Climate averages 1991–2020
Siegen weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Siegen: daytime highs average 17.6°C and nights cool to about 10.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 76 mm of rain on roughly 12 days, which makes September a moderately wet month (the joint 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 42 min on an average September day.
The nearest other city in this atlas is Lüdenscheid (47 km away). In September its highs average 16.7°C, 0.9°C cooler than Siegen, with 87 mm of rain.
Among the 120 cities listed in Germany, Siegen ranks joint 112th of 120 for the warmest September highs and joint 106th of 120 for the driest September (rainfall, lowest first). The mean September high of those 120 cities is 18.8°C; Siegen is 1.2°C cooler than that mean.
From September to October, average highs fall by 5.0°C to 12.7°C, and monthly rainfall rises from 76 mm to 80 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
Siegen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.2°C-1.4°C | -1.4°C | 100 | 14.6 | 8.58 h |
| February | 4.3°C-1.6°C | -1.6°C | 79 | 12.1 | 10.010 h |
| March | 8.3°C1.0°C | 1.0°C | 82 | 13.7 | 11.812 h |
| April | 13.1°C4.4°C | 4.4°C | 62 | 11.7 | 13.814 h |
| May | 16.9°C8.4°C | 8.4°C | 72 | 12.6 | 15.515 h |
| June | 19.9°C11.5°C | 11.5°C | 76 | 12.8 | 16.416 h |
| July | 21.9°C13.7°C | 13.7°C | 83 | 14.2 | 16.016 h |
| August | 21.6°C13.5°C | 13.5°C | 81 | 13.0 | 14.615 h |
| September, selected | 17.6°C10.4°C | 10.4°C | 76 | 11.6 | 12.713 h |
| October | 12.7°C6.8°C | 6.8°C | 80 | 12.9 | 10.811 h |
| November | 7.4°C3.0°C | 3.0°C | 85 | 13.4 | 9.09 h |
| December | 4.0°C0.0°C | 0.0°C | 109 | 15.8 | 8.08 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
- Lüdenscheid in SeptemberGermany · 47 kmHigh 16.7°C · Low 9.9°C · 87 mm rain
- Marburg an der Lahn in SeptemberGermany · 53 kmHigh 18.4°C · Low 10.3°C · 56 mm rain
- Gießen in SeptemberGermany · 56 kmHigh 18.9°C · Low 10.8°C · 55 mm rain
- Arnsberg in SeptemberGermany · 57 kmHigh 17.3°C · Low 10.3°C · 70 mm rain
- Iserlohn in SeptemberGermany · 60 kmHigh 17.5°C · Low 10.6°C · 72 mm rain
- Troisdorf in SeptemberGermany · 62 kmHigh 19.2°C · Low 11.5°C · 68 mm rain
- Bergisch Gladbach in SeptemberGermany · 64 kmHigh 18.9°C · Low 11.5°C · 80 mm rain
- Koblenz in SeptemberGermany · 66 kmHigh 19.4°C · Low 11.4°C · 55 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 Siegen) is explained once on the Siegen year overview and on the Sources, method and limits page.