Temperature
Cool by day, cold at night.
59°Ftypical September high
Typical range
Cool days and some sun.
Cool by day, cold at night.
Some precipitation is expected this month.
Cloudier spells limit sunshine.
In September, afternoons feel about 56° and nights feel near 43°.
Mostly cloudy skies this month.
Calm winds are typical in September.
September late afternoons are around 58°F, easing to about 54°F in early evening.
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 27 | 15 | 3.6 | 12 | 6.6 | 71 |
| Feb | 31 | 17 | 3.0 | 11 | 7.9 | 70 |
| Mar | 37 | 24 | 3.9 | 13 | 9.3 | 71 |
| Apr | 44 | 31 | 5.5 | 15 | 10.4 | 76 |
| May | 52 | 39 | 7.4 | 19 | 10.9 | 80 |
| Jun | 62 | 47 | 7.1 | 20 | 11.9 | 78 |
| Jul | 66 | 50 | 7.4 | 19 | 12.5 | 77 |
| Aug | 66 | 50 | 7.2 | 19 | 11.1 | 79 |
| Sep | 59 | 43 | 5.3 | 16 | 9.6 | 82 |
| Oct | 50 | 36 | 5.4 | 13 | 8.0 | 82 |
| Nov | 37 | 24 | 6.3 | 14 | 6.4 | 78 |
| Dec | 29 | 17 | 4.1 | 13 | 6.0 | 73 |
Similar climates
Want a side-by-side climate view? Compare Zermatt with Courmayeur.
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jul 31, 2026
Data & methodology