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Viana do Castelo Weather in April
In Viana do Castelo, April brings moderate daytime temperatures around 17°C (63°F), with nights cooling to 11°C (52°F). Expect quite a bit of rainfall this month.
Rainfall in Viana do Castelo in April
Historically, April sees about 16 days of rain, with a monthly average of 150 mm (5.9 in). This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Viana do Castelo in April
Expect highs of 17°C (63°F) in Viana do Castelo in April, with nights dropping to around 11°C (52°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Viana do Castelo in April
The month enjoys around 218 hours of sunshine, creating mostly sunny days with good weather conditions.If you prefer dry days with pleasant temperatures, June, July, August and September typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Viana do Castelo Temperature in April
Min Temperature
11°C (52°F)
Max Temperature
17°C (63°F)
Chance of Rain
52%
Precipitation
150 mm (5.9 in)
Rainy days
16 days
Humidity
74% *
Sunshine
218 hours *
Percentage Sunshine
62% *
* Data from: Porto, Portugal (52 KM, 32 Miles).
Viana do Castelo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Viana do Castelo - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Viana do Castelo typically stay consistent throughout April, with daily highs averaging around 17°C (63°F). Nights are cool, with lows around 9°C (48°F).
Average temperatures in April
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in April
Historical weather records for Viana do Castelo in April
Browse day-by-day weather records for Viana do Castelo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Viana do Castelo historical weather extremes in April
The extremes listed below come from historical weather data collected in Viana do Castelo from 1976 through 2026.
- On April 6, 2011, temperatures climbed to 31°C (88°F), marking the warmest April day on record.
- Viana do Castelo experienced its chilliest April day on April 3, 1987, reaching only 8°C (46°F).
- Nighttime temperatures dropped to 0°C (32°F) on April 9, 1986, marking the coldest April night on record.
Best Places in Portugal in April
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in April →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Viana do Castelo in April
Pleasant temperatures in April mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Viana do Castelo in April
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling5/10 -
Walking5/10 -
Camping6/10 -
Outdoor sports9/10
Viana do Castelo 3-Day Forecast
More climate data for Viana do Castelo
Temperature Rainfall Sunshine Humidity
See the full Viana do Castelo climate overview or explore weather in Portugal.
Popular in April
Where to go in April - average daytime high across popular destinations.
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