Viana do Castelo Climate: Weather by Month and Best Time to Visit
Best months for Viana do Castelo: July, August, June, September.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 13°C | 7°C | 218 mm | 14 | – | – | 5.1 |
| February | 14°C | 7°C | 143 mm | 10 | – | – | 6.1 |
| March | 15°C | 8°C | 165 mm | 11 | – | – | 6.2 |
| April | 16°C | 10°C | 154 mm | 13 | – | – | 6.1 |
| May | 19°C | 12°C | 133 mm | 12 | – | – | 6.7 |
| June | 21°C | 14°C | 56 mm | 7 | – | – | 8.1 |
| July | 23°C | 16°C | 32 mm | 4 | – | – | 8.5 |
| August | 24°C | 16°C | 45 mm | 5 | – | – | 8.4 |
| September | 22°C | 15°C | 89 mm | 7 | – | – | 8.1 |
| October | 19°C | 12°C | 232 mm | 13 | – | – | 6.2 |
| November | 15°C | 9°C | 232 mm | 14 | – | – | 5.4 |
| December | 13°C | 8°C | 227 mm | 14 | – | – | 5.2 |