St-Léonard underground lake
St-Léonard underground lake (cave) sits at 500 m (Valais), near Saint-Léonard, Sion, Sierre. The weather above is computed for the site itself: hourly forecast to pick the best visiting slot (rain, sun, UV), golden hours for photography, 15-day forecast for planning and the 1991–2020 climate for the best season.
Climate of St-Léonard underground lake: 1991–2020 normals
In St-Léonard underground lake (500 m), the mean annual temperature is 11.2 °C. The warmest month is July (20.3 °C on average) and the coldest January (2.4 °C). About 636 mm of precipitation falls per year, peaking in December (73 mm) with a minimum in April (39 mm). The sun shines for about 2137 hours a year, mostly in July (269 h). On average there are 90 frost days and 21 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 32.7 °C and the absolute minimum −7.8 °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 | 2.4 °C | 12.9 °C | −7.8 °C | 61 | 90 | 24 | 0 |
| Feb | 3.2 °C | 15.0 °C | −7.4 °C | 50 | 130 | 20 | 0 |
| Mar | 7.0 °C | 19.5 °C | −4.0 °C | 43 | 188 | 9 | 0 |
| Apr | 10.7 °C | 23.3 °C | −0.5 °C | 39 | 209 | 1 | 2 |
| May | 14.7 °C | 27.8 °C | 4.0 °C | 58 | 225 | 0 | 8 |
| Jun | 18.4 °C | 31.5 °C | 7.5 °C | 53 | 251 | 0 | 17 |
| Jul | 20.3 °C | 32.7 °C | 10.0 °C | 60 | 269 | 0 | 22 |
| Aug | 19.9 °C | 32.2 °C | 9.2 °C | 63 | 248 | 0 | 20 |
| Sep | 15.9 °C | 27.4 °C | 5.9 °C | 39 | 208 | 0 | 7 |
| Oct | 11.8 °C | 23.5 °C | 1.6 °C | 45 | 159 | 2 | 0 |
| Nov | 6.5 °C | 18.5 °C | −3.6 °C | 53 | 94 | 11 | 0 |
| Dec | 3.2 °C | 13.7 °C | −6.9 °C | 73 | 66 | 23 | 0 |
| Year | 11.2 °C | 32.7 °C | −7.8 °C | 636 | 2137 | 90 | 77 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Montana (6 km, 1423 m), Sion (8 km, 482 m), Evolène / Villa (17 km, 1825 m), adjusted to the elevation of St-Léonard underground lake (500 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Sights & landmarks
- Weather Saillon thermal baths (20 km · 480 m)
- Weather Dar Waterfall (21 km · 1450 m)
- Weather Leukerbad thermal baths (21 km · 1411 m)
- Weather Lac Bleu (Arolla) (23 km · 2090 m)
- Weather Engstligen Falls (26 km · 1400 m)
- Weather Lavey thermal baths (30 km · 420 m)
Nearby municipalities
- Weather Saint-Léonard (1 km)
- Weather Ayent (1 km)
- Weather Vex (3 km)
- Weather Grimisuat (4 km)
- Weather Lens (4 km)
- Weather Savièse (4 km)
- Weather Mont-Noble (5 km)
- Weather Sion (5 km)
Sights & landmarks Weather Saint-Léonard
Frequently asked questions about the weather: St-Léonard underground lake
When is the best time to visit St-Léonard underground lake?
Pick a rain-free slot in the hourly forecast; for photos, aim for the golden hours (sunrise/sunset) shown above. The sunniest month is July and the warmest July (20.3 °C).
What will the weather be like at St-Léonard underground lake tomorrow?
The “15-Day Forecast” section and the “7-day forecast” block give tomorrow's weather at St-Léonard underground lake: min/max temperature, precipitation, wind. Updated hourly.
Where is St-Léonard underground lake?
St-Léonard underground lake is at 500 m, Valais, near Saint-Léonard, Sion, Sierre. See the nearby municipalities below for the weather around it.
What is the warmest month in St-Léonard underground lake?
The warmest month in St-Léonard underground lake is July, averaging 20.3 °C (1991–2020 normal). The coldest is January at 2.4 °C.
How much does it rain in St-Léonard underground lake per year?
St-Léonard underground lake receives about 636 mm of precipitation a year. The wettest month is December (73 mm), the driest April (39 mm).
When is the best time to visit St-Léonard underground lake?
For warmth and sunshine: July (20.3 °C on average, 269 h of sun). The coldest month is January (2.4 °C). Check the 15-day forecast above for your dates.