Monthly climate guide
Cologne weather in September
Expect warm weather in Cologne in September: afternoons reach about 21°C (70°F), while nights drop to around 10°C (51°F). Around 54 mm of rain falls over the month (some rain), and skies are often cloudy. Daytime highs are 4°C cooler than August and 6°C warmer than October.
What stands out in September
- Comfortable temperatures make it easy to walk between Cologne Cathedral and Altstadt.
- It cools down fast from here: October is about 5°C cooler.
- In Cologne, September is early autumn.
- Skies are at their clearest this time of year.
Avg high
21°C
70°F
Avg low
10°C
51°F
Rainfall
54 mm
some rain
Humidity
72%
relative
Sky
64%
cloud · often cloudy
Cologne weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 5°C / 41°F | 0°C / 31°F | 76 mm | 92% | 83% |
| February | 6°C / 43°F | -1°C / 30°F | 55 mm | 88% | 75% |
| March | 11°C / 51°F | 1°C / 34°F | 49 mm | 83% | 68% |
| April | 15°C / 59°F | 4°C / 40°F | 38 mm | 77% | 65% |
| May | 19°C / 65°F | 8°C / 46°F | 58 mm | 75% | 69% |
| June | 22°C / 72°F | 12°C / 53°F | 76 mm | 72% | 71% |
| July | 25°C / 76°F | 14°C / 57°F | 70 mm | 68% | 68% |
| August | 25°C / 77°F | 14°C / 57°F | 71 mm | 68% | 66% |
| September | 21°C / 70°F | 10°C / 51°F | 54 mm | 72% | 64% |
| October | 16°C / 60°F | 7°C / 45°F | 62 mm | 83% | 72% |
| November | 10°C / 49°F | 3°C / 38°F | 57 mm | 90% | 77% |
| December | 6°C / 44°F | 1°C / 35°F | 83 mm | 93% | 83% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A small travel umbrella, just in case
Is September a good time to visit Cologne?
Our Cologne guide recommends: April to October for mild weather and long daylight hours.
Kölsch beer is traditionally served in small 0.2-litre glasses — expect your waiter to keep bringing fresh ones until you say stop.
Best time to visit Cologne →Other Germany cities in September
Cite or embed this data
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Cologne weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/germany/cologne/september
<a href="https://weathercompare.eu/weather/germany/cologne/september">Cologne weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/germany/cologne" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Cologne weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/germany/cologne/september">Cologne weather in September</a> – WeatherCompare</p>
Cologne in September: quick answers
Is September a good time to visit Cologne?
Yes. September is one of the best months for Cologne, with highs around 21°C and about 54 mm of rain.
How warm is Cologne in September?
Average highs are about 21°C (70°F) and average lows about 10°C (51°F), based on 10 years of daily data.
Does it rain a lot in Cologne in September?
Cologne typically gets around 54 mm of rain in September — some rain.
When is the best time to visit Cologne?
April to October for mild weather and long daylight hours.
Figures are long-term averages for the area around Cologne (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.