New €155m Les Grands Montets Lift Begins Opening This Winter
Closed since the devastating 2018 fire, the first part of the flagship new Grands Montets lift above Argentière in the Chamonix Valley is set to open this December.
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Osa at 865 m altitude
Issued by Snow-Forecast.com at: 2 pm (local time) / 19 Sep 2026
Next 3 days weather summary:Moderate rain (total 11.0mm), heaviest on Sat afternoon. Warm (max 21°C on Sat afternoon, min 15°C on Sun night). Winds increasing (light winds from the NE on Sat afternoon, fresh winds from the NNE by Mon afternoon). | Days 4-6 weather summary:Light rain (total 2.0mm), mostly falling on Fri morning. Warm (max 22°C on Thu afternoon, min 16°C on Tue night). Wind will be generally light. | ||||||||||||||||
Sat 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  |  | |  |  | |  |  | | | |  | | | |
t-storm risk | rain shwrs | rain shwrs | light rain | some clouds | light rain | cloudy | light rain | rain shwrs | clear | clear | clear | clear | clear | some clouds | some clouds | some clouds | |
km/h | |||||||||||||||||
Snow map |  |  |  |  |  |  | |||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
mm | 3 | 2 | 1 | 1 | — | 1 | — | 1 | 2 | — | — | — | — | — | — | — | — |
max °C | 21 | 19 | 19 | 19 | 17 | 17 | 16 | 15 | 17 | 18 | 16 | 20 | 20 | 17 | 21 | 22 | 18 |
min °C | 20 | 18 | 19 | 18 | 15 | 16 | 15 | 15 | 16 | 17 | 16 | 18 | 18 | 17 | 19 | 19 | 18 |
chill °C | 20 | 18 | 19 | 17 | 13 | 14 | 13 | 13 | 15 | 16 | 15 | 18 | 18 | 17 | 19 | 19 | 18 |
Humid % | 90 | 93 | 94 | 93 | 93 | 95 | 91 | 81 | 92 | 77 | 52 | 37 | 48 | 52 | 62 | 62 | 85 |
Freeze m | 4700 | 4650 | 4750 | 5050 | 5200 | 5200 | 5250 | 5300 | 5050 | 4900 | 4800 | 4750 | 4700 | 4700 | 4650 | 4650 | 4600 |
 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — |
 | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — |
Days 7-16 weather summary:
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Avalanche information: Japan Avalanche Network
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Latest snow reports near Osa:
Osa Snow Conditions
| Top snow depth: | — |
|---|---|
| Bottom snow depth: | — |
| Fresh snowfall depth: | — |
| Last snowfall: | 13 Mar 2026 |
| Snow Alerts | Create Alert |
Other resorts in Japan - Hiroshima are reporting: powder (0) / good piste (0)
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Snow History
Week 3 of September has on average:
0.0 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
0.0 | Powder days Fresh snow, limited sun, any wind. |
0.0 | Bluebird days Average snow, mostly sunny, light wind. |
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Other resorts in Japan - Hiroshima are reporting: powder (0) / good piste (0)
The above table gives the weather forecast for Osa at the specific elevation of 865 m. Our sophisticated weather models allow us to provide snow forecasts for the top, middle and bottom ski stations of Osa. To access the weather forecasts for the other elevations, use the tab navigation above the table. For a wider view of the weather, check out the Weather Map of Japan.
Click here to read further information on freezing levels and how we forecast our temperatures.
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