Climate averages 1991–2020
Basel weather
in August.
A warm, wet month: one of the warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Basel: daytime highs average 24.5°C and nights cool to about 14.9°C. By daytime temperature it is one of the warmest months of the year.
Expect about 125 mm of rain on roughly 15 days, which makes August a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 16 min on an average August day.
The nearest other city in this atlas is Mulhouse (28 km away). In August its highs average 24.3°C, about as warm as Basel, with 80 mm of rain.
Among the 8 cities listed in Switzerland, Basel ranks 1st of 8 for the warmest August highs and 5th of 8 for the driest August (rainfall, lowest first). The mean August high of those 8 cities is 22.9°C; Basel is 1.6°C warmer than that mean.
From August to September, average highs fall by 4.5°C to 20.1°C, and monthly rainfall falls from 125 mm to 95 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Basel climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.4°C-1.7°C | -1.7°C | 80 | 13.5 | 8.99 h |
| February | 6.9°C-1.5°C | -1.5°C | 73 | 11.7 | 10.210 h |
| March | 11.1°C1.4°C | 1.4°C | 83 | 13.5 | 11.912 h |
| April | 15.0°C4.6°C | 4.6°C | 90 | 14.1 | 13.614 h |
| May | 18.7°C8.9°C | 8.9°C | 129 | 16.8 | 15.115 h |
| June | 22.3°C12.7°C | 12.7°C | 118 | 15.8 | 15.916 h |
| July | 24.5°C14.8°C | 14.8°C | 121 | 15.4 | 15.616 h |
| August, selected | 24.5°C14.9°C | 14.9°C | 125 | 15.1 | 14.314 h |
| September | 20.1°C10.8°C | 10.8°C | 95 | 12.6 | 12.613 h |
| October | 15.4°C6.7°C | 6.7°C | 97 | 13.2 | 10.911 h |
| November | 9.4°C2.1°C | 2.1°C | 94 | 13.0 | 9.49 h |
| December | 5.8°C-0.8°C | -0.8°C | 101 | 14.1 | 8.59 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Mulhouse in AugustFrance · 28 kmHigh 24.3°C · Low 15.1°C · 80 mm rain
- Freiburg in AugustGermany · 53 kmHigh 24.4°C · Low 15.6°C · 81 mm rain
- Bern in AugustSwitzerland · 69 kmHigh 21.8°C · Low 13.1°C · 101 mm rain
- Zürich in AugustSwitzerland · 76 kmHigh 23.2°C · Low 15.0°C · 147 mm rain
- Luzern in AugustSwitzerland · 79 kmHigh 23.0°C · Low 15.2°C · 211 mm rain
- Winterthur in AugustSwitzerland · 87 kmHigh 23.1°C · Low 14.6°C · 107 mm rain
- Villingen-Schwenningen in AugustGermany · 89 kmHigh 21.2°C · Low 12.7°C · 124 mm rain
- Strasbourg in AugustFrance · 115 kmHigh 24.5°C · Low 15.3°C · 76 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Basel) is explained once on the Basel year overview and on the Sources, method and limits page.