Interlaken
Switzerland · Europe
Year-round range: 26°F to 75°F
September
Excellent conditions this month
Your monthly fit score
Comfort fit by month.
Climate details▼
Temperature
Average highs and lows.
September has comfortable temperatures — not too hot, not too cold.
Shaded band = typical daily swing (P10 of night lows to P90 of afternoon peaks) — spans wider than avg high/low lines because it captures day-to-day variation.
| = SepPrecipitation
Monthly precipitation, wet-day risk, and snow signal where relevant.
September has a meaningful snow signal — treat wet days as snow or mixed precipitation, not just rain.
Sunshine
Average hours of bright sun per day.
September has decent sunshine — a mix of sun and cloud.
Clear sky
Clear-sky share is the inverse of average cloud cover (100% minus cloud cover). Band labels follow standard meteorological categories; distribution within each band varies by day.
Air comfort by month
Humidity and heat feel by month.
September is mostly comfortable — low heat and humidity pressure.
Time-of-day patterns
Typical hourly rhythm for September.
Temperature by hour
Temperature by hour and month
Typical temperature through the day across the year (1996-2025 normals, local time). Shaded cells are nighttime.
In September, afternoons reach about 67° and nights settle near 54°.
▶Full month-by-month data
| Month | High °F | Low °F | Rain days | Rain (in) | Sun h/day | Humidity |
|---|---|---|---|---|---|---|
| Jan | 40°F | 26°F | 10 | 3.1in | 3.2h | 79.14285714285714% |
| Feb | 44°F | 28°F | 9 | 2.6in | 4h | 76% |
| Mar | 49°F | 33°F | 10 | 3.1in | 4.7h | 75.42857142857142% |
| Apr | 55°F | 39°F | 11 | 3.5in | 5.3h | 76.42857142857143% |
| May | 63°F | 46°F | 19 | 5.2in | 5h | 79.71428571428571% |
| Jun | 72°F | 54°F | 19 | 5.5in | 6.5h | 78.42857142857142% |
| Jul | 75°F | 58°F | 19 | 6.3in | 6.8h | 78.57142857142857% |
| Aug | 75°F | 58°F | 13 | 5.9in | 6.2h | 79.42857142857143% |
| Sep | 68°F | 51°F | 11 | 4.3in | 4.9h | 81.99999999999999% |
| Oct | 61°F | 44°F | 10 | 3.3in | 4.1h | 81.99999999999999% |
| Nov | 49°F | 35°F | 11 | 3.5in | 3.1h | 83.85714285714286% |
| Dec | 42°F | 30°F | 11 | 3.9in | 3h | 81.28571428571429% |
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Planning notes
Expect some rain.