Climate averages 1991–2020
Wilhelmshaven weather
in September.
A mild, moderately wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Wilhelmshaven: daytime highs average 17.9°C and nights cool to about 11.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 67 mm of rain on roughly 11 days, which makes September a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 45 min on an average September day.
The nearest other city in this atlas is Bremerhaven (31 km away). In September its highs average 17.6°C, about as warm as Wilhelmshaven, with 66 mm of rain.
Among the 120 cities listed in Germany, Wilhelmshaven ranks joint 106th of 120 for the warmest September highs and joint 79th of 120 for the driest September (rainfall, lowest first). The mean September high of those 120 cities is 18.8°C; Wilhelmshaven is 0.9°C cooler than that mean.
From September to October, average highs fall by 4.6°C to 13.3°C, and monthly rainfall falls from 67 mm to 62 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
Wilhelmshaven climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.5°C0.5°C | 0.5°C | 64 | 13.4 | 8.18 h |
| February | 5.3°C0.5°C | 0.5°C | 50 | 10.0 | 9.810 h |
| March | 8.4°C2.0°C | 2.0°C | 51 | 11.2 | 11.812 h |
| April | 12.8°C4.9°C | 4.9°C | 50 | 11.0 | 14.014 h |
| May | 16.5°C8.7°C | 8.7°C | 57 | 11.5 | 15.916 h |
| June | 19.2°C11.8°C | 11.8°C | 76 | 12.6 | 16.917 h |
| July | 21.4°C14.2°C | 14.2°C | 87 | 14.4 | 16.516 h |
| August | 21.3°C14.3°C | 14.3°C | 82 | 14.2 | 14.815 h |
| September, selected | 17.9°C11.7°C | 11.7°C | 67 | 11.3 | 12.813 h |
| October | 13.3°C8.0°C | 8.0°C | 62 | 12.4 | 10.611 h |
| November | 8.3°C4.2°C | 4.2°C | 55 | 11.9 | 8.79 h |
| December | 5.2°C1.4°C | 1.4°C | 63 | 12.9 | 7.68 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
- Bremerhaven in SeptemberGermany · 31 kmHigh 17.6°C · Low 12.4°C · 66 mm rain
- Oldenburg in SeptemberGermany · 46 kmHigh 18.2°C · Low 11.4°C · 64 mm rain
- Delmenhorst in SeptemberGermany · 65 kmHigh 18.2°C · Low 11.5°C · 58 mm rain
- Bremen in SeptemberGermany · 70 kmHigh 18.3°C · Low 11.4°C · 58 mm rain
- Groningen in SeptemberThe Netherlands · 108 kmHigh 17.8°C · Low 11.7°C · 68 mm rain
- Hamburg in SeptemberGermany · 125 kmHigh 18.3°C · Low 11.1°C · 56 mm rain
- Norderstedt in SeptemberGermany · 126 kmHigh 17.9°C · Low 11.2°C · 56 mm rain
- Neumünster in SeptemberGermany · 137 kmHigh 17.7°C · Low 11.2°C · 56 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 Wilhelmshaven) is explained once on the Wilhelmshaven year overview and on the Sources, method and limits page.