Viana do Castelo weather in July
Temperature, sea and sunshine in July: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in July
Good
Best time to visit: July – August
What is the weather like in Viana do Castelo in July?
In July, Viana do Castelo is warm: daytime highs average 23 °C, and nights cool down to about 17 °C. The sea averages 17.0 °C – bracing, so a wetsuit helps for longer swims. With around 10 hours of sunshine a day, there is plenty of sun. Rain is rare: about 4 days bring 23 mm in total. All in all, July is a good month for a holiday in Viana do Castelo.
July compared
How the weather changes from June to August. Tap a month to open it.
More details for July
- Daylight
- 14 h 56 min06:13 – 21:09
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 31 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1Europe/Lisbon
How the score comes together
- Temperatureweight 35 %58 %
- Seaweight 25 %0 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in July
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
Viana do Castelo in July: quick answers
Is Viana do Castelo hot in July?
Warm rather than hot: in July, daytime highs in Viana do Castelo average 23 °C and nights cool to about 17 °C.
Can you swim in Viana do Castelo in July?
Only if you don't mind cold water: in July the sea averages just 17.0 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Viana do Castelo in July?
Rain is rare: about 4 days bring 23 mm in total.
Viana do Castelo month by month
The whole year in Viana do CasteloAll destinations: PortugalWhere to go in JulySea temperature in July
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences