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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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Biwako Valley at 1062 m altitude
Issued by Snow-Forecast.com at: 2 am (local time) / 18 Dec 2025
Now
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | |  | |  |  | |  |  |  |  |  | | | | | | | |
clear | clear | clear | clear | cloudy | rain shwrs | clear | some clouds | some clouds | light rain | mod. rain | light rain | some clouds | some clouds | clear | clear | some clouds | some clouds | |
km/h | ||||||||||||||||||
Snow map |  |  |  |  |  |  | ||||||||||||
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
— | — | — | — | — | 2 | — | — | — | 1 | 6 | 3 | — | — | — | — | — | — | |
max °C | 0 | 3 | 5 | 7 | 8 | 7 | 9 | 10 | 10 | 10 | 8 | 6 | 3 | 3 | 3 | 5 | 5 | 5 |
min °C | 0 | 2 | 4 | 6 | 6 | 7 | 8 | 9 | 9 | 8 | 7 | 2 | 2 | 3 | 2 | 3 | 5 | 5 |
-7 | -4 | 2 | 4 | 2 | 3 | 5 | 6 | 6 | 5 | 4 | -4 | -4 | -2 | -2 | 0 | 1 | 0 | |
80 | 44 | 34 | 26 | 28 | 95 | 70 | 64 | 70 | 74 | 99 | 86 | 50 | 42 | 58 | 70 | 67 | 75 | |
1000 | 1400 | 2100 | 2550 | 2650 | 2600 | 2700 | 2750 | 3050 | 2800 | 2750 | 2000 | 1550 | 1750 | 1800 | 2000 | 2400 | 2600 | |
 | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:00 | — | — | 7:01 | — | — | 7:01 | — | — |
 | — | 4:45 | — | — | 4:45 | — | — | 4:46 | — | — | 4:46 | — | — | 4:47 | — | — | 4:47 | — |
Next 0-3 days weather summary:
Light rain (total 2.0mm), mostly falling on Fri night. Freeze-thaw conditions (max 10°C on Sat afternoon, min 0°C on Thu morning). Winds decreasing (fresh winds from the NNW on Thu morning, calm by Thu night).
Next 4-6 days weather summary:
Moderate rain (total 10.0mm), heaviest on Sun afternoon. Very mild (max 10°C on Sun morning, min 2°C on Sun night). Winds increasing (calm on Mon night, near gales from the SSE by Tue night).
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Snow Radar
Latest snow reports near Biwako Valley:
Biwako Valley Snow Conditions
| Top snow depth: | — |
|---|---|
| Bottom snow depth: | — |
| Fresh snowfall depth: | — |
| Last snowfall: | 14 Dec 2025 |
| Snow Alerts | Create Alert |
Other resorts in Japan - Shiga are reporting: powder (0) / good piste (0)
Snow History
Week 3 of December has on average:
1.2 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
0.7 | Powder days Fresh snow, limited sun, any wind. |
1.6 | Bluebird days Average snow, mostly sunny, light wind. |
Biwako Valley Forecast Snowfall
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Other resorts in Japan - Shiga are reporting: powder (0) / good piste (0)
The above table gives the weather forecast for Biwako Valley at the specific elevation of 1062 m. Our sophisticated weather models allow us to provide snow forecasts for the top, middle and bottom ski stations of Biwako 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 Japan.
Click here to read further information on freezing levels and how we forecast our temperatures.
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