Log visit
Portugal
Viseu weather by month
Historical averages 2016–2025 · not a forecast
Loading your weather period…
When is the best time to visit Viseu?
For a warm holiday, the best week has been 19–25 July (Weather Index 96). Several start dates remain plausible, and the best timing varies between years. August is warmest (29°C), August is driest and July has the most sun.
- Warmest
- August 29°C
- Coolest
- January and December 12°C
- Driest
- August 8% rain-day chance
- Wettest
- March 45% rain-day chance
- Sunniest
- July 14 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Viseu
Viseu historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 11.8 | 4.4 | 35.8 | 11.1 | 156.3 | 6.4 |
| February | 13.9 | 5.5 | 32.1 | 9.0 | 112.0 | 7.5 |
| March | 15.0 | 6.4 | 45.5 | 14.1 | 148.8 | 8.9 |
| April | 17.8 | 8.5 | 42.7 | 12.8 | 134.2 | 10.2 |
| May | 21.1 | 10.9 | 33.5 | 10.4 | 78.6 | 11.8 |
| June | 24.0 | 13.6 | 28.0 | 8.4 | 51.7 | 12.9 |
| July | 28.1 | 15.7 | 8.7 | 2.7 | 11.8 | 13.7 |
| August | 28.8 | 16.0 | 8.1 | 2.5 | 10.7 | 12.7 |
| September | 24.8 | 13.8 | 22.0 | 6.6 | 57.7 | 10.7 |
| October | 20.8 | 11.9 | 39.4 | 12.2 | 171.4 | 8.4 |
| November | 14.8 | 7.6 | 44.0 | 13.2 | 169.1 | 6.7 |
| December | 12.4 | 5.8 | 42.3 | 13.1 | 153.9 | 6.4 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.