Average weather, temperature, rainfall, sunshine hours
The climate of Viana do Castelo is
temperate oceanic, with mild, rainy winters and pleasantly warm, sunny summers.
The city is located in the extreme north-west of Portugal, on the coast.
The
average temperature of the coldest month (January) is of 9.5 °C (49 °F), that of the warmest month (July) is of 20.6 °C (69 °F). The lowest record (of the 1971/2000 period) is -4 °C (25 °F), the highest is 38.6 °C (101 °F). Here are the average temperatures.
Viana do Castelo - Average temperatures| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|
| Min (°C) | 5 | 6 | 7 | 9 | 11 | 13 | 15 | 15 | 13 | 11 | 8 | 6 |
|---|
| Max (°C) | 14 | 15 | 17 | 18 | 20 | 24 | 26 | 26 | 24 | 21 | 17 | 15 |
|---|
| Min (°F) | 41 | 43 | 45 | 48 | 52 | 55 | 59 | 59 | 55 | 52 | 46 | 43 |
|---|
| Max (°F) | 57 | 59 | 63 | 64 | 68 | 75 | 79 | 79 | 75 | 70 | 63 | 59 |
|---|
amounts to 1,470 millimeters (57.9 inches) per year: it is therefore abundant. It ranges from 30 mm (1.2 in) in the driest months (July, August) to 230 mm (9.1 in) in the wettest (December). Here is the average precipitation.
Viana do Castelo - Average precipitation| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|
| Prec.(mm) | 190 | 170 | 105 | 120 | 105 | 55 | 30 | 30 | 95 | 165 | 180 | 230 | 1470 |
|---|
| Prec.(in) | 7.5 | 6.7 | 4.1 | 4.7 | 4.1 | 2.2 | 1.2 | 1.2 | 3.7 | 6.5 | 7.1 | 9.1 | 57.9 |
|---|
| Days | 14 | 13 | 10 | 12 | 11 | 7 | 4 | 4 | 6 | 12 | 12 | 14 | 120 |
|---|
On average, there are around 2,500
sunshine hours per year: therefore, the amount of sunshine is good. Here are the average sunshine hours per day.
Viana do Castelo - Sunshine| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|
| Hours | 4 | 4 | 6 | 7 | 8 | 10 | 10 | 10 | 8 | 6 | 5 | 4 |
|---|
The
sea temperature ranges between 14 °C (57 °F) and 19 °C (66 °F). So, it never becomes warm for swimming. Here are the average sea temperatures.
Viana do Castelo - Sea temperature| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|
| Temp (°C) | 14 | 14 | 14 | 14 | 16 | 17 | 18 | 19 | 18 | 18 | 16 | 15 |
|---|
| Temp (°F) | 57 | 57 | 57 | 57 | 61 | 63 | 64 | 66 | 64 | 64 | 61 | 59 |
|---|
Best Time
The
best time to visit Viana do Castelo runs from June to September, since it is the warmest and the least rainy period of the year. July and August are the warmest months, but the heat is rarely excessive, and in addition, they are the driest. However, in September too, the rains are still quite rare, at least in the first half. In May, you can go, but cool and rainy days are more frequent.
Even in summer, it's better to bring a sweatshirt, and maybe a light jacket for the evening.