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Japan Weekly Snow Roundup #293
Weekly Snow News for Japan, updated 17 December 2025: Siberian cold fuels relentless powder storms, with Hokkaido leading Japan’s mid-winter surge.
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Sun Valley at 2780 m altitude
Issued by Snow-Forecast.com at: 4 pm (local time) / 18 Dec 2025
Now
Thu 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  | | |  |  | |  | |  | | |  | | | | | |
mod. snow | mod. snow | mod. snow | mod. snow | snow shwrs | clear | clear | light snow | mod. snow | light snow | mod. snow | light snow | some clouds | mod. snow | light snow | mod. snow | mod. snow | |
km/h | |||||||||||||||||
Snow map |  |  |  |  |  |  | |||||||||||
6 | 5 | 6 | 8 | — | — | — | 1 | 5 | 2 | 8 | 1 | — | 6 | 5 | 5 | 8 | |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max °C | -4 | -2 | -4 | -3 | -7 | -9 | -8 | -5 | -4 | -4 | -4 | -5 | -5 | -4 | -2 | -2 | -2 |
min °C | -7 | -4 | -4 | -4 | -11 | -11 | -8 | -8 | -5 | -4 | -4 | -5 | -5 | -4 | -3 | -2 | -3 |
-15 | -12 | -12 | -14 | -19 | -19 | -14 | -15 | -10 | -10 | -10 | -11 | -11 | -11 | -8 | -9 | -10 | |
97 | 96 | 98 | 91 | 39 | 38 | 32 | 97 | 97 | 96 | 98 | 69 | 91 | 98 | 99 | 99 | 96 | |
1500 | 2200 | 2150 | 2250 | 0 | 1050 | 550 | 1550 | 2050 | 2000 | 1900 | 2000 | 1450 | 2100 | 2300 | 2450 | 2250 | |
 | — | — | 8:06 | — | — | 8:06 | — | — | 8:07 | — | — | 8:07 | — | — | 8:07 | — | — |
 | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — | 5:02 | — | — | 5:02 | — |
Next 0-3 days weather summary:
A heavy fall of snow, heaviest during Fri afternoon. Temperatures will be below freezing (max -2°C on Thu night, min -11°C on Fri night). Winds decreasing (near gales from the W on Fri afternoon, light winds from the W by Sat afternoon).
Next 4-6 days weather summary:
A heavy fall of snow, heaviest during Mon night. Temperatures will be below freezing (max -2°C on Tue morning, min -5°C on Mon morning). Mainly fresh winds.
Popular Sun Valley Pages
Snow Radar
Latest snow reports near Sun Valley:
Sun Valley Snow Conditions
| Top snow depth: | 94 cm |
|---|---|
| Bottom snow depth: | 91 cm |
| Fresh snowfall depth: | 5 cm |
| Last snowfall: | 17 Dec 2025 |
| Snow Alerts | Create Alert |
Other resorts in USA - Idaho are reporting: powder (0) / good piste (0)
Snow History
Week 3 of December has on average:
0.8 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
1.5 | Powder days Fresh snow, limited sun, any wind. |
2.4 | Bluebird days Average snow, mostly sunny, light wind. |
Sun Valley Forecast Snowfall
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Photos of Sun Valley
Sawtooth Range by Tom
the bowls by David Boock
Sun Valley by Tom
Upload new photo Other resorts in USA - Idaho are reporting: powder (0) / good piste (0)
The above table gives the weather forecast for Sun Valley at the specific elevation of 2780 m. Our sophisticated weather models allow us to provide snow forecasts for the top, middle and bottom ski stations of Sun Valley. 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 United States.
Click here to read further information on freezing levels and how we forecast our temperatures.
Visitor Reviews of Sun Valley
Overall 4.5 Based on 9 votes and 9 reviews
- Snowsure
- Variety of pistes
- Vote
- Dave from United States writes:
Sun Valley remains one of the best destination resorts in the country. Highlights include long, unbroken vertical with excellent steepness. I've never seen a lift line longer than 5 minutes on the busiest day of the season - 95% of the time there is zero line. While the excellent groomed skiing gets attention, most people don't know the extent and variety of the lift accessed side country, it's truly excellent when in condition. Additionally, there is nearly endless (and empty) backcountry skiing from 5 to 45miles away. Everything from massive alpine couloirs to empty cruisy powder fields. And all of that terrain gets 2-3x the snowfall of the resort (particularly) further north. 90% of my backcountry tours I don't see another person or cross a track. Last but not least, Ketchum/Sun Valley has one of the few actual ski towns in North America. A real town, with a great laid back, fun vibe, is walking distance to the mountain itself. Free buses around town make a week in Sun Valley one of the most accessible apres towns I've ever visited.
Visitor Reviews of Sun Valley
Dave from United States writes:
Sun Valley remains one of the best destination resorts in the country. Highlights include long, unbroken vertical with excellent steepness. I've never seen a lift line longer than 5 minutes on the busiest day of the season - 95% of the time there is zero line.
While the excellent groomed skiing gets attention, most people don't know the extent and variety of the lift accessed side country, it's truly excellent when in condition. Additionally, there is nearly endless (and empty) backcountry skiing from 5 to 45miles away. Everything from massive alpine couloirs to empty cruisy powder fields. And all of that terrain gets 2-3x the snowfall of the resort (particularly) further north. 90% of my backcountry tours I don't see another person or cross a track.
Last but not least, Ketchum/Sun Valley has one of the few actual ski towns in North America. A real town, with a great laid back, fun vibe, is walking distance to the mountain itself. Free buses around town make a week in Sun Valley one of the most accessible apres towns I've ever visited.
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