Verdict: Excellent month
Cologne Weather in September
September hits the sweet spot in Cologne — highs around 21°C (70°F), ideal for a full day on foot. Expect showers on roughly 11 days of the month — rarely trip-ruining, worth planning around. Overall, September is one of the best months of the year to be in Cologne.
Average high
21°C / 70°F
Average low
13°C / 55°F
Rain days
~11
Precipitation
87 mm
What to pack for Cologne in September
- Layers — t-shirts under a light jacket or sweater
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Cologne: Aug (25°C / 77°F) · Coolest: Jan (6°C / 43°F) · Wettest: Dec (~17 rain days)
6°
2°
Jan
10°
3°
Feb
12°
3°
Mar
14°
5°
Apr
19°
9°
May
23°
14°
Jun
24°
15°
Jul
25°
16°
Aug
21°
13°
Sep
17°
9°
Oct
11°
5°
Nov
7°
3°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)