Viana do Castelo climate — normals and trends

Q: What is the climate of Viana do Castelo?

Viana do Castelo has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 14.2 °C and it receives 1,755 mm of precipitation per year.

Q: What is the hottest day ever recorded in Viana do Castelo?

The hottest day measured in Viana do Castelo between 1940 and 2025 was 21 July 1941, reaching 33.9 °C.

Q: What is the coldest day in Viana do Castelo?

The coldest day measured in Viana do Castelo between 1940 and 2025 was 12 February 1978, at -3.5 °C.

Q: Does it snow in Viana do Castelo?

Almost never: Viana do Castelo sees virtually no snow, with about 1 frost days per year.

Q: Has the climate of Viana do Castelo warmed?

Yes: Viana do Castelo warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Viana do Castelo?

The wettest day measured in Viana do Castelo between 1940 and 2025 was 26 December 1959, with 129 mm of rain in 24 hours.

Q: What was the windiest day in Viana do Castelo?

The windiest day measured in Viana do Castelo between 1940 and 2025 was 15 February 1941, with winds reaching 75.2 km/h.

Q: What is the warmest month in Viana do Castelo?

The warmest month in Viana do Castelo is August (19.6 °C on average); the coldest is January (9.2 °C).

Q: How much does it rain in Viana do Castelo?

Viana do Castelo receives on average 1,755 mm of precipitation per year, spread over about 129 rainy days.

Q: Is it sunny in Viana do Castelo?

Viana do Castelo gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.

Viana do Castelo (Portugal) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 14.2 °C and it receives 1,755 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 (19.6 °C on average) and the coldest is January (9.2 °C). Rainfall peaks in December.

Viana do Castelo averages 1 frost days, 2 hot days (≥ 30 °C) and 129 rainy days per year.

Viana do Castelo has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.

The number of frost days there went from about 3 to 0 per year over the period.

The hottest day of the period reached 33.9 °C (on 21 July 1941) and the coldest -3.5 °C (on 12 February 1978).

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

Viana do CasteloViana do Castelo District

coords: 41.69°, -8.83°
period: 1940–2025 · 86 yrs

CsbWarm-summer MediterraneanWarmest monthAugustColdest monthJanuaryWettest monthDecemberDriest monthJuly

Mean daily temperature

14.2°C

Average daily high

17.6°C

Average daily low

10.9°C

Annual rainfall

1,755mm

Sunshine / day

9.9h

Mean relative humidity

80%

Average peak wind

18.7km/h

Seasonal range

10.4°C

Frost days (< 0 °C)

1 d/yr

Hot days (≥ 30 °C)

2 d/yr

Rainy days (≥ 1 mm)

129 d/yr

Annual snowfall

0.2 cm

Average feels-like high

16.8 °C

Average feels-like low

9.0 °C

Average peak gust

38.2 km/h

Tropical nights (≥ 20 °C)

