Arouca gets on average 1.4 cm of snow per year and has around 15 frost days.
Has the climate of Arouca warmed?
Yes: Arouca warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arouca?
The wettest day measured in Arouca between 1940 and 2025 was 25 November 1952, with 120 mm of rain in 24 hours.
What was the windiest day in Arouca?
The windiest day measured in Arouca between 1940 and 2025 was 15 February 1941, with winds reaching 47.1 km/h.
What is the warmest month in Arouca?
The warmest month in Arouca is August (20.1 °C on average); the coldest is January (6.8 °C).
How much does it rain in Arouca?
Arouca receives on average 1,555 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Arouca?
Arouca gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.
What is the biggest single-day snowfall in Arouca?
The heaviest 24-hour snowfall measured in Arouca between 1940 and 2025 was 23 February 1956, with 13.7 cm.
Are there tropical nights in Arouca?
Yes: Arouca has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Arouca?
In Arouca, between 1940 and 2025, the highest apparent temperature reached 41.0 °C on 3 August 2018, and the lowest was -12.9 °C on 4 February 1963.
Compare Arouca with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arouca