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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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Osa at 865 m altitude
Issued by Snow-Forecast.com at: 8 pm (local time) / 18 Dec 2025
Now
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | ||||||||||||
night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  | |  | |  |  |  | | |  | | | | |  | |
clear | some clouds | some clouds | some clouds | some clouds | cloudy | mod. rain | mod. rain | some clouds | some clouds | clear | clear | some clouds | some clouds | cloudy | light rain | |
km/h | ||||||||||||||||
Snow map |  |  |  |  |  |  | ||||||||||
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
— | — | — | — | — | — | 6 | 8 | — | — | — | — | — | — | — | 4 | |
max °C | 6 | 10 | 9 | 9 | 13 | 12 | 11 | 8 | 4 | 1 | 2 | 3 | 4 | 9 | 9 | 10 |
min °C | 6 | 7 | 7 | 7 | 10 | 11 | 11 | 5 | 2 | 0 | 2 | 2 | 3 | 6 | 8 | 8 |
6 | 5 | 3 | 3 | 8 | 9 | 8 | 0 | -3 | -5 | -3 | 0 | 1 | 3 | 4 | 4 | |
51 | 44 | 67 | 76 | 80 | 74 | 94 | 97 | 78 | 86 | 77 | 63 | 44 | 38 | 84 | 97 | |
2550 | 2700 | 2500 | 2700 | 2700 | 2850 | 2950 | 2600 | 1450 | 950 | 1100 | 1200 | 2250 | 2550 | 2600 | 2700 | |
 | — | 7:11 | — | — | 7:13 | — | — | 7:13 | — | — | 7:13 | — | — | 7:15 | — | — |
 | — | — | 5:01 | — | — | 5:02 | — | — | 5:02 | — | — | 5:04 | — | — | 5:04 | — |
Next 0-3 days weather summary:
Moderate rain (total 14.0mm), heaviest on Sun morning. Very mild (max 13°C on Sat morning, min 2°C on Sun afternoon). Winds increasing (calm on Thu night, fresh winds from the SSW by Sat night).
Next 4-6 days weather summary:
Moderate rain (total 18.0mm), heaviest on Wed morning. Freeze-thaw conditions (max 10°C on Tue night, min 0°C on Sun night). Winds increasing (light winds from the S on Mon night, strong winds from the SSW by Tue night).
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Snow Radar
Latest snow reports near Osa:
Osa Snow Conditions
| Top snow depth: | — |
|---|---|
| Bottom snow depth: | — |
| Fresh snowfall depth: | — |
| Last snowfall: | 13 Dec 2025 |
| Snow Alerts | Create Alert |
Other resorts in Japan - Hiroshima are reporting: powder (0) / good piste (0)
Snow History
Week 3 of December has on average:
0.1 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
1.5 | Powder days Fresh snow, limited sun, any wind. |
0.5 | 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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