Month guide · Viseu, Portugal
Viseu in August: weather and what to expect
August is the warmest month of the year in Viseu. August highs in Viseu are now 2.1°C warmer than in 1991-2000. In August, Viseu averages highs of 28°C and lows of 16°C, with about 4 rainy days and 22 mm of rain. Crowds in Centro are at their peak.
Is August a good time to visit?
Good for
No verdicts for Viseu in August yet. They only use climate values that are precise enough to judge with.
Not ideal for
Nothing stands out as a weaker fit.
Daily highs through August
Town-level · ERA5-Land 1991-2020Highs fall about 1°C over the month. A day above 35°C happens in roughly 1 August in 2; nights below 10°C in about 1 in 5.
August in detail
Town-level · ERA5-LandCrowds, holidays and daylight
Public holidays in August 2027
- 15 Aug Assumption Day
Local (municipal) holidays are not included.
Warmer in August
Where is warm in August →| Place | High | Rain days | From Viseu |
|---|---|---|---|
| Castelo Branco (Centro), Centro | 31°C | 2 | 100 km |
| Alcains, Centro | 31°C | 2 | 91 km |
| Aldeia de Joanes, Centro | 31°C | 3 | 67 km |
| Sertã, Centro | 31°C | 3 | 97 km |
| Fundão, Centro | 30°C | 3 | 67 km |
The nearest towns with a warmer August. Distances are in a straight line.
How August is changing
Town-level · ERA5-LandAugust highs are 2.1°C warmer than in 1991-2000, and August rainfall is down about 60% (2016-2025 against 1991-2000). Days above 35°C in August went from 1.2 to 2.4 a year on average.
Questions about Viseu in August
How warm is Viseu in August?
Average highs are 28°C and lows 16°C. July averages 28°C and September 24°C.
Does it rain much in Viseu in August?
About 4 days have at least 1 mm of rain, with 22 mm in total over the month.
Is Viseu busy in August?
In August 2025, nights booked through online platforms in Centro were the busiest month of the year, which we count as peak. The figure is for the whole region and leaves out hotels.
How long are the days in Viseu in August?
About 13 h 50 min from sunrise to sunset in the middle of the month.
Sources
Climate: ERA5-Land, Copernicus Climate Change Service (C3S) Climate Data Store, contains modified Copernicus information (CC BY 4.0). Crowds: Eurostat, nights spent in short-stay accommodation booked through online platforms (tour_ce_omn12) (CC BY 4.0). Place names and populations: GeoNames (CC BY 4.0). Climate averages cover 1991-2020. Daylight: calculated from the town's coordinates. Full methodology