Lake Thun
Lake Thun is a Swiss lake (Bern) at 558 m, covering 48 km² with a maximum depth of 217 m. Typical winds: Föhn (SE), Westwind, Bise. Main shores and access points: Thun, Spiez, Oberhofen, Hilterfingen, Faulensee, Merligen, Interlaken. 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 Thun: 1991–2020 normals
In Lake Thun (558 m), the mean annual temperature is 9.7 °C. The warmest month is July (18.5 °C on average) and the coldest January (1.2 °C). About 1150 mm of precipitation falls per year, peaking in July (143 mm) with a minimum in February (65 mm). The sun shines for about 1626 hours a year, mostly in July (223 h). On average there are 92 frost days and 8 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 30.5 °C and the absolute minimum −8.9 °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 | 1.2 °C | 12.5 °C | −8.9 °C | 71 | 67 | 24 | 0 |
| Feb | 1.8 °C | 14.0 °C | −8.7 °C | 65 | 82 | 21 | 0 |
| Mar | 5.5 °C | 18.4 °C | −5.4 °C | 71 | 129 | 12 | 0 |
| Apr | 9.1 °C | 22.0 °C | −1.6 °C | 80 | 164 | 3 | 0 |
| May | 13.2 °C | 26.2 °C | 2.8 °C | 119 | 183 | 0 | 3 |
| Jun | 16.8 °C | 29.7 °C | 6.8 °C | 124 | 200 | 0 | 11 |
| Jul | 18.5 °C | 30.5 °C | 9.3 °C | 143 | 223 | 0 | 15 |
| Aug | 18.1 °C | 30.0 °C | 8.5 °C | 141 | 199 | 0 | 14 |
| Sep | 14.4 °C | 25.4 °C | 5.1 °C | 91 | 152 | 0 | 3 |
| Oct | 10.3 °C | 21.4 °C | 0.5 °C | 78 | 103 | 1 | 0 |
| Nov | 5.2 °C | 16.8 °C | −4.6 °C | 78 | 68 | 10 | 0 |
| Dec | 2.1 °C | 12.6 °C | −8.2 °C | 89 | 56 | 22 | 0 |
| Year | 9.7 °C | 30.5 °C | −8.9 °C | 1150 | 1626 | 92 | 46 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Interlaken (12 km, 578 m), Adelboden (24 km, 1321 m), Jungfraujoch (25 km, 3571 m), adjusted to the elevation of Lake Thun (558 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Swiss lakes
- Weather Blausee (17 km · 887 m)
- Weather Lake Brienz (20 km · 564 m)
- Weather Lake Oeschinen (20 km · 1578 m)
- Weather Schwarzsee (Lac Noir) (34 km · 1046 m)
- Weather Lake Lungern (36 km · 689 m)
- Weather Lake Sarnen (44 km · 469 m)
Nearby municipalities
- Weather Krattigen (3 km)
- Weather Aeschi bei Spiez (4 km)
- Weather Wimmis (4 km)
- Weather Reichenbach im Kandertal (6 km)
- Weather Beatenberg (6 km)
- Weather Därligen (6 km)
- Weather Leissigen (6 km)
- Weather Oberhofen am Thunersee (7 km)
Frequently asked questions about the weather: Lake Thun
What is the wind like on Lake Thun today?
The “Wind on the lake” section shows hourly average wind speed, gusts and direction for the next 24 hours, computed over the lake (558 m).
Can you swim in Lake Thun?
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 Thun?
Characteristic winds: Föhn (SE), Westwind, Bise. Storm warnings on Swiss lakes are signalled by flashing lights (40 flashes/min = caution, 90 = storm).
What is the warmest month in Lake Thun?
The warmest month in Lake Thun is July, averaging 18.5 °C (1991–2020 normal). The coldest is January at 1.2 °C.
How much does it rain in Lake Thun per year?
Lake Thun receives about 1150 mm of precipitation a year. The wettest month is July (143 mm), the driest February (65 mm).
When is the best time to visit Lake Thun?
For warmth and sunshine: July (18.5 °C on average, 223 h of sun). The coldest month is January (1.2 °C). Check the 15-day forecast above for your dates.