Climate averages 1991–2020
Flensburg weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Flensburg: daytime highs average 17.0°C and nights cool to about 11.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 63 mm of rain on roughly 11 days, which makes September a moderately wet month (the joint 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 47 min on an average September day.
The nearest other city in this atlas is Kiel (69 km away). In September its highs average 17.6°C, 0.6°C warmer than Flensburg, with 54 mm of rain.
Among the 120 cities listed in Germany, Flensburg ranks 118th of 120 for the warmest September highs and joint 53rd of 120 for the driest September (rainfall, lowest first). The mean September high of those 120 cities is 18.8°C; Flensburg is 1.7°C cooler than that mean.
From September to October, average highs fall by 4.7°C to 12.4°C, and monthly rainfall rises from 63 mm to 65 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
Flensburg climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.7°C-0.2°C | -0.2°C | 64 | 12.7 | 7.98 h |
| February | 4.2°C-0.3°C | -0.3°C | 50 | 10.5 | 9.610 h |
| March | 7.0°C0.9°C | 0.9°C | 50 | 10.7 | 11.812 h |
| April | 11.7°C3.9°C | 3.9°C | 43 | 9.6 | 14.114 h |
| May | 15.7°C7.9°C | 7.9°C | 55 | 10.6 | 16.116 h |
| June | 18.6°C11.2°C | 11.2°C | 68 | 11.5 | 17.217 h |
| July | 20.8°C13.6°C | 13.6°C | 74 | 12.3 | 16.717 h |
| August | 20.6°C13.8°C | 13.8°C | 76 | 12.8 | 15.015 h |
| September, selected | 17.0°C11.3°C | 11.3°C | 63 | 11.0 | 12.813 h |
| October | 12.4°C7.5°C | 7.5°C | 65 | 12.6 | 10.611 h |
| November | 7.6°C3.7°C | 3.7°C | 57 | 11.8 | 8.59 h |
| December | 4.6°C1.0°C | 1.0°C | 63 | 12.6 | 7.37 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
- Kiel in SeptemberGermany · 69 kmHigh 17.6°C · Low 11.6°C · 54 mm rain
- Neumünster in SeptemberGermany · 87 kmHigh 17.7°C · Low 11.2°C · 56 mm rain
- Odense in SeptemberDenmark · 91 kmHigh 17.2°C · Low 11.4°C · 51 mm rain
- Esbjerg in SeptemberDenmark · 98 kmHigh 16.3°C · Low 12.3°C · 85 mm rain
- Norderstedt in SeptemberGermany · 126 kmHigh 17.9°C · Low 11.2°C · 56 mm rain
- Lübeck in SeptemberGermany · 130 kmHigh 18.0°C · Low 11.4°C · 51 mm rain
- Hamburg in SeptemberGermany · 142 kmHigh 18.3°C · Low 11.1°C · 56 mm rain
- Bremerhaven in SeptemberGermany · 148 kmHigh 17.6°C · Low 12.4°C · 66 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 Flensburg) is explained once on the Flensburg year overview and on the Sources, method and limits page.