Copenhagen weather in September
September in Copenhagen: nice, a little rain, with clean air — an excellent time to visit.
#5 of 12 months in Copenhagen · #285 of 604 destinations to visit in September · comfort 81/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Copenhagen climate normals — September
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 65 mm / 2.6 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 8.1 h/day | |
| Daylight | 12.7 h | |
| Wind | 22 km/h / 14 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Copenhagen in September — FAQ
- Is September a good time to visit Copenhagen?
- September in Copenhagen: nice, a little rain, with clean air — an excellent time to visit. It ranks #5 of 12 months for Copenhagen on SeasonMap's comfort score (81/100).
- What is the weather like in Copenhagen in September?
- In September, Copenhagen averages a daily high of 17.9°C and a low of 12.2°C, with about 64.9 mm of rain over roughly 10.4 rainy days.
- What is the air quality in Copenhagen in September?
- Copenhagen has a mean US Air Quality Index of about 42 in September.