Cologne weather in September
September in Cologne: nice, a little rain, with clean air — an excellent time to visit.
#5 of 12 months in Cologne · #260 of 604 destinations to visit in September · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Cologne climate normals — September
| Daytime high | 21°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 20°C / 68°F | |
| Rainfall | 69 mm / 2.7 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 12°C / 54°F | |
| Sunshine | 8.7 h/day | |
| Daylight | 12.6 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Cologne?
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Cologne in September — FAQ
- Is September a good time to visit Cologne?
- September in Cologne: nice, a little rain, with clean air — an excellent time to visit. It ranks #5 of 12 months for Cologne on SeasonMap's comfort score (82/100).
- What is the weather like in Cologne in September?
- In September, Cologne averages a daily high of 20.7°C and a low of 12.4°C, with about 69.4 mm of rain over roughly 10 rainy days.
- What is the air quality in Cologne in September?
- Cologne has a mean US Air Quality Index of about 48 in September.