Climate averages 1991–2020
Groningen 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 Groningen: daytime highs average 17.8°C and nights cool to about 11.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 68 mm of rain on roughly 12 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 Leeuwarden (50 km away). In September its highs average 17.5°C, about as warm as Groningen, with 75 mm of rain.
Among the 44 cities listed in the Netherlands, Groningen ranks 40th of 44 for the warmest September highs and 26th of 44 for the driest September (rainfall, lowest first). The mean September high of those 44 cities is 18.4°C; Groningen is 0.6°C cooler than that mean.
From September to October, average highs fall by 4.3°C to 13.4°C, and monthly rainfall falls from 68 mm to 63 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
Groningen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.9°C0.8°C | 0.8°C | 63 | 12.6 | 8.18 h |
| February | 5.7°C0.7°C | 0.7°C | 49 | 10.5 | 9.810 h |
| March | 8.7°C2.3°C | 2.3°C | 49 | 10.9 | 11.812 h |
| April | 12.7°C5.0°C | 5.0°C | 48 | 10.7 | 13.914 h |
| May | 16.2°C8.7°C | 8.7°C | 60 | 11.8 | 15.816 h |
| June | 18.8°C11.6°C | 11.6°C | 74 | 12.2 | 16.917 h |
| July | 20.9°C14.0°C | 14.0°C | 87 | 14.3 | 16.416 h |
| August | 20.9°C14.1°C | 14.1°C | 83 | 14.0 | 14.815 h |
| September, selected | 17.8°C11.7°C | 11.7°C | 68 | 12.1 | 12.713 h |
| October | 13.4°C8.1°C | 8.1°C | 63 | 12.5 | 10.611 h |
| November | 8.7°C4.5°C | 4.5°C | 57 | 12.2 | 8.79 h |
| December | 5.6°C1.7°C | 1.7°C | 63 | 12.4 | 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
- Leeuwarden in SeptemberThe Netherlands · 50 kmHigh 17.5°C · Low 12.5°C · 75 mm rain
- Zwolle in SeptemberThe Netherlands · 85 kmHigh 18.3°C · Low 11.4°C · 66 mm rain
- Almelo in SeptemberThe Netherlands · 96 kmHigh 18.6°C · Low 11.1°C · 65 mm rain
- Hengelo in SeptemberThe Netherlands · 107 kmHigh 18.7°C · Low 11.3°C · 65 mm rain
- Lelystad in SeptemberThe Netherlands · 108 kmHigh 18.1°C · Low 12.3°C · 76 mm rain
- Wilhelmshaven in SeptemberGermany · 108 kmHigh 17.9°C · Low 11.7°C · 67 mm rain
- Oldenburg in SeptemberGermany · 110 kmHigh 18.2°C · Low 11.4°C · 64 mm rain
- Deventer in SeptemberThe Netherlands · 111 kmHigh 18.5°C · Low 11.4°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 Groningen) is explained once on the Groningen year overview and on the Sources, method and limits page.