Valais weather in August
August is one of the best months to visit Valais: highs of 14°C (58°F) and about 99 mm (3.9 in) of rain on average. Nights average 5°C (41°F) and cloud cover 60% (NASA POWER, 2001–2025 averages). It is the 2nd wettest month of the year and the 2nd warmest. Compared with July, it is about as warm and about as wet; September brings highs of 11°C (51°F) and 68 mm (2.7 in) of rain.
Figures are long-term averages for Sitten, the largest city in Valais. See below for other places.
Is August a good time to visit Valais?
best month Weather score 54/100.
Yes. August is one of the best months for weather in Valais.
Does it rain a lot in Valais in August?
Some rain is normal: about 99 mm (3.9 in) falls in an average August. It is the 2nd wettest month of the year.
How warm is Valais in August?
Days average 14°C (58°F) and nights 5°C (41°F).
Valais weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | -6°C (22°F) | -14°C (6°F) | 63 mm | 76% | least pleasant |
| February | -5°C (23°F) | -14°C (6°F) | 50 mm | 74% | least pleasant |
| March | -2°C (28°F) | -10°C (13°F) | 63 mm | 70% | least pleasant |
| April | 3°C (37°F) | -5°C (23°F) | 70 mm | 69% | least pleasant |
| May | 8°C (47°F) | -1°C (31°F) | 109 mm | 73% | least pleasant |
| June | 13°C (55°F) | 4°C (38°F) | 97 mm | 66% | best |
| July | 15°C (58°F) | 5°C (41°F) | 96 mm | 59% | best |
| August | 14°C (58°F) | 5°C (41°F) | 99 mm | 60% | best |
| September | 11°C (51°F) | 1°C (34°F) | 68 mm | 60% | fair |
| October | 6°C (43°F) | -2°C (28°F) | 72 mm | 68% | least pleasant |
| November | 0°C (31°F) | -8°C (18°F) | 91 mm | 75% | least pleasant |
| December | -5°C (24°F) | -13°C (9°F) | 68 mm | 76% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Valais in August
Weather can differ a lot within Valais: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Sitten | 14°C (58°F) | 5°C (41°F) | 99 mm | best |
| Zermatt | 14°C (58°F) | 5°C (41°F) | 99 mm | best |
| Martigny-Ville | 18°C (64°F) | 8°C (46°F) | 105 mm | best |
| Monthey | 21°C (70°F) | 12°C (53°F) | 120 mm | best |
| Sierre | 18°C (64°F) | 9°C (47°F) | 132 mm | best |