Climate averages 1991–2020
Ulm weather
in September.
A mild, moderately wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Ulm: daytime highs average 18.4°C and nights cool to about 10.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 69 mm of rain on roughly 11 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 38 min on an average September day.
The nearest other city in this atlas is Reutlingen (59 km away). In September its highs average 19.1°C, 0.7°C warmer than Ulm, with 66 mm of rain.
Among the 120 cities listed in Germany, Ulm ranks joint 86th of 120 for the warmest September highs and joint 84th of 120 for the driest September (rainfall, lowest first). The mean September high of those 120 cities is 18.8°C; Ulm is 0.4°C cooler than that mean.
From September to October, average highs fall by 4.8°C to 13.6°C, and monthly rainfall falls from 69 mm to 67 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
Ulm climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.4°C-2.7°C | -2.7°C | 61 | 11.7 | 8.89 h |
| February | 4.9°C-2.8°C | -2.8°C | 51 | 10.4 | 10.210 h |
| March | 9.2°C0.4°C | 0.4°C | 66 | 12.4 | 11.912 h |
| April | 13.7°C3.9°C | 3.9°C | 62 | 11.3 | 13.614 h |
| May | 17.6°C8.3°C | 8.3°C | 95 | 14.4 | 15.215 h |
| June | 20.9°C11.9°C | 11.9°C | 96 | 14.5 | 16.016 h |
| July | 22.9°C13.9°C | 13.9°C | 99 | 14.5 | 15.716 h |
| August | 22.9°C13.9°C | 13.9°C | 88 | 13.4 | 14.314 h |
| September, selected | 18.4°C10.0°C | 10.0°C | 69 | 11.3 | 12.613 h |
| October | 13.6°C6.1°C | 6.1°C | 67 | 11.4 | 10.911 h |
| November | 7.6°C1.5°C | 1.5°C | 64 | 10.9 | 9.39 h |
| December | 3.9°C-1.5°C | -1.5°C | 68 | 13.0 | 8.48 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
- Reutlingen in SeptemberGermany · 59 kmHigh 19.1°C · Low 10.3°C · 66 mm rain
- Esslingen in SeptemberGermany · 63 kmHigh 19.8°C · Low 10.8°C · 62 mm rain
- Augsburg in SeptemberGermany · 67 kmHigh 18.6°C · Low 10.1°C · 82 mm rain
- Tübingen in SeptemberGermany · 71 kmHigh 19.2°C · Low 10.4°C · 63 mm rain
- Stuttgart in SeptemberGermany · 74 kmHigh 19.7°C · Low 10.8°C · 62 mm rain
- Ludwigsburg in SeptemberGermany · 81 kmHigh 19.3°C · Low 10.6°C · 63 mm rain
- Heilbronn in SeptemberGermany · 100 kmHigh 20.0°C · Low 11.6°C · 63 mm rain
- Konstanz in SeptemberGermany · 102 kmHigh 18.8°C · Low 12.9°C · 94 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 Ulm) is explained once on the Ulm year overview and on the Sources, method and limits page.