The best months to visit Geneva are June, July, August and September, when average highs sit in the comfortable low-to-mid 20s and sunshine is at its longest. June reaches an average high of 24.2 °C with 12.4 hours of sun a day, while September eases to 21.4 °C with 11 rain days, ideal for lakeside walks and mountain views. July and August are peak season, warmest of all at 26.5 °C and 26.6 °C but busiest with summer-holiday crowds. Winter is the quiet low season, with highs near 5.7 °C in January and short, grey days.
Best months JuneJulyAugustSeptember
Geneva month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sun / day |
|---|---|---|---|---|
| January | 5.7 °C | -0.1 °C | 13 | 5.5 h |
| February | 8.4 °C | 0.9 °C | 10 | 7 h |
| March | 11.4 °C | 2.8 °C | 12 | 8.6 h |
| April | 15.2 °C | 5.7 °C | 11 | 10.3 h |
| May | 18.6 °C | 9.8 °C | 14 | 10.9 h |
| June | 24.2 °C | 15 °C | 13 | 12.4 h |
| July | 26.5 °C | 16.7 °C | 10 | 13.1 h |
| August | 26.6 °C | 16.8 °C | 9 | 11.8 h |
| September | 21.4 °C | 13.2 °C | 11 | 9.9 h |
| October | 16.2 °C | 8.9 °C | 11 | 7.8 h |
| November | 9.6 °C | 3.7 °C | 14 | 6 h |
| December | 6.6 °C | 0.9 °C | 13 | 5.3 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)
Good for blossom and fewer crowds, but pack for showers.
Summer (Jun–Aug)
The prime window for lake life and the Jet d'Eau — book ahead.
Autumn (Sep–Nov)
September is a top pick; later autumn turns damp and grey.
Winter (Dec–Feb)
For festive markets and nearby Alps skiing rather than city sightseeing.
Notable events
- Summer (July–August)
- Fêtes de Genève (lakeside festival with fireworks)
- December
- L'Escalade (historic celebration marking the 1602 defence of the city)
- December
- Geneva Christmas markets and festive lights
- June
- Fête de la Musique (free citywide music festival)
Frequently asked
Is Geneva too hot in August?
No. August averages a high of 26.6 °C, comfortably warm rather than scorching, and it has the fewest rain days of the year at 9 — great for the lake, though it's peak season for crowds.
What is the rainiest month in Geneva?
May and November tie for the most rain days at 14 each. Even in summer rain is possible — June sees 13 rain days — but July and August drop to 10 and 9 respectively.
Is winter worth visiting Geneva?
Winter is quiet and cold, with January highs of 5.7 °C and just 5.3 hours of sun a day in December. It suits festive markets, L'Escalade and easy access to Alpine skiing more than lakeside sightseeing.
Know when to go? Now decide where to stay — our Geneva area guide →
Areas of Geneva
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 Geneva — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.