1 d/yr

Solar radiation

16.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.1 °C

since 1940

+0.1 °C per decade · r² = 0.34 · p = < 0.001

19402025

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

33.9 °C

21 July 1941

Coldest day

-3.5 °C

12 February 1978

Wettest day

129 mm

26 December 1959

Windiest day

75.2 km/h

15 February 1941

Strongest gust

168.1 km/h

15 February 1941

Hottest feels-like

37.8 °C

14 June 1981

Coldest feels-like

-7.9 °C

11 January 1941

Snowiest day

3.2 cm

23 February 1948

Sunniest day

14.9 h

17 June 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	31.9 °C5 August 2025	0.9 °C16 January 2025	15.2 °C	2,065 mm	3	0
2024	29.6 °C23 July 2024	2.6 °C7 January 2024	15.3 °C	1,723 mm	0	0
2023	30.1 °C22 August 2023	0.9 °C31 January 2023	15.2 °C	1,975 mm	1	0
2022	32.9 °C12 July 2022	1.6 °C24 January 2022	15.3 °C	1,995 mm	3	0
2021	29.2 °C16 July 2021	-0.6 °C5 January 2021	14.5 °C	1,420 mm	0	2
2020	30.3 °C17 July 2020	1.7 °C12 January 2020	15.1 °C	1,553 mm	1	0
2019	28.3 °C12 July 2019	0.4 °C5 January 2019	14.3 °C	1,749 mm	0	0
2018	32.0 °C3 August 2018	1.4 °C8 February 2018	14.5 °C	1,799 mm	4	0
2017	30.5 °C20 August 2017	0.4 °C19 January 2017	14.8 °C	1,160 mm	1	0
2016	33.1 °C7 August 2016	2.6 °C31 December 2016	14.7 °C	1,852 mm	3	0
2015	29.0 °C20 June 2015	1.6 °C8 February 2015	14.8 °C	1,342 mm	0	0
2014	29.1 °C14 June 2014	1.8 °C16 February 2014	14.8 °C	2,254 mm	0	0
2013	32.5 °C6 July 2013	0.9 °C25 February 2013	14.5 °C	2,168 mm	5	0
2012	29.5 °C17 July 2012	-0.5 °C4 February 2012	14.0 °C	1,297 mm	0	1
2011	30.6 °C25 June 2011	0.9 °C24 January 2011	15.0 °C	1,452 mm	1	0
2010	30.9 °C31 August 2010	-0.1 °C9 January 2010	14.6 °C	1,856 mm	7	1
2009	28.0 °C30 August 2009	-0.2 °C8 January 2009	14.4 °C	2,001 mm	0	2
2008	28.5 °C19 July 2008	0.4 °C26 December 2008	13.9 °C	1,535 mm	0	0
2007	29.7 °C30 July 2007	0.2 °C27 January 2007	14.1 °C	1,131 mm	0	0
2006	32.0 °C17 July 2006	-0.6 °C31 January 2006	14.9 °C	2,092 mm	7	1
2005	32.1 °C14 August 2005	-1.2 °C1 March 2005	14.2 °C	1,239 mm	3	2
2004	28.5 °C25 July 2004	0.5 °C21 February 2004	14.3 °C	1,191 mm	0	0
2003	31.6 °C8 August 2003	0.7 °C13 January 2003	14.7 °C	1,765 mm	6	0
2002	28.2 °C13 August 2002	3.1 °C2 March 2002	14.5 °C	1,966 mm	0	0
2001	30.0 °C31 July 2001	-0.4 °C25 December 2001	14.3 °C	2,224 mm	1	2
2000	29.7 °C17 June 2000	0.4 °C2 January 2000	14.1 °C	2,255 mm	0	0
1999	31.3 °C8 July 1999	1.0 °C12 January 1999	14.2 °C	1,749 mm	1	0
1998	30.7 °C24 August 1998	1.6 °C27 January 1998	14.7 °C	1,421 mm	1	0
1997	29.8 °C26 July 1997	0.8 °C5 January 1997	15.3 °C	2,185 mm	0	0
1996	30.8 °C14 June 1996	1.1 °C22 February 1996	14.2 °C	1,893 mm	1	0
1995	32.8 °C24 July 1995	1.3 °C15 December 1995	15.4 °C	1,982 mm	2	0
1994	28.9 °C22 June 1994	-1.0 °C5 February 1994	14.2 °C	1,926 mm	0	1
1993	31.6 °C23 July 1993	0.6 °C1 March 1993	14.0 °C	1,727 mm	2	0
1992	29.8 °C14 July 1992	0.3 °C20 January 1992	14.0 °C	1,245 mm	0	0
1991	32.5 °C17 August 1991	-0.1 °C23 December 1991	14.3 °C	1,483 mm	3	1
1990	33.5 °C23 July 1990	1.2 °C22 December 1990	15.0 °C	1,261 mm	9	0
1989	33.7 °C1 August 1989	1.4 °C2 January 1989	15.3 °C	1,553 mm	9	0
1988	32.5 °C6 September 1988	1.0 °C16 December 1988	14.3 °C	1,421 mm	2	0
1987	30.6 °C2 August 1987	-0.7 °C14 January 1987	14.8 °C	1,933 mm	4	1
