What September feels like in Cologne
In Cologne, September brings early autumn. Afternoons are mild and comfortable for most people in light layers. Once the sun goes down the air changes: nights are cool. Humidity is on the high side, but mild temperatures keep it comfortable.
Rain in Cologne in September
Showers are a regular feature, arriving about one day in 3. Wet days average about 7 mm (0.3 in), enough to soak you without an umbrella. Across the year Cologne averages about 6 mm per rainy day, so September is typical.
Daylight and sunshine in September
In mid-September, sunrise is at about 7:06 am and sunset at about 7:49 pm (local time) — 12 h 44 min of daylight. Days are getting shorter: 1 h 54 min less daylight than in mid-August. The sun is out for roughly 68% of those daylight hours, so there are plenty of bright spells.
How September compares to the rest of the year
September is the 4th warmest month of the year in Cologne. Against August, the average high is 3.4°C (6.1°F) lower, with 12 mm less rain. Temperatures keep falling into October. By October, typical highs are 15.3°C (59.5°F).
Who September suits
- Sightseeing: a good fit — comfortable enough to explore on foot all day.
- Parks & outdoor: a good fit — comfortable for long walks and picnics.
Tips for visiting Cologne in September
Versatile Layers
Days are noticeably warmer than nights — layers you can add or remove.
Rain Protection
Keep a small umbrella in your bag and wear shoes that cope with puddles.
Sunglasses
Plenty of sun, so bring sunglasses and a cap.
Quick questions
How warm is Cologne in September?
Afternoons average 20°C (68°F) and nights about 11.9°C (53.4°F) — mild by most people's standards. It is the 4th warmest month of the year.
Does it rain a lot in Cologne in September?
It does: about 10 rainy days bring roughly 70 mm, so plan some indoor options.
What should I wear in Cologne in September?
The numbers point to versatile layers, rain protection and sunglasses. Bring something extra for the cooler evenings.
Is September or October better for visiting Cologne?
September scores better on our climate ranking (#1 of 12 vs #7), rated Great against Good. October is cooler and has more rainy days.