Biwako Valley 7-Day Snow Forecast

Biwako Valley Long-Range Snow Forecast Updated today

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Updated 23 May 2026 03:41 NZST

Long-Range Snow Forecast for Biwako Valley

Long-range (14 to 45 days) from 22 May.

For Forecast detail, see below.

Biwako Valley Snow Forecast Highlights

When will there be fresh snow in Biwako Valley?

Biwako Valley Snow Forecast Highlights - JMA
Snowfall prediction at mid-mountain (1,057m)
Next Snow?
There is no snow currently in the forecast for Biwako Valley.

Long-range Snow Outlook for Biwako Valley

Snowfall

Snow Line

Max 21℃
Min 10℃

Snow unlikely

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Biwako Valley Long-Range (2 weeks+) Snow Forecast Outlook

Note :- Mountain weather is extremely dynamic; the forecast below will change. Any forecast snow may move forward or back in the forecast, and predicted snowfall depths will be revised in subsequent updates.

16 Day Weather and Snow Forecast for Biwako Valley from OpenMeteo(JMA)
	Snow and Weather	Temp Town
Fri 22	Light drizzle.	Max 15℃ Min 12℃
Sat 23	Clear spells.	Max 19℃ Min 12℃
Sun 24	Fair.	Max 18℃ Min 12℃
Mon 25	Clear spells.	Max 19℃ Min 11℃
Tue 26	Light drizzle.	Max 20℃ Min 10℃
Wed 27	Light drizzle.	Max 20℃ Min 15℃
Thu 28	Light drizzle.	Max 21℃ Min 15℃

No significant snowfall is forecast for this period.

This Snow Forecast for Biwako Valley, Japan gives the predicted Snowfall and Freezing Levels for the next week.

The forecast snowfall depths given are the likely average accumulations for the Lower and Upper slopes. The actual snow depth in Biwako Valley, on any given piste or itinerary, may be dramatically different, particularly if the snowfall is accompanied by high winds and/or varying air temperatures.

Snow Forecasts beyond two days ahead are subject to significant change and variable reliability.

Biwako Valley Snow Forecast updated at 03:41 NZST, next update expected imminently.

Ensemble forecast for Biwako Valley, Japan at 940m

Daily Mean Temperature (yellow line is control)

Daily Total Precipitation (blue line is control)

What are Forecast Ensembles ? Multiple forecasts from running the same weather model with slightly different inputs. The prominent line (the 'control') is the model output from standard inputs, the thinner lines are the variations. Plotted together, they show a range of possible outcomes; the closer they are, the higher the confidence.

How to read Long Range Ensemble Forecasts

These forecasts are from ECMWF EC46, a long-range, low-resolution (area) model. They may not accurately reflect local conditions and should be read as area forecasts, indicating whether the coming weeks are likely to be warmer, colder, wetter, or drier than average.

What to look for?

Temperatures trending downward at the same time as precipitation spikes upward... means snow!

Lines close together indicate a high confidence, while wider spreads signal uncertainty.

Snow Reliability

Biwako Valley typically sees a snow depth of around 1 to 2 meters throughout the season, with reliable snowfall from December to March. For the latest snow conditions, check updates on J2Ski.

Off-Piste Safety in Biwako Valley

Before skiing or snowboarding off-piste in Biwako Valley, you must assess the local snow conditions. Always check the local Avalanche Risk Level and ski with appropriate safety equipment.