Lake Geneva weather and the best time to visit
The best time to visit Lake Geneva depends on what you want to do. Warm days suit boats and terraces, while the shoulder months suit the vineyards and city walks, and the winter weeks bring Christmas markets. The numbers below are climate normals, which describe a typical month and not a forecast for any particular week.
The figures come from the Geneva-Cointrin station of MeteoSwiss, for the normal period 1991 to 2020. They are not a forecast for 2026, and they say nothing about the temperature of the lake or of the mountains. Check a current forecast a few days before you travel.
Climate month by month
Climate normals 1991 to 2020 of the station Geneva-Cointrin (MeteoSwiss), 411 m. Average daily high and low, and the average monthly rainfall.
| Month | High °C | Low °C | Rain mm |
|---|---|---|---|
| January | 5.1 | −1.1 | 73 |
| February | 7.0 | −1.1 | 56 |
| March | 11.8 | 1.7 | 62 |
| April | 15.9 | 5.0 | 67 |
| May | 20.1 | 9.1 | 78 |
| June | 24.2 | 12.7 | 83 |
| July | 26.7 | 14.6 | 79 |
| August | 26.2 | 14.2 | 81 |
| September | 21.1 | 10.7 | 91 |
| October | 15.5 | 7.2 | 96 |
| November | 9.3 | 2.6 | 89 |
| December | 5.6 | −0.2 | 90 |
July and August are the warmest months on average, and February has the lowest rainfall total. That does not mean a dry week is certain in any month: every month in the table has rain. Use the numbers to decide how warm to pack, not to promise sunshine.
A solar boat cruise for your travel dates
A boat trip on the lake is one way to plan time on the water whenever you travel; check the dates offered when you book.
Hand-picked tours, booked through Viator. Prices are indicative starting prices in Swiss francs (as of October 2026). Tap a tour for live availability and the current price in your currency.
A warm evening on the water
A solar boat cruise in Geneva with a welcome drink and nibbles, with live prices and availability.
The season on the lake
Many things on Lake Geneva follow the calendar. Check the operator's page before you travel, because dates move slightly from year to year.
Historic boats
The Belle Époque ships La Suisse and Montreux usually sail from mid April to mid October. Two other historic ships and two diesel-powered Belle Époque ships sail all year. Read more on the boat tours page.
Lavaux Express
The vineyard road train runs from April to the end of October. Check the first and last days of the season on the operator's page before you plan. See Lavaux for the walks and tastings.
Montreux Jazz Festival
More on the Montreux page.
Chillon Castle
Opening hours follow the season: April to September 09:00 to 19:00, March and October 09:30 to 18:00, November to February 10:00 to 17:00. The last entry is one hour earlier. See Chillon Castle.
Lake Geneva in December
December is cold, with a daily high of 5.6 °C and a low of −0.2 °C on average, and it is among the wetter months. It is also a month with events. The Christmas market in Montreux runs from 20 November to 24 December 2026, and the Rochers-de-Naye railway has a Christmas offer in the same weeks.
Some attractions pause for maintenance around the turn of the month. The Jet d'Eau in Geneva is closed for maintenance from 2 November to 3 December 2026, and the Salève cable car is closed from 2 to 26 November 2026. Plan your first week with those dates in mind, and keep indoor options ready for rainy days, such as the museums on the museums page.
Lake Geneva weather: frequently asked questions
What is the warmest month on Lake Geneva?
July, with an average daily high of 26.7 °C at Geneva-Cointrin, followed closely by August at 26.2 °C (normals 1991 to 2020).
Which month has the least rain?
February has the lowest monthly total, 56 mm on average. That is a long-term average and not a promise of dry days.
When do the historic boats run?
La Suisse and Montreux usually sail from mid April to mid October. Other Belle Époque ships sail all year.
Is the Jet d'Eau on in winter?
It is closed for maintenance from 2 November to 3 December 2026. It can also be switched off in strong wind.