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Viseu, Portugal climate
Csb Warm-summer Mediterranean
Viseu has a seasonal mild-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is August with an average daily high near 28°C, while the coldest is January averaging around 4°C at night. Precipitation totals about 1121 mm a year and is strongly seasonal — December alone averages 164 mm while July barely receives 15 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Viseu climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 16 | 20 | 24 | 28 | 28 | 25 | 19 | 13 | 11 |
| Avg temp (°C) | 7 | 8 | 10 | 12 | 15 | 18 | 21 | 22 | 19 | 15 | 10 | 8 |
| Avg low (°C) | 4 | 4 | 6 | 7 | 10 | 13 | 14 | 15 | 14 | 11 | 7 | 5 |
| Precipitation (mm) | 144 | 96 | 124 | 116 | 70 | 31 | 15 | 22 | 55 | 152 | 133 | 164 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 16 | 20 | 24 |
| Avg temp (°C) | 7 | 8 | 10 | 12 | 15 | 18 |
| Avg low (°C) | 4 | 4 | 6 | 7 | 10 | 13 |
| Precipitation (mm) | 144 | 96 | 124 | 116 | 70 | 31 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 25 | 19 | 13 | 11 |
| Avg temp (°C) | 21 | 22 | 19 | 15 | 10 | 8 |
| Avg low (°C) | 14 | 15 | 14 | 11 | 7 | 5 |
| Precipitation (mm) | 15 | 22 | 55 | 152 | 133 | 164 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 54 | 55 | 61 | 56 | 44 | 30 | 32 | 44 | 55 | 58 | 61 |
| Relative humidity (%) | 88 | 84 | 80 | 78 | 74 | 64 | 54 | 53 | 61 | 74 | 86 | 88 |
| Wind speed (mph) | 0.4 | 0.4 | 0.4 | 0.4 | 0.3 | 0.3 | 0.2 | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 54 | 55 | 61 | 56 | 44 |
| Relative humidity (%) | 88 | 84 | 80 | 78 | 74 | 64 |
| Wind speed (mph) | 0.4 | 0.4 | 0.4 | 0.4 | 0.3 | 0.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 30 | 32 | 44 | 55 | 58 | 61 |
| Relative humidity (%) | 54 | 53 | 61 | 74 | 86 | 88 |
| Wind speed (mph) | 0.2 | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Viseu, a weather station, about 7 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.