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Monthly climate in Viseu, Portugal

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Viseu features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 7 °C (44 °F) and 21 °C (69 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 38 °C (100 °F). The average annual precipitation amounts to about 1148 mm (45.2 inches) and receives 109 rainy days on the 1 mm (0.04 inches) threshold annually. Viseu enjoys an average of 3674 hours of sunshine throughout the year, and daylight varies from 9 hours 18 minutes to 15 hours 1 minutes per day.

Monthly average temperatures in Viseu, Portugal

The warmest months in Viseu are July, August and September, with daily mean temperatures ranging from 19 to 21 °C (66 - 69 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 9 °C (44 - 48 °F) throughout the day. On average each year, Viseu experiences 63 days above 25 °C (77.0 °F) and 10 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Viseu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum18°C
(65°F)		22°C
(71°F)		25°C
(77°F)		26°C
(79°F)		30°C
(87°F)		35°C
(95°F)		34°C
(94°F)		38°C
(100°F)		32°C
(91°F)		31°C
(88°F)		20°C
(69°F)		17°C
(63°F)
Mean maximum16°C
(60°F)		19°C
(66°F)		21°C
(70°F)		24°C
(75°F)		28°C
(83°F)		30°C
(86°F)		32°C
(91°F)		34°C
(93°F)		31°C
(88°F)		27°C
(80°F)		19°C
(66°F)		16°C
(61°F)
Average high11°C
(52°F)		14°C
(57°F)		15°C
(59°F)		17°C
(63°F)		21°C
(70°F)		23°C
(73°F)		27°C
(80°F)		27°C
(81°F)		25°C
(77°F)		20°C
(69°F)		14°C
(58°F)		12°C
(54°F)
Daily mean7°C
(44°F)		9°C
(48°F)		10°C
(50°F)		12°C
(54°F)		16°C
(60°F)		18°C
(64°F)		20°C
(69°F)		21°C
(69°F)		19°C
(66°F)		15°C
(59°F)		10°C
(50°F)		8°C
(47°F)
Average low3°C
(38°F)		5°C
(41°F)		6°C
(43°F)		8°C
(47°F)		10°C
(51°F)		13°C
(55°F)		15°C
(59°F)		15°C
(59°F)		14°C
(57°F)		11°C
(51°F)		7°C
(44°F)		5°C
(42°F)
Mean minimum-2°C
(29°F)		-0°C
(31°F)		1°C
(34°F)		2°C
(36°F)		4°C
(40°F)		8°C
(47°F)		9°C
(49°F)		10°C
(49°F)		9°C
(48°F)		4°C
(40°F)		1°C
(34°F)		0°C
(33°F)
Minimum-4°C
(25°F)		-3°C
(27°F)		-0°C
(32°F)		-1°C
(31°F)		2°C
(36°F)		5°C
(42°F)		7°C
(45°F)		8°C
(47°F)		6°C
(43°F)		0°C
(33°F)		-2°C
(28°F)		-2°C
(28°F)

Compare climate in Viseu with other places

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

Monthly average precipitation in Viseu, Portugal

Viseu usually has the most precipitation in March, November and December, with an average of 12 rainy days and 158 mm (6.2 inches) of precipitation per month. The driest months in Viseu are July, August and September. On average, 28 mm (1.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Viseu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)85 (3.3)134 (5.3)152 (6.0)145 (5.7)68 (2.7)49 (1.9)19 (0.7)19 (0.8)47 (1.8)108 (4.3)149 (5.9)174 (6.8)
Average precipitation days (≥ 1 mm)710121410933691313

Monthly sunshine hours in Viseu, Portugal

The sunniest months in Viseu are May, June and July, when the sun shines an average of 13 hours 27 minutes a day. Least sunny months in Viseu: January, November and December receive an average of 6 hours 0 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Viseu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours161211284341404406427399344303208181
Mean daily daylight hours9h 37m10h 39m11h 57m13h 18m14h 27m15h 1m14h 43m13h 42m12h 24m11h 4m9h 54m9h 18m

Solar UV radiation in Viseu, Portugal

Viseu experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Viseu UV Index data.

Average daily maximum UV levels by month for Viseu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)346910111098642