Climate averages 1991–2020
Mannheim weather
in September.
A mild, moderately wet month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Mannheim: daytime highs average 20.4°C and nights cool to about 11.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 55 mm of rain on roughly 9 days, which makes September a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 40 min on an average September day.
The nearest other city in this atlas is Ludwigshafen am Rhein (2 km away). In September its highs average 20.5°C, about as warm as Mannheim, with 55 mm of rain.
Among the 120 cities listed in Germany, Mannheim ranks 3rd of 120 for the warmest September highs and joint 17th of 120 for the driest September (rainfall, lowest first). The mean September high of those 120 cities is 18.8°C; Mannheim is 1.6°C warmer than that mean.
From September to October, average highs fall by 5.4°C to 14.9°C, and monthly rainfall rises from 55 mm to 60 mm.
The annual picture
September 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
Mannheim climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.8°C-0.6°C | -0.6°C | 59 | 11.7 | 8.79 h |
| February | 6.5°C-0.3°C | -0.3°C | 51 | 10.2 | 10.110 h |
| March | 10.8°C2.3°C | 2.3°C | 57 | 11.2 | 11.912 h |
| April | 15.4°C5.5°C | 5.5°C | 44 | 9.9 | 13.714 h |
| May | 19.3°C9.9°C | 9.9°C | 67 | 11.6 | 15.315 h |
| June | 22.7°C13.4°C | 13.4°C | 57 | 10.7 | 16.216 h |
| July | 25.0°C15.7°C | 15.7°C | 61 | 10.9 | 15.816 h |
| August | 25.0°C15.6°C | 15.6°C | 53 | 9.8 | 14.414 h |
| September, selected | 20.4°C11.8°C | 11.8°C | 55 | 9.1 | 12.713 h |
| October | 14.9°C7.7°C | 7.7°C | 60 | 11.1 | 10.811 h |
| November | 9.0°C3.5°C | 3.5°C | 62 | 11.3 | 9.29 h |
| December | 5.4°C0.5°C | 0.5°C | 72 | 13.8 | 8.28 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
September in nearby cities
- Ludwigshafen am Rhein in SeptemberGermany · 2 kmHigh 20.5°C · Low 11.8°C · 55 mm rain
- Worms in SeptemberGermany · 18 kmHigh 20.2°C · Low 11.5°C · 51 mm rain
- Heidelberg, Germany in SeptemberGermany · 19 kmHigh 20.3°C · Low 11.7°C · 66 mm rain
- Darmstadt in SeptemberGermany · 45 kmHigh 19.8°C · Low 11.4°C · 61 mm rain
- Kaiserslautern in SeptemberGermany · 51 kmHigh 19.4°C · Low 11.7°C · 60 mm rain
- Karlsruhe in SeptemberGermany · 54 kmHigh 20.5°C · Low 12.0°C · 62 mm rain
- Mainz in SeptemberGermany · 56 kmHigh 20.0°C · Low 11.4°C · 54 mm rain
- Heilbronn in SeptemberGermany · 67 kmHigh 20.0°C · Low 11.6°C · 63 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 Mannheim) is explained once on the Mannheim year overview and on the Sources, method and limits page.
Ludwigshafen am Rhein lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.