Weather in Frankfurt in September 2025
Average weather
Average temperature in Frankfurt in September
The expected average maximum temperature in September is +25°C with a maximum of +31°C and a minimum of +8°C.
The average maximum temperature goes down 4% by the end of the month, compared with the beginning of the month, from +21°C to +20°C.
Is Frankfurt warm or cold in September?
Frankfurt is typically mild in September.
Maximum temperatures go down compared to the previous month from +25°C to +21°C. The minimum temperature also goes down from +15°C to +11°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Frankfurt:
Climate in Frankfurt in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +25°C | +21°C | +15°C | ||||
| Min. temperature | ||||||
| +5°C | +2°C | -4°C | ||||
| Max. temperature | ||||||
| +39°C | +35°C | +27°C | ||||
| Rainfall | ||||||
| 61 mm | 55 mm | 58 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 67% | 74% | 82% | ||||
| Air pressure | ||||||
| 1015 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 8 | 8 | 5 | ||||
| Cloudy days | ||||||
| 6 | 8 | 11 | ||||
| Rainy days | ||||||
| 13 | 13 | 15 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +25°C in the day, the average maximum temperature lowers to +21°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 61 mm to 55 mm. Humidity rises from 67% to 74%. The average wind speed doesn’t change much during September, staying around 2 m/s. The amount of sunny days stay about the same, averaging 8 sunny days during the month.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Frankfurt is gradually decreasing during September, going from 3 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Frankfurt?
Climate Change over Years
The climate in Frankfurt in September has not changed much over the last 43 years.
The average temperature was the lowest in 1996 (+13°C) and the highest in 2022 (+18°C). The driest year was 2003 with only 429 mm of rainfall, and the wettest year was 2020 with 2306 mm.
FAQ
Is September a good time to visit Frankfurt?
Can you sunbathe in Frankfurt in September?
Is Frankfurt rainy in September?
Is it sunny in Frankfurt in September?
Other cities in Germany
Monthly weather in Frankfurt
Source of the data
For this page, we’ve looked at the typical weather in Frankfurt, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.