Climate averages 1991–2020
Basel weather
in April.
A mild, wet month: the 7th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Basel: daytime highs average 15.0°C and nights cool to about 4.6°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 90 mm of rain on roughly 14 days, which makes April a wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 36 min on an average April day.
The nearest other city in this atlas is Mulhouse (28 km away). In April its highs average 14.7°C, about as warm as Basel, with 68 mm of rain.
Among the 8 cities listed in Switzerland, Basel ranks 1st of 8 for the warmest April highs and joint 2nd of 8 for the driest April (rainfall, lowest first). The mean April high of those 8 cities is 13.6°C; Basel is 1.4°C warmer than that mean.
From April to May, average highs rise by 3.7°C to 18.7°C, and monthly rainfall rises from 90 mm to 129 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Mulhouse in AprilFrance · 28 kmHigh 14.7°C · Low 5.0°C · 68 mm rain
- Freiburg in AprilGermany · 53 kmHigh 15.1°C · Low 5.6°C · 74 mm rain
- Bern in AprilSwitzerland · 69 kmHigh 12.5°C · Low 2.7°C · 90 mm rain
- Zürich in AprilSwitzerland · 76 kmHigh 14.1°C · Low 4.2°C · 106 mm rain
- Luzern in AprilSwitzerland · 79 kmHigh 13.8°C · Low 3.9°C · 135 mm rain
- Winterthur in AprilSwitzerland · 87 kmHigh 13.8°C · Low 4.0°C · 85 mm rain
- Villingen-Schwenningen in AprilGermany · 89 kmHigh 12.0°C · Low 2.8°C · 87 mm rain
- Strasbourg in AprilFrance · 115 kmHigh 15.2°C · Low 5.3°C · 60 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.