The best time to visit Cologne is May, June and September, when average highs sit in the comfortable 20s and skies stay bright without the summer crush. June reaches an average high of 23.6 °C with 12 rain days, while September brings 21.1 °C highs and just 10 rain days — the driest of the shortlist. July and August are pleasant but form the peak season, with school holidays filling the city and its hotels. Winter is the quiet low season, cold and grey with as little as 3 hours of sunshine a day in December.
Best months MayJuneSeptember
Cologne month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sun / day |
|---|---|---|---|---|
| January | 6 °C | 1.2 °C | 16 | 3.7 h |
| February | 8.5 °C | 2 °C | 13 | 5.4 h |
| March | 11.4 °C | 3.2 °C | 13 | 7.3 h |
| April | 14.9 °C | 5.4 °C | 12 | 9.5 h |
| May | 19.2 °C | 9.5 °C | 12 | 11 h |
| June | 23.6 °C | 14.2 °C | 12 | 11.4 h |
| July | 24.3 °C | 15.1 °C | 13 | 11.4 h |
| August | 24.7 °C | 15.5 °C | 12 | 10.6 h |
| September | 21.1 °C | 12.4 °C | 10 | 9.2 h |
| October | 15.9 °C | 9.3 °C | 14 | 5.9 h |
| November | 10.1 °C | 4.7 °C | 15 | 4.5 h |
| December | 7.3 °C | 2.7 °C | 16 | 3 h |
How the months are picked.A month qualifies when its average high sits in the comfortable 20–28 °C band (scored down towards 9 °C and 37 °C), rain days are few and sunshine hours are high — at least 78 % of the city's best-scoring month. July and August are then set aside as peak season (school-holiday crowds and prices) whenever at least three other months qualify; where summer is the only comfortable window they stay. Figures are ten-year averages (2016-01-01 to 2025-12-31) from ERA5 reanalysis data via Open-Meteo (CC BY 4.0) for the city centre coordinates.
When to go, and what to expect
Spring (Mar–May)
May is a top pick — fresh, bright and comfortable for cathedral walks and riverside strolls.
Summer (Jun–Aug)
June is warm yet uncrowded; July and August suit those who don't mind the crowds.
Autumn (Sep–Nov)
September is the sweet spot — mild, dry and relaxed. Later autumn is for museum days.
Winter (Dec–Feb)
Worth it only for the festive markets and Carnival; otherwise the low season.
Notable events
- February (peak week before Lent)
- Cologne Carnival (Karneval)
- July
- Cologne Pride (Christopher Street Day)
- Late November to December
- Cologne Christmas Markets
- Summer
- Cologne Lights (Kölner Lichter) fireworks festival
Frequently asked
Is Cologne too hot in August?
No. August averages a high of 24.7 °C, comfortably warm rather than extreme, with 12 rain days and 10.6 hours of sunshine a day. The bigger factor is crowds — August falls in the school-holiday peak.
What is the rainiest month in Cologne?
January and December are the wettest, each with 16 rain days. Rain is fairly frequent year-round, but September is the driest of the good months with just 10 rain days.
Is winter worth visiting Cologne?
Mainly for the Christmas markets and Carnival. Expect cold, grey days — a 6 °C average high in January and only 3 hours of sunshine a day in December — so pack warm layers and plan indoor time at the cathedral and museums.
Know when to go? Now decide where to stay — our Cologne area guide →
Areas of Cologne
Best time to visit near here
Sources
- Open-Meteo historical weather API — monthly climate normals, 2016–2025 (CC BY 4.0)
- ERA5 reanalysis (ECMWF / Copernicus) — the underlying temperature, precipitation and sunshine data
- ReasonStay methodology — how the best months are computed and checked
An independent guide to Cologne — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.