Climate averages 1991–2020
Viseu weather
in May.
A mild, wet month: the 5th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Viseu: daytime highs average 20.0°C and nights cool to about 9.9°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 98 mm of rain on roughly 12 days, which makes May a wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 25 min on an average May day.
The nearest other city in this atlas is Aveiro (62 km away). In May its highs average 21.2°C, 1.3°C warmer than Viseu, with 79 mm of rain.
Among the 12 cities listed in Portugal, Viseu ranks 9th of 12 for the warmest May highs and 10th of 12 for the driest May (rainfall, lowest first). The mean May high of those 12 cities is 20.6°C; Viseu is 0.7°C cooler than that mean.
From May to June, average highs rise by 4.3°C to 24.2°C, and monthly rainfall falls from 98 mm to 40 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Viseu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.5°C3.1°C | 3.1°C | 152 | 11.6 | 9.610 h |
| February | 12.0°C3.4°C | 3.4°C | 102 | 9.3 | 10.611 h |
| March | 15.0°C5.4°C | 5.4°C | 115 | 10.6 | 11.912 h |
| April | 16.6°C7.1°C | 7.1°C | 118 | 12.8 | 13.313 h |
| May, selected | 20.0°C9.9°C | 9.9°C | 98 | 11.6 | 14.414 h |
| June | 24.2°C13.1°C | 13.1°C | 40 | 6.2 | 15.015 h |
| July | 27.6°C15.4°C | 15.4°C | 19 | 3.6 | 14.815 h |
| August | 27.9°C15.8°C | 15.8°C | 26 | 4.6 | 13.814 h |
| September | 24.3°C13.7°C | 13.7°C | 66 | 7.1 | 12.513 h |
| October | 18.9°C10.5°C | 10.5°C | 168 | 12.2 | 11.211 h |
| November | 13.6°C6.4°C | 6.4°C | 150 | 12.7 | 10.010 h |
| December | 11.1°C4.1°C | 4.1°C | 160 | 11.6 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Aveiro in MayPortugal · 62 kmHigh 21.2°C · Low 12.7°C · 79 mm rain
- Coimbra in MayPortugal · 67 kmHigh 22.0°C · Low 11.5°C · 73 mm rain
- Porto in MayPortugal · 80 kmHigh 20.1°C · Low 12.3°C · 101 mm rain
- Braga in MayPortugal · 108 kmHigh 19.9°C · Low 10.2°C · 121 mm rain
- Leiria in MayPortugal · 127 kmHigh 21.4°C · Low 12.7°C · 63 mm rain
- Cáceres, Spain in MaySpain · 186 kmHigh 23.1°C · Low 12.2°C · 43 mm rain
- Ourense in MaySpain · 186 kmHigh 20.3°C · Low 10.1°C · 72 mm rain
- Vigo in MaySpain · 187 kmHigh 18.6°C · Low 11.4°C · 118 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Viseu) is explained once on the Viseu year overview and on the Sources, method and limits page.