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Siegen Weather by Month
Average temperatures, rainfall and humidity for Siegen, Germany, month by month, built from OpenWeather’s historical records. Use it to see what a typical Siegen month looks like before you travel — then check the live Siegen forecast for the days ahead.
Warmest month
July
24°C average high
Coolest month
January
0°C average low
Wettest month
December
105 mm of rain
Driest month
April
55 mm of rain
Average temperature and rainfall in Siegen by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 5°C | 0°C | -14°C / 15°C | 92 mm | 90% | 14 km/h |
| February | 6°C | 1°C | -15°C / 19°C | 73 mm | 84% | 14 km/h |
| March | 10°C | 2°C | -12°C / 23°C | 62 mm | 76% | 14 km/h |
| April | 14°C | 4°C | -7°C / 27°C | 55 mm | 71% | 12 km/h |
| May | 18°C | 8°C | -2°C / 31°C | 57 mm | 73% | 11 km/h |
| June | 23°C | 12°C | 4°C / 37°C | 58 mm | 74% | 10 km/h |
| July | 24°C | 13°C | 5°C / 38°C | 87 mm | 73% | 10 km/h |
| August | 24°C | 13°C | 5°C / 36°C | 69 mm | 75% | 10 km/h |
| September | 19°C | 10°C | 0°C / 31°C | 65 mm | 80% | 11 km/h |
| October | 14°C | 7°C | -6°C / 31°C | 97 mm | 87% | 12 km/h |
| November | 9°C | 4°C | -8°C / 18°C | 98 mm | 90% | 13 km/h |
| December | 6°C | 2°C | -17°C / 15°C | 105 mm | 90% | 13 km/h |
Best time to visit Siegen
The most comfortable time to visit Siegen is generally June to August, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around December, totalling about 918 mm a year.
Travellers who prefer heat should aim for July, when highs average 24°C. December is the month to avoid if rain would spoil your plans — it averages 105 mm, roughly 2× the rainfall of the driest month (April).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Siegen forecast for what is happening now.