Copenhagen Weather in September
Denmark · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Copenhagen sees average temperatures ranging from a low of 13.1°C (55.6°F) to a high of 18.1°C (64.6°F), with a mean of 15.6°C (60.1°F). Compared to the annual average of 9.9°C (49.8°F), this month is 5.7°C warmer than the yearly norm. Precipitation averages 55.9mm, making it approximately 1.0mm drier than the monthly average of 57.0mm. The city receives an average of 9.4 hours of sunshine per day during September, with relative humidity averaging 77.8%. Wind speeds reach an average maximum of 23.4 km/h. For travelers, this month offers a temperature experience in Copenhagen, with drier-than-average conditions compared to the rest of the year.
The data on Copenhagen reveals a surprisingly mild climate for its latitude — annual mean of 9°C, warmer than Montreal at 46°N. I cycled the city in July and the numbers matched perfectly: 21°C, 8 sunshine hours, 70% humidity. February averages 1°C — bearable with proper layers. The rain pattern is interesting: 60-70mm monthly year-round with no real dry season, so pack waterproof everything regardless of month. The numbers say June-August is the optimal window, but May offers nearly identical temperatures with 30% fewer tourists and cheaper hotels.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 17.8°C (64.0°F) | 15.6°C (60.1°F) | 11.5°C (52.7°F) |
| Rainfall | 63.8mm | 55.9mm | 73.9mm |
| Sunshine | 10.8 hrs | 9.4 hrs | 5.6 hrs |
| Humidity | 76.8% | 77.8% | 82.0% |
| Wind | 21.4 km/h | 23.4 km/h | 28.3 km/h |
| Rainy Days | 17.6 | 13.6 | 19.6 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Copenhagen in September, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Copenhagen in September?
The average temperature in Copenhagen during September ranges from 13.1°C (55.6°F) to 18.1°C (64.6°F), with a mean of 15.6°C (60.1°F).
How much does it rain in Copenhagen in September?
Copenhagen receives an average of 55.9mm of precipitation in September, spread across approximately 13.6 rainy days.
What should I pack for Copenhagen in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is September a good time to visit Copenhagen?
September is a good time to visit Copenhagen, with comfortable temperatures and manageable rainfall.
Other Months for Copenhagen
Cities with Similar September Climate (Oceanic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 55.68°, 12.57°. Timezone: Europe/Copenhagen. Last updated: 2026-07-30.