Copenhagen Weather in September
September in Copenhagen sees daytime temperatures around 18°C (64°F) and lows of 11°C (52°F) at night. With around 68 mm (2.7 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Copenhagen in September
You can typically expect 14 days of rain this month, averaging around 68 mm (2.7 in). Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Copenhagen in September
Daytime highs in Copenhagen in September reach 18°C (64°F), with nights around 11°C (52°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Copenhagen in September
The city usually sees around 142 hours of sunlight, indicating a moderately sunny period.
Wind Speed in Copenhagen in September
Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.
Average water temperature in September
At 14°C (57°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Denmark, check out our Copenhagen's climate page.
Copenhagen Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
18°C (64°F)
Water Temperature
14°C (57°F)
Chance of Rain
46%
Precipitation
68 mm (2.7 in)
Rainy days
14 days
Humidity
79%
Windspeed
5 m/s (10 knots)
Sunshine
142 hours
Percentage Sunshine
41%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Copenhagen typically drop from around 19°C (66°F) at the start of September to approximately 15°C (59°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Copenhagen in September
Browse day-by-day weather records for Copenhagen spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Copenhagen historical weather extremes in September
Based on 49 years of weather observations in Copenhagen between 1976 and 2025, these are the recorded extremes.
- On September 4, 2024, temperatures climbed to 27°C (81°F), marking the warmest September day on record.
- The coldest September day was on September 30, 1995, with a maximum of 10°C (50°F).
- Nighttime temperatures dropped to 2°C (36°F) on September 11, 1996, marking the coldest September night on record.
- The wettest September day on record brought 40 mm (1.6 in) of precipitation to Copenhagen (September 15, 1994).
Best Places in Denmark in September
Find out more about the weather in Denmark and which places have the best travel conditions in this month. See all of Denmark in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Copenhagen in September
For Copenhagen in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. With water temperatures around 14°C (57°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Copenhagen in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Denmark, check out our Copenhagen's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Copenhagen climate overview or explore weather in Denmark.