1986	29.2 °C17 July 1986	1.2 °C9 February 1986	13.6 °C	1,486 mm	0	0
1985	30.5 °C10 September 1985	-1.3 °C9 January 1985	14.2 °C	1,949 mm	1	4
1984	30.5 °C31 August 1984	1.3 °C26 February 1984	13.8 °C	1,956 mm	1	0
1983	30.4 °C6 September 1983	-0.2 °C13 February 1983	14.1 °C	1,810 mm	1	2
1982	30.8 °C11 August 1982	2.0 °C31 December 1982	14.2 °C	1,352 mm	1	0
1981	32.9 °C14 June 1981	2.3 °C1 January 1981	14.4 °C	1,684 mm	7	0
1980	30.3 °C20 August 1980	-0.1 °C31 December 1980	13.8 °C	1,471 mm	1	1
1979	29.5 °C15 July 1979	0.9 °C17 February 1979	14.0 °C	2,206 mm	0	0
1978	31.5 °C25 August 1978	-3.5 °C12 February 1978	13.0 °C	2,283 mm	2	6
1977	29.7 °C13 September 1977	1.0 °C24 November 1977	13.6 °C	2,323 mm	0	0
1976	30.1 °C23 July 1976	0.3 °C3 January 1976	13.9 °C	1,599 mm	2	0
1975	29.9 °C30 July 1975	1.2 °C10 January 1975	13.8 °C	1,393 mm	0	0
1974	29.0 °C10 July 1974	1.6 °C27 February 1974	13.4 °C	1,807 mm	0	0
1973	29.8 °C11 July 1973	0.8 °C17 February 1973	13.7 °C	1,607 mm	0	0
1972	29.8 °C13 July 1972	-0.2 °C2 January 1972	13.2 °C	1,835 mm	0	1
1971	28.4 °C10 July 1971	-1.8 °C1 January 1971	13.4 °C	1,485 mm	0	2
1970	32.5 °C6 September 1970	-1.4 °C31 December 1970	13.6 °C	1,744 mm	3	4
1969	30.3 °C21 July 1969	0.7 °C1 January 1969	13.7 °C	2,211 mm	3	0
1968	30.1 °C30 June 1968	1.1 °C30 December 1968	14.1 °C	1,958 mm	1	0
1967	27.4 °C9 July 1967	0.4 °C11 January 1967	13.8 °C	1,332 mm	0	0
1966	31.1 °C7 September 1966	1.3 °C25 December 1966	14.1 °C	2,690 mm	1	0
1965	29.5 °C28 August 1965	-1.1 °C19 February 1965	13.6 °C	2,035 mm	0	3
1964	32.2 °C30 August 1964	-0.3 °C9 March 1964	13.7 °C	1,620 mm	3	4
1963	29.0 °C10 August 1963	-2.0 °C4 February 1963	13.5 °C	2,522 mm	0	6
1962	30.1 °C28 August 1962	-2.1 °C25 December 1962	13.9 °C	1,344 mm	1	3
1961	30.8 °C28 August 1961	-0.7 °C15 January 1961	14.7 °C	2,006 mm	1	1
1960	29.5 °C24 July 1960	-1.0 °C14 February 1960	13.9 °C	2,981 mm	0	4
1959	31.1 °C7 July 1959	1.6 °C3 February 1959	14.4 °C	2,175 mm	2	0
1958	27.8 °C4 August 1958	0.9 °C23 January 1958	13.6 °C	2,201 mm	0	0
1957	28.9 °C29 July 1957	-2.1 °C17 January 1957	13.7 °C	1,495 mm	0	3
1956	29.1 °C12 September 1956	-2.4 °C11 February 1956	12.8 °C	1,702 mm	0	9
1955	29.6 °C22 August 1955	-0.7 °C8 March 1955	14.5 °C	2,184 mm	0	1
1954	29.0 °C22 July 1954	-2.2 °C5 February 1954	13.5 °C	1,467 mm	0	7
1953	29.8 °C5 August 1953	-0.5 °C22 January 1953	14.1 °C	916 mm	0	2
1952	29.2 °C10 July 1952	-0.3 °C28 January 1952	13.9 °C	1,720 mm	0	1
1951	28.4 °C26 July 1951	0.9 °C30 January 1951	13.5 °C	1,981 mm	0	0
1950	29.3 °C14 August 1950	0.8 °C27 December 1950	14.1 °C	1,653 mm	0	0
1949	32.2 °C4 July 1949	-0.1 °C1 February 1949	14.5 °C	1,053 mm	9	1
1948	28.9 °C17 September 1948	-2.4 °C22 February 1948	14.4 °C	1,758 mm	0	1
1947	28.9 °C9 June 1947	-1.7 °C26 January 1947	14.2 °C	1,898 mm	0	3
1946	32.5 °C11 July 1946	-1.9 °C17 January 1946	13.6 °C	1,684 mm	5	5
1945	31.4 °C23 July 1945	-0.8 °C3 January 1945	14.6 °C	1,301 mm	1	5
1944	30.3 °C12 August 1944	-1.6 °C24 February 1944	13.8 °C	1,013 mm	2	7
1943	32.1 °C15 August 1943	0.9 °C30 December 1943	14.4 °C	1,347 mm	7	0
1942	30.4 °C10 September 1942	-0.6 °C9 February 1942	13.7 °C	2,002 mm	1	5
1941	33.9 °C21 July 1941	-3.2 °C11 January 1941	13.8 °C	2,099 mm	3	8
1940	31.8 °C17 August 1940	-2.3 °C23 January 1940	13.8 °C	1,720 mm	1	10

