Viana do Castelo Climate by Month
Viana do Castelo, Portugal
Mild summers and mild winters, with rain spread through the year.
The climate in Viana do Castelo is one of mild summers and mild winters, with rain spread through the year. Afternoon highs range from 57°F (14°C) in December to 74°F (24°C) in July, and February nights average 44°F (7°C). About 57 in (1443 mm) of rain falls in a typical year, with no clear rainy season. The air is humid, averaging 80% relative humidity.
- Warmest month
- 74°F(24°C)
- Average high, July
- Coldest nights
- 44°F(7°C)
- Average low, February
- Rain per year
- 57 in(1443 mm)
- No clear rainy season
- Humidity
- 80%
- Sunniest: July
Best and worst months in Viana do Castelo
Best for weatherThe most comfortable weather comes in July and August, with highs around 74°F (24°C) and about 1.3 in (34 mm) of rain a month.
Least pleasantDecember is the least pleasant month: it's the coldest, with highs of only 57°F (14°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Viana do Castelo weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 57°F(14°C) | 44°F(7°C) | 7.0 in(178 mm) | 80% | 1.7 |
| FebFebruary | 58°F(14°C) | 44°F(7°C) | 4.7 in(120 mm) | 79% | 2.6 |
| MarMarch | 61°F(16°C) | 47°F(8°C) | 4.9 in(124 mm) | 77% | 3.4 |
| AprApril | 64°F(18°C) | 49°F(9°C) | 4.9 in(125 mm) | 78% | 4.9 |
| MayMay | 67°F(20°C) | 54°F(12°C) | 3.5 in(90 mm) | 78% | 5.8 |
| JunJune | 72°F(22°C) | 57°F(14°C) | 1.9 in(47 mm) | 77% | 6.7 |
| JulJulyBest | 74°F(24°C) | 59°F(15°C) | 1.2 in(31 mm) | 81% | 6.7 |
| AugAugustBest | 74°F(24°C) | 59°F(15°C) | 1.5 in(37 mm) | 81% | 5.8 |
| SepSeptember | 72°F(22°C) | 57°F(14°C) | 3.1 in(78 mm) | 81% | 4.5 |
| OctOctober | 69°F(21°C) | 55°F(13°C) | 7.9 in(200 mm) | 80% | 3.0 |
| NovNovember | 61°F(16°C) | 48°F(9°C) | 8.1 in(205 mm) | 83% | 1.9 |
| DecDecember | 57°F(14°C) | 44°F(7°C) | 8.2 in(208 mm) | 88% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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