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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 1030 m altitude
Issued by Snow-Forecast.com at: 2 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 | |
 |  |  | |  | | |  |  | | | | | | |  |  | |
clear | clear | some clouds | some clouds | some clouds | clear | some clouds | mod. rain | rain shwrs | some clouds | clear | some clouds | clear | clear | some clouds | light rain | light rain | |
km/h | |||||||||||||||||
Snow map |  |  |  |  |  |  | |||||||||||
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
— | — | — | — | — | — | — | 7 | 4 | — | — | — | — | — | — | 1 | 3 | |
max °C | 6 | 6 | 9 | 7 | 9 | 11 | 12 | 11 | 8 | 3 | 0 | 1 | 3 | 5 | 8 | 8 | 10 |
min °C | 5 | 5 | 7 | 6 | 6 | 9 | 11 | 9 | 4 | 1 | -1 | 1 | 2 | 3 | 7 | 8 | 8 |
5 | 5 | 4 | 1 | 2 | 6 | 8 | 6 | -1 | -4 | -7 | -4 | 0 | 0 | 3 | 4 | 4 | |
61 | 39 | 36 | 69 | 75 | 84 | 70 | 83 | 98 | 85 | 90 | 59 | 49 | 35 | 29 | 89 | 94 | |
1950 | 2550 | 2700 | 2450 | 2650 | 2650 | 2900 | 2950 | 2650 | 1400 | 950 | 1200 | 1600 | 2400 | 2850 | 2700 | 2700 | |
 | — | — | 7:11 | — | — | 7:13 | — | — | 7:13 | — | — | 7:13 | — | — | 7:15 | — | — |
 | 5:01 | — | — | 5:01 | — | — | 5:02 | — | — | 5:02 | — | — | 5:04 | — | — | 5:04 | — |
Next 0-3 days weather summary:
Moderate rain (total 11.0mm), heaviest on Sat night. Very mild (max 12°C on Sat afternoon, min 4°C on Sun morning). Winds increasing (calm on Thu afternoon, strong winds from the SW by Sat night).
Next 4-6 days weather summary:
Moderate rain (total 12.0mm), heaviest on Wed morning. Freeze-thaw conditions (max 10°C on Tue night, min -1°C on Sun night). Winds increasing (light winds from the ENE on Mon afternoon, strong winds from the SSW by Tue night).
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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:
0.2 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
1.7 | Powder days Fresh snow, limited sun, any wind. |
0.6 | 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 1030 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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