Lake Geneva
Lake Geneva is a Swiss lake (Vaud, Geneva, Valais) at 372 m, covering 580 km² with a maximum depth of 309 m. Typical winds: bise (NE), vent (SW), joran, séchard. Main shores and access points: Genève, Lausanne-Ouchy, Vevey, Montreux, Nyon, Morges, Villeneuve, Le Bouveret. The weather above is computed over the middle of the lake; the “Wind on the lake” section details hourly speed, gusts and direction — for sailing, windsurfing, paddling, fishing or swimming.
Climate of Lake Geneva: 1991–2020 normals
In Lake Geneva (372 m), the mean annual temperature is 11.6 °C. The warmest month is July (20.9 °C on average) and the coldest January (3.0 °C). About 1076 mm of precipitation falls per year, peaking in May (105 mm) with a minimum in February (62 mm). The sun shines for about 1956 hours a year, mostly in July (258 h). On average there are 43 frost days and 8 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 31.7 °C and the absolute minimum −5.1 °C.
Mean monthly precipitation (mm) — bar height relative to the wettest month.
| Month | Mean T | Abs. max | Abs. min | Precip. (mm) | Sunshine (h) | Frost days | Summer days |
|---|---|---|---|---|---|---|---|
| Jan | 3.0 °C | 11.7 °C | −5.1 °C | 74 | 78 | 13 | 0 |
| Feb | 3.7 °C | 13.2 °C | −4.5 °C | 62 | 109 | 11 | 0 |
| Mar | 7.4 °C | 18.2 °C | −1.6 °C | 68 | 169 | 4 | 0 |
| Apr | 11.0 °C | 22.7 °C | 1.2 °C | 78 | 192 | 0 | 0 |
| May | 15.1 °C | 27.1 °C | 5.7 °C | 105 | 211 | 0 | 3 |
| Jun | 18.8 °C | 30.4 °C | 9.2 °C | 100 | 238 | 0 | 11 |
| Jul | 20.9 °C | 31.7 °C | 11.9 °C | 99 | 258 | 0 | 18 |
| Aug | 20.5 °C | 31.2 °C | 11.3 °C | 104 | 240 | 0 | 16 |
| Sep | 16.4 °C | 26.1 °C | 7.8 °C | 93 | 188 | 0 | 3 |
| Oct | 12.1 °C | 21.3 °C | 3.7 °C | 104 | 133 | 0 | 0 |
| Nov | 7.0 °C | 16.5 °C | −0.5 °C | 94 | 80 | 3 | 0 |
| Dec | 3.8 °C | 12.3 °C | −3.9 °C | 94 | 60 | 10 | 0 |
| Year | 11.6 °C | 31.7 °C | −5.1 °C | 1076 | 1956 | 43 | 51 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Pully (11 km, 456 m), Nyon / Changins (25 km, 458 m), Aigle (32 km, 381 m), adjusted to the elevation of Lake Geneva (372 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Swiss lakes
- Weather Lake Tanay (25 km · 1408 m)
- Weather Lake Joux (29 km · 1004 m)
- Weather Lake Gruyère (50 km · 677 m)
- Weather Lake Neuchâtel (55 km · 429 m)
- Weather Schwarzsee (Lac Noir) (61 km · 1046 m)
- Weather Lake Champex (64 km · 1466 m)
Nearby municipalities
- Weather Préverenges (8 km)
- Weather Ecublens (VD) (8 km)
- Weather Denges (8 km)
- Weather Saint-Sulpice (VD) (8 km)
- Weather Tolochenaz (8 km)
- Weather Morges (8 km)
- Weather Chavannes-près-Renens (9 km)
- Weather Saint-Prex (9 km)
Swiss lakes Weather Préverenges
Frequently asked questions about the weather: Lake Geneva
What is the wind like on Lake Geneva today?
The “Wind on the lake” section shows hourly average wind speed, gusts and direction for the next 24 hours, computed over the lake (372 m).
Can you swim in Lake Geneva?
In summer (June to September) lowland lakes usually reach 18–24 °C at the surface; there are many public beaches and lidos. Check the air temperature, sunshine and UV index above to pick your slot.
What are the typical winds on Lake Geneva?
Characteristic winds: bise (NE), vent (SW), joran, séchard. Storm warnings on Swiss lakes are signalled by flashing lights (40 flashes/min = caution, 90 = storm).
What is the warmest month in Lake Geneva?
The warmest month in Lake Geneva is July, averaging 20.9 °C (1991–2020 normal). The coldest is January at 3.0 °C.
How much does it rain in Lake Geneva per year?
Lake Geneva receives about 1076 mm of precipitation a year. The wettest month is May (105 mm), the driest February (62 mm).
When is the best time to visit Lake Geneva?
For warmth and sunshine: July (20.9 °C on average, 258 h of sun). The coldest month is January (3.0 °C). Check the 15-day forecast above for your dates.