Viseu climate
Viseu (Portugal) has a hot-summer Mediterranean climate (Köppen Csa). The average temperature over the year is 14 °C57 °F, and about 1,016 mm40 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Viseu climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 1151 | 236 | 644 | 1375.4 | 4 |
| Feb | 1253 | 236 | 745 | 1003.9 | 4 |
| Mar | 1558 | 439 | 949 | 1134.4 | 1 |
| Apr | 1763 | 643 | 1253 | 973.8 | 0 |
| May | 2170 | 847 | 1559 | 612.4 | 0 |
| Jun | 2679 | 1253 | 1966 | 311.2 | 0 |
| Jul | 3086 | 1356 | 2271 | 120.5 | 0 |
| Aug | 3187 | 1456 | 2272 | 200.8 | 0 |
| Sep | 2781 | 1254 | 2067 | 471.9 | 0 |
| Oct | 2169 | 949 | 1559 | 1395.5 | 0 |
| Nov | 1457 | 541 | 949 | 1385.4 | 0 |
| Dec | 1152 | 337 | 745 | 1224.8 | 3 |
| Year | 3187 | 236 | 1457 | 1,01640 | 14 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 89% | 61% | 2.0 | 9:34 |
| Feb | 85% | 54% | 3.0 | 10:36 |
| Mar | 81% | 58% | 4.1 | 11:49 |
| Apr | 79% | 59% | 5.2 | 13:14 |
| May | 74% | 52% | 6.5 | 14:26 |
| Jun | 64% | 41% | 7.3 | 15:04 |
| Jul | 56% | 25% | 7.7 | 14:48 |
| Aug | 53% | 28% | 6.8 | 13:47 |
| Sep | 58% | 38% | 5.2 | 12:24 |
| Oct | 73% | 54% | 3.3 | 11:02 |
| Nov | 85% | 57% | 2.2 | 9:51 |
| Dec | 88% | 60% | 1.8 | 9:16 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Viseu is like
The warmest month is August, with an average high of 31 °C87 °F and a low of 14 °C56 °F. The coldest is January, when highs average 11 °C51 °F and lows 2 °C36 °F. There is a clear seasonal cycle, with 15.6 °C28 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,016 mm40 in of precipitation per year. The wettest three-month stretch is October–December, which brings 39% of the annual total. Months with less than 20 mm0.8 in on average: July and August. The wettest month is October (139 mm5.5 in), the driest is July (12 mm0.5 in).
Relative humidity ranges from 53% in August to 89% in January. The clearest skies (lowest average cloud amount, 25%) are typical of July. Average wind speed near the ground ranges from 0 km/h (0 mph) in July to 1 km/h (0 mph) in January. Daylight lasts from about 9.3 hours in December to 15.1 hours in June.
Best time to visit Viseu
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May and June and September: average highs of 21 °C70 °F to 27 °C81 °F with 31 mm1.2 in to 61 mm2.4 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 11 °C51 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Viseu
- Winter (December–February) — highs 1151 to 12 °C53 °F, lows 236 to 3 °C37 °F, about 120 mm4.7 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Spring (March–May) — highs 1558 to 21 °C70 °F, lows 439 to 8 °C47 °F, about 90 mm3.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Summer (June–August) — highs 2679 to 31 °C87 °F, lows 1253 to 14 °C56 °F, about 21 mm0.8 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 1457 to 27 °C81 °F, lows 541 to 12 °C54 °F, about 108 mm4.3 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
How Viseu compares
Compared with Coimbra, about 67 km to the southwest, Viseu is on average 2.9 °C5.3 °F cooler and receives 20% more precipitation (1,016 mm40 in vs 846 mm33 in). The difference is largest in May (3.1 °C5.6 °F cooler).
Of the 9 places in Portugal covered by World Climates, Viseu is the 9th warmest by annual mean temperature and the 2nd wettest by annual precipitation. See all of them on the Portugal climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Ourense (Spain, Csa), Los Ángeles (Chile, Csb) and Souk Ahras (Algeria, Csa).
Nearby places
- Coimbra 67 km · 17 °C62 °F · 846 mm33 in
- Porto 80 km · 15 °C59 °F · 1,009 mm40 in
- Braga 108 km · 15 °C59 °F · 1,035 mm41 in
- Leiria 127 km · 16 °C61 °F · 658 mm26 in
- Ourense 186 km · 15 °C59 °F · 1,144 mm45 in
- Vigo 187 km · 15 °C59 °F · 1,164 mm46 in
- Salamanca 192 km · 13 °C55 °F · 409 mm16 in
- Badajoz 214 km · 17 °C62 °F · 544 mm21 in
Frequently asked questions
What is the warmest month in Viseu?
August is the warmest month in Viseu, with an average high of 31 °C (87 °F) and an average low of 14 °C (56 °F).
What is the coldest month in Viseu?
January is the coldest month, with an average high of 11 °C (51 °F) and an average low of 2 °C (36 °F).
When does it rain the most in Viseu?
October is the wettest month with about 139 mm (5.5 in) of precipitation; July is the driest with about 12 mm (0.5 in).
What is the best time to visit Viseu?
Judging by long-term averages, the most comfortable months are May and June and September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 334 m, while Viseu lies at about 469 m. Temperatures on this page were therefore adjusted by −0.9 °C1.6 °F using the standard lapse rate of 6.5 °C per 1,000 m.