Köln is warmest in August, averaging 25° by day and 14° at night. The wettest month is February with 84 mm, and the year brings about 897 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 5° | -0° | 78 mm | 8.2 h | Cool |
| February | 9° | -1° | 84 mm | 9.7 h | Cool |
| March | 11° | 1° | 65 mm | 11.5 h | Cool |
| April | 14° | 4° | 57 mm | 13.6 h | Mild |
| May | 19° | 8° | 68 mm | 15.3 h | Sightseeing |
| June | 23° | 12° | 84 mm | 16.3 h | Sightseeing |
| July | 24° | 14° | 93 mm | 15.9 h | Sightseeing |
| August | 25° | 14° | 68 mm | 14.3 h | Beach weather |
| September | 22° | 10° | 66 mm | 12.4 h | Sightseeing |
| October | 16° | 7° | 78 mm | 10.4 h | Sightseeing |
| November | 10° | 3° | 72 mm | 8.6 h | Cool |
| December | 6° | 1° | 84 mm | 7.7 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: August — highs around 25°, nights no colder than 14°, and at most 68 mm of rain in a month.
Walking the city: May, June, July, September and October — highs of 16–24° and no more than 93 mm of rain a month.