Monthly climate guide
Viana do Castelo weather in April
April in Viana do Castelo is typically mild, with average daytime highs around 17°C (63°F) and night-time lows near 10°C (50°F). The month usually brings about 104 mm of rain (wet) and is a mix of sun and cloud. Daytime highs are 2°C warmer than March and 3°C cooler than May.
What stands out in April
- In Viana do Castelo, April is mid-spring.
- Just 350 km apart, but Viana do Castelo runs about 3°C cooler than Setúbal this month.
Avg high
17°C
63°F
Avg low
10°C
50°F
Rainfall
104 mm
wet
Humidity
81%
relative
Sky
52%
cloud · a mix of sun and cloud
Viana do Castelo weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 13°C / 55°F | 7°C / 45°F | 141 mm | 87% | 54% |
| February | 14°C / 56°F | 7°C / 45°F | 102 mm | 84% | 51% |
| March | 15°C / 60°F | 8°C / 47°F | 111 mm | 81% | 49% |
| April | 17°C / 63°F | 10°C / 50°F | 104 mm | 81% | 52% |
| May | 20°C / 68°F | 12°C / 54°F | 70 mm | 78% | 43% |
| June | 22°C / 72°F | 14°C / 57°F | 34 mm | 74% | 41% |
| July | 26°C / 78°F | 16°C / 60°F | 13 mm | 69% | 28% |
| August | 26°C / 78°F | 16°C / 61°F | 25 mm | 69% | 30% |
| September | 25°C / 77°F | 16°C / 60°F | 52 mm | 69% | 34% |
| October | 21°C / 70°F | 14°C / 56°F | 120 mm | 76% | 46% |
| November | 16°C / 61°F | 10°C / 50°F | 152 mm | 84% | 53% |
| December | 14°C / 57°F | 8°C / 47°F | 132 mm | 86% | 54% |
What to pack for April
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is April a good time to visit Viana do Castelo?
Compare the months in the chart above to find your ideal window.
Best time to visit Viana do Castelo →Other Portugal cities in April
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Viana do Castelo weather in April. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/portugal/viana-do-castelo/april
<a href="https://weathercompare.eu/weather/portugal/viana-do-castelo/april">Viana do Castelo weather in April</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/portugal/viana-do-castelo" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Viana do Castelo weather in April"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/portugal/viana-do-castelo/april">Viana do Castelo weather in April</a> – WeatherCompare</p>
Viana do Castelo in April: quick answers
Is April a good time to visit Viana do Castelo?
April is one of the wetter months in Viana do Castelo, with about 104 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Viana do Castelo in April?
Average highs are about 17°C (63°F) and average lows about 10°C (50°F), based on 10 years of daily data.
Does it rain a lot in Viana do Castelo in April?
Viana do Castelo typically gets around 104 mm of rain in April — wet.
Figures are long-term averages for the area around Viana do Castelo (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.