Flensburg Weather in September
Flensburg in September averages 19°C (66°F) during the day and 11°C (52°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Flensburg in September
Past climate data indicates that roughly 16 days will see rain, totalling around 73 mm (2.9 in) for the month. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Flensburg in September
If you're visiting Flensburg in September, expect highs of 19°C (66°F) and overnight lows around 11°C (52°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights drop to around 11°C (52°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Flensburg in September
With about 174 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.Should you favor a climate that's both dry and comfortably warm, June, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Germany, check out our Flensburg's climate page.
Flensburg Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
19°C (66°F)
Chance of Rain
55%
Precipitation
73 mm (2.9 in)
Rainy days
16 days
Humidity
80% *
Sunshine
174 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Flensburg typically drop from around 19°C (66°F) at the start of September to approximately 16°C (61°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Flensburg in September
Browse day-by-day weather records for Flensburg spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Flensburg historical weather extremes in September
Based on 49 years of weather observations in Flensburg between 1976 and 2025, these are the recorded extremes.
- The warmest day in September was on September 13, 2016, with a maximum of 28°C (82°F).
- The coldest September day was on September 29, 1978, with a maximum of 9°C (48°F).
- Nighttime temperatures dropped to -1°C (30°F) on September 18, 1977, marking the coldest September night on record.
Best Places in Germany in September
Find out more about the weather in Germany and which places have the best travel conditions in this month. See all of Germany in September →
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What to Wear in Flensburg in September
For Flensburg in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Flensburg in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Germany, check out our Flensburg's climate page.
Temperature Rainfall Sunshine Humidity
See the full Flensburg climate overview or explore weather in Germany.
