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Monthly climate in Viana do Castelo, Portugal

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Viana do Castelo features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 9 °C (49 °F) and 20 °C (67 °F) through the year, but rarely can drop to -1 °C (31 °F) or can rise to as high as 32 °C (90 °F).The average annual precipitation amounts to about 1561 mm (61.4 inches) and receives 122 rainy days on the 1 mm (0.04 inches) threshold annually.Viana do Castelo enjoys an average of 3666 hours of sunshine throughout the year, and daylight varies from 9 hours 11 minutes to 15 hours 8 minutes per day.

Monthly average temperatures in Viana do Castelo, Portugal §

The warmest months in Viana do Castelo are July, August and September, with daily mean temperatures ranging from 19 to 20 °C (66 - 67 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 9 to 11 °C (49 - 52 °F) throughout the day. On average each year, Viana do Castelo experiences 23 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Viana do Castelo, Portugal.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 20°C
(69°F)		 21°C
(70°F)		 23°C
(73°F)		 26°C
(79°F)		 29°C
(84°F)		 28°C
(84°F)		 30°C
(87°F)		 32°C
(90°F)		 30°C
(86°F)		 29°C
(84°F)		 21°C
(70°F)		 19°C
(66°F)
Mean maximum 17°C
(62°F)		 19°C
(67°F)		 20°C
(69°F)		 23°C
(74°F)		 26°C
(79°F)		 26°C
(79°F)		 29°C
(84°F)		 29°C
(84°F)		 28°C
(83°F)		 24°C
(76°F)		 20°C
(68°F)		 18°C
(64°F)
Average high 13°C
(56°F)		 15°C
(58°F)		 15°C
(60°F)		 17°C
(63°F)		 19°C
(67°F)		 20°C
(69°F)		 23°C
(74°F)		 23°C
(74°F)		 23°C
(73°F)		 20°C
(68°F)		 16°C
(60°F)		 14°C
(57°F)
Daily mean 9°C
(49°F)		 11°C
(52°F)		 12°C
(53°F)		 13°C
(56°F)		 16°C
(61°F)		 17°C
(63°F)		 20°C
(67°F)		 20°C
(67°F)		 19°C
(66°F)		 16°C
(61°F)		 12°C
(54°F)		 11°C
(52°F)
Average low 6°C
(43°F)		 8°C
(46°F)		 8°C
(47°F)		 10°C
(50°F)		 12°C
(54°F)		 14°C
(57°F)		 16°C
(61°F)		 16°C
(61°F)		 15°C
(59°F)		 12°C
(55°F)		 9°C
(49°F)		 8°C
(47°F)
Mean minimum 1°C
(34°F)		 3°C
(37°F)		 4°C
(39°F)		 5°C
(41°F)		 8°C
(46°F)		 11°C
(52°F)		 12°C
(55°F)		 12°C
(54°F)		 11°C
(52°F)		 7°C
(45°F)		 5°C
(41°F)		 3°C
(38°F)
Minimum -1°C
(31°F)		 1°C
(35°F)		 2°C
(37°F)		 3°C
(38°F)		 6°C
(43°F)		 9°C
(48°F)		 11°C
(53°F)		 12°C
(54°F)		 10°C
(50°F)		 6°C
(43°F)		 3°C
(38°F)		 2°C
(36°F)

Compare climate in Viana do Castelo with other places

Compare temperature, precipitation, sunshine, UV index in Viana do Castelo, Portugal with other places around the world.

Monthly average precipitation in Viana do Castelo, Portugal §

Viana do Castelo usually has the most precipitation in March, November and December, with an average of 15 rainy days and 216 mm (8.5 inches) of precipitation per month.The driest months in Viana do Castelo are July, August and September. On average, 35 mm (1.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Viana do Castelo, Portugal.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 136 (5.4) 185 (7.3) 186 (7.3) 169 (6.7) 106 (4.2) 59 (2.3) 26 (1.0) 30 (1.2) 49 (1.9) 152 (6.0) 216 (8.5) 246 (9.7)
Average precipitation days (≥ 1 mm) 10 13 13 13 9 7 5 3 6 11 15 17

Monthly sunshine hours in Viana do Castelo, Portugal §

The sunniest months in Viana do Castelo are May, June and July, when the sun shines an average of 13 hours 27 minutes a day.Least sunny months in Viana do Castelo: January, November and December receive an average of 5 hours 54 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Viana do Castelo, Portugal.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 155 207 288 347 404 406 427 394 346 301 206 180
Mean daily daylight hours 9h 31m 10h 35m 11h 57m 13h 21m 14h 32m 15h 8m 14h 49m 13h 46m 12h 25m 11h 2m 9h 49m 9h 11m

Solar UV radiation in Viana do Castelo, Portugal §

Viana do Castelo experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Viana do Castelo UV Index data.

Average daily maximum UV levels by month for Viana do Castelo, Portugal.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 4 6 8 9 10 9 9 7 6 3 2