Bern weather in September
September is one of the best months to visit Bern: highs of 18°C (65°F) and about 83 mm (3.3 in) of rain on average. Nights average 9°C (48°F) and cloud cover 60% (NASA POWER, 2001–2025 averages). It is the 5th driest month of the year and the 4th warmest. Compared with August, it is cooler and drier; October brings highs of 14°C (57°F) and 94 mm (3.7 in) of rain.
Figures are long-term averages for Bern, the largest city in Bern. See below for other places.
Is September a good time to visit Bern?
best month Weather score 69/100.
Yes. September is one of the best months for weather in Bern.
Does it rain a lot in Bern in September?
Some rain is normal: about 83 mm (3.3 in) falls in an average September. It is the 5th driest month of the year.
How warm is Bern in September?
Days average 18°C (65°F) and nights 9°C (48°F).
Bern weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 2°C (36°F) | -4°C (25°F) | 77 mm | 76% | least pleasant |
| February | 4°C (38°F) | -4°C (25°F) | 62 mm | 74% | least pleasant |
| March | 8°C (47°F) | -1°C (31°F) | 80 mm | 70% | least pleasant |
| April | 13°C (55°F) | 3°C (38°F) | 83 mm | 69% | fair |
| May | 17°C (62°F) | 7°C (45°F) | 130 mm | 73% | fair |
| June | 21°C (70°F) | 12°C (53°F) | 117 mm | 66% | best |
| July | 23°C (73°F) | 13°C (56°F) | 121 mm | 59% | best |
| August | 22°C (72°F) | 13°C (55°F) | 126 mm | 60% | best |
| September | 18°C (65°F) | 9°C (48°F) | 83 mm | 60% | best |
| October | 14°C (57°F) | 5°C (41°F) | 94 mm | 68% | fair |
| November | 8°C (46°F) | 0°C (33°F) | 82 mm | 75% | least pleasant |
| December | 3°C (38°F) | -3°C (27°F) | 87 mm | 76% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Bern in September
Weather can differ a lot within Bern: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Bern | 18°C (65°F) | 9°C (48°F) | 83 mm | best |
| Interlaken | 12°C (54°F) | 3°C (38°F) | 106 mm | best |
| Biel/Bienne | 18°C (65°F) | 9°C (48°F) | 83 mm | best |
| Thun | 18°C (65°F) | 9°C (48°F) | 83 mm | best |
| Köniz | 18°C (65°F) | 9°C (48°F) | 83 mm | best |
| Burgdorf | 18°C (65°F) | 9°C (48°F) | 83 mm | best |
| Steffisburg | 18°C (65°F) | 9°C (48°F) | 83 mm | best |