Climate averages 1991–2020
Viseu weather
in August.
A warm, fairly dry month: the warmest and the 2nd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Viseu: daytime highs average 27.9°C and nights cool to about 15.8°C. By daytime temperature it is the warmest month of the year.
Expect about 26 mm of rain on roughly 5 days, which makes August a fairly dry month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 47 min on an average August day.
The nearest other city in this atlas is Aveiro (62 km away). In August its highs average 27.3°C, 0.6°C cooler than Viseu, with 17 mm of rain.
Among the 12 cities listed in Portugal, Viseu ranks 3rd of 12 for the warmest August highs and 10th of 12 for the driest August (rainfall, lowest first). The mean August high of those 12 cities is 26.8°C; Viseu is 1.1°C warmer than that mean.
From August to September, average highs fall by 3.5°C to 24.3°C, and monthly rainfall rises from 26 mm to 66 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Aveiro in AugustPortugal · 62 kmHigh 27.3°C · Low 17.2°C · 17 mm rain
- Coimbra in AugustPortugal · 67 kmHigh 28.9°C · Low 16.5°C · 14 mm rain
- Porto in AugustPortugal · 80 kmHigh 26.2°C · Low 17.2°C · 29 mm rain
- Braga in AugustPortugal · 108 kmHigh 26.4°C · Low 15.4°C · 39 mm rain
- Leiria in AugustPortugal · 127 kmHigh 27.1°C · Low 16.9°C · 9.6 mm rain
- Cáceres, Spain in AugustSpain · 186 kmHigh 32.4°C · Low 19.7°C · 6.5 mm rain
- Ourense in AugustSpain · 186 kmHigh 27.1°C · Low 15.4°C · 27 mm rain
- Vigo in AugustSpain · 187 kmHigh 23.9°C · Low 16.1°C · 49 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.