Basel in September
6.9out of 10
Possible, with caveats
Mild: highs around 19°C. Frequent rain: about 13 rainy days.
19°CAvg high
10°CAvg low
13Rainy days (95 mm)
12:19 hDaylight
07:14Sunrise · 19:34 Sunset
Why this score
- Mild: highs around 19°C
- Frequent rain: about 13 rainy days
- Rain varies a lot between years (±4.2 days)
What to wear and pack
- Layers you can add or remove
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±4.2 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 4°C | -1°C | 80 mm | 13 | – | – | 4.2 |
| February | 6°C | -1°C | 73 mm | 12 | – | – | 4.7 |
| March | 10°C | 2°C | 83 mm | 14 | – | – | 5.3 |
| April | 14°C | 5°C | 90 mm | 14 | – | – | 5.9 |
| May | 18°C | 9°C | 129 mm | 17 | – | – | 6.0 |
| June | 22°C | 12°C | 117 mm | 16 | – | – | 6.8 |
| July | 24°C | 14°C | 121 mm | 15 | – | – | 6.9 |
| August | 24°C | 14°C | 125 mm | 15 | – | – | 6.8 |
| September | 19°C | 10°C | 95 mm | 13 | – | – | 6.9 |
| October | 14°C | 6°C | 96 mm | 13 | – | – | 6.0 |
| November | 8°C | 2°C | 94 mm | 13 | – | – | 5.0 |
| December | 5°C | 0°C | 101 mm | 14 | – | – | 4.1 |
Frequently asked questions
How hot is Basel in September?
Daytime highs average 19°C and nights about 10°C.
When is the best time to visit Basel?
The best months are July, September, June, August.