Frankfurt weather in September
September in Frankfurt: nice, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Frankfurt · #91 of 604 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Frankfurt climate normals — September
| Daytime high | 22°C / 71°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 20°C / 68°F | |
| Rainfall | 52 mm / 2.1 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12.6 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 47 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Frankfurt in September — FAQ
- Is September a good time to visit Frankfurt?
- September in Frankfurt: nice, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Frankfurt on SeasonMap's comfort score (89/100).
- What is the weather like in Frankfurt in September?
- In September, Frankfurt averages a daily high of 21.6°C and a low of 12.2°C, with about 52.1 mm of rain over roughly 7.4 rainy days.
- What is the air quality in Frankfurt in September?
- Frankfurt has a mean US Air Quality Index of about 47 in September.