The best months to visit Annecy are June, July, August and September, when average highs sit in the comfortable 20s and the skies turn their sunniest. June reaches 24.1 °C with 13 rain days, while August climbs to 26.5 °C with just 9 rain days — the driest month of the warm season. July and August are peak season, crowded with summer-holiday visitors drawn to Lake Annecy. The quiet, cold months of November through February are the least sunny and least busy, though far chillier.
Best months JuneJulyAugustSeptember
Annecy month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sunshine | Days ≥30 °C | Crowds |
|---|---|---|---|---|---|---|
| January | 6.3 °C | 0.1 °C | 14 | ●●●●● | – | ●●●●● |
| February | 9.2 °C | 1.4 °C | 11 | ●●●●● | – | ●●●●● |
| March | 11.9 °C | 2.9 °C | 13 | ●●●●● | – | ●●●●● |
| April | 15.4 °C | 5.6 °C | 11 | ●●●●● | – | ●●●●● |
| May | 18.5 °C | 9.5 °C | 15 | ●●●●● | – | ●●●●● |
| June | 24.1 °C | 14.6 °C | 13 | ●●●●● | 3 | ●●●●● |
| July | 26.3 °C | 16.5 °C | 11 | ●●●●● | 5 | ●●●●● |
| August | 26.5 °C | 16.5 °C | 9 | ●●●●● | 8 | ●●●●● |
| September | 21.3 °C | 12.8 °C | 11 | ●●●●● | – | ●●●●● |
| October | 16.9 °C | 8.8 °C | 11 | ●●●●● | – | ●●●●● |
| November | 10.2 °C | 3.7 °C | 14 | ●●●●● | – | ●●●●● |
| December | 7.5 °C | 1.4 °C | 13 | ●●●●● | – | ●●●●● |
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. Sunshine is shown relative to the city's own year (modelled data overstates absolute hours).Heat and sea: days with a high of 30 °C or more are averaged over 2016–2025 (ERA5).Crowds:Relative to an average month in the same region (Eurostat nights spent at tourist accommodation, by NUTS 2 region and month) — a measure of season, not of how crowded one city is compared with another. Busiest month August, quietest November; NUTS 2 region FRK2, 2022–2025, Eurostat.
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When to go, and what to expect
Spring (Mar–May)
Good for walkers who don't mind showers; not yet swimming weather.
Summer (Jun–Aug)
The prime window for the lake and the sunniest skies — go early or late if you dislike crowds.
Autumn (Sep–Nov)
September is a sweet spot — warm, calmer, still inviting.
Winter (Dec–Feb)
For festive strolls and nearby ski trips, not lake days.
Notable events
- August
- Fête du Lac (lakeside fireworks spectacular)
- June
- Annecy International Animation Film Festival
- December
- Noël à Annecy Christmas markets
- Late winter (February–March)
- Venetian Carnival of Annecy
Frequently asked
Is Annecy too hot in August?
No. August averages a high of 26.5 °C, comfortably warm rather than scorching, and it's the driest month with only 9 rain days — ideal for the lake.
What is the rainiest month in Annecy?
May sees the most rain days at 15, with January and November close behind at 14. The warm months are drier, August lowest at 9 rain days.
Is winter worth visiting Annecy?
It's quiet and cold, with highs around 6.3 °C in January and December the least sunny month. Worth it for Christmas markets and ski access, but not for lakeside time.
Know when to go? Now decide where to stay — our Annecy area guide →
Areas of Annecy
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 Annecy — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.