Annecy weather by month
Month by month, honestly
| Period | What it is like | Worth coming? |
|---|---|---|
| December–February | Cold and short-dayed — January highs around 5 °C. The Old Town is at its quietest and the mountains are in season. | Yes, for the town and the ski access — not for the lake |
| March–April | Warming unevenly. Bright days and cold ones in the same week. The lake is far too cold to swim. | Good value, low crowds, plan for weather |
| May | Warm and green — and the wettest month of the year, about 164 mm over around sixteen days. | Yes from mid-month, with a rain plan |
| June | The best month here. Warm, long days, the lake swimmable from late June, and the festival mid-month. | Yes — book early, especially festival week |
| July–August | July highs around 25 °C, water around 22 °C, and still about 145 mm of rain in July. Busiest in August. | Yes if you want to swim and accept the crowds |
| September | The other right answer. Warm, the lake still holds its heat, and the August prices and queues are gone. | Yes — the quiet best of the year |
| October–November | Cooling and often grey, with the autumn colour on the slopes above the lake. | For walking and the town, not the water |
The rain nobody warns you about
Annecy gets around 1,600 mm of precipitation a year. That is high for France, and it is a direct consequence of sitting where the pre-Alps meet the lake. May is the wettest month at roughly 164 mm spread over about sixteen days; July, in the middle of what everyone considers the season, still gets about 145 mm.
What that looks like in practice is not week-long drizzle. It is warm, bright mornings and thunderstorms that build over the mountains and arrive in the afternoon, hard and briefly. That is normal summer weather here rather than a bad week, and the guides that print a sunny average and stop are the ones that leave people surprised.
The practical answer to an Annecy thunderstorm is a plan rather than an umbrella. The château and the Palais de l’Île are both indoors and both about an hour. The two-day itinerary is built with that swap already in it.
The water, which lags the air
The lake does not follow the air temperature. It is 82 m deep and warms slowly, so the surface reaches its useful temperature — around 22 °C — only in July and August, and holds it into early September after the air has started to cool. That lag is the real argument for September over May: the same air temperature, much better water. The lake numbers are here.
What the weather does to the rest of the trip
Paragliding is the activity most exposed to it. Flights are cancelled for wind and storms, not for cloud, and the standard advice is to book it for your first available day rather than your last so there is room to rebook. Canyoning is similarly weather-dependent, for the obvious reason.
Boats run in most conditions. A cruise is one of the few things here that a grey afternoon does not really spoil, and it is the standard fallback when the flying is off.
For the full argument about which month to choose rather than what each one is like, the best-time page makes the case properly. Winter gets its own page because it is a genuinely different trip.
Walk and boatAnnecy: Old Town Guided Walking Tour & Scenic Lake Cruise
Lake launchAnnecy: Introductory Paragliding Flight over the Lake
SunsetFrom Annecy: Semnoz Sunset Evening with an Aperitif
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Frequently asked questions
What is the weather like in Annecy?
Warm summers and cold winters — July highs around 25 °C, January highs around 5 °C — with high precipitation for France at roughly 1,600 mm a year and regular summer thunderstorms.
What is the wettest month in Annecy?
May, at around 164 mm over roughly sixteen days. July still gets about 145 mm, mostly as afternoon thunderstorms rather than steady rain.
When is the best weather in Annecy?
Mid-May to late June and September give the best balance of warmth and crowds. July and August are hotter and the lake is warmest, but August is the busiest and most expensive month of the year.
How warm is Annecy in summer?
July highs sit around 25 °C, with the lake surface around 22 °C in July and August. Afternoon thunderstorms are a normal part of summer here.
Does it rain a lot in Annecy?
More than most of France — about 1,600 mm a year. It falls in bursts rather than continuously, with mountain thunderstorms building in the afternoon and clearing again.
Is Annecy cold in winter?
January highs are around 5 °C, so cold but not extreme. The town is at its quietest and the ski areas above the lake are in season.