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

18.9 °C

+1.3 °C

Hot days (≥ 30 °C)

3 d/yr

Frost days (< 0 °C)

0 d/yr

-1

Annual rainfall

2065 mm

+310 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	14.0 °C	+1.7 °C	408 mm	+183 mm
Feb	14.4 °C	+1.3 °C	125 mm	-66 mm
Mar	15.5 °C	+0.6 °C	179 mm	-6 mm
Apr	18.2 °C	+2.0 °C	223 mm	+77 mm
May	19.9 °C	+1.7 °C	86 mm	-44 mm
Jun	23.2 °C	+2.1 °C	68 mm	+4 mm
Jul	25.0 °C	+1.8 °C	14 mm	-12 mm
Aug	25.2 °C	+1.7 °C	16 mm	-21 mm
Sep	21.5 °C	-0.5 °C	73 mm	-20 mm
Oct	20.6 °C	+1.7 °C	172 mm	-27 mm
Nov	15.6 °C	+0.4 °C	405 mm	+183 mm
Dec	13.1 °C	+0.1 °C	295 mm	+60 mm

The year's extremes

Hottest day

31.9 °C

5 Aug 2025

Coldest day

0.9 °C

16 Jan 2025

Wettest day

71.6 mm

5 Jan 2025

Windiest day

59.6 km/h

20 Mar 2025

Strongest gust

108.0 km/h

20 Mar 2025

Hottest feels-like

35.1 °C

17 Jun 2025

Coldest feels-like

-1.6 °C

16 Jan 2025

Snowiest day

0.2 cm

21 Dec 2025

Sunniest day

14.9 h

17 Jun 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Viana do Castelo?

Viana do Castelo has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 14.2 °C and it receives 1,755 mm of precipitation per year.

What is the hottest day ever recorded in Viana do Castelo?

The hottest day measured in Viana do Castelo between 1940 and 2025 was 21 July 1941, reaching 33.9 °C.

What is the coldest day in Viana do Castelo?

The coldest day measured in Viana do Castelo between 1940 and 2025 was 12 February 1978, at -3.5 °C.

Does it snow in Viana do Castelo?

Almost never: Viana do Castelo sees virtually no snow, with about 1 frost days per year.

Has the climate of Viana do Castelo warmed?

Yes: Viana do Castelo warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Viana do Castelo?

The wettest day measured in Viana do Castelo between 1940 and 2025 was 26 December 1959, with 129 mm of rain in 24 hours.

What was the windiest day in Viana do Castelo?

The windiest day measured in Viana do Castelo between 1940 and 2025 was 15 February 1941, with winds reaching 75.2 km/h.

What is the warmest month in Viana do Castelo?

The warmest month in Viana do Castelo is August (19.6 °C on average); the coldest is January (9.2 °C).

How much does it rain in Viana do Castelo?

Viana do Castelo receives on average 1,755 mm of precipitation per year, spread over about 129 rainy days.

Is it sunny in Viana do Castelo?

Viana do Castelo gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.

What is the biggest single-day snowfall in Viana do Castelo?

The heaviest 24-hour snowfall measured in Viana do Castelo between 1940 and 2025 was 23 February 1948, with 3.2 cm.

Are there tropical nights in Viana do Castelo?

Yes: Viana do Castelo has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Viana do Castelo?

In Viana do Castelo, between 1940 and 2025, the highest apparent temperature reached 37.8 °C on 14 June 1981, and the lowest was -7.9 °C on 11 January 1941.

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