Numajiri 7-Day Snow Forecast

Numajiri Long-Range Snow Forecast Updated today

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Updated 16 August 2026 10:46 PDT

Long-Range Snow Forecast for Numajiri

Long-range (14 to 45 days) from 16 August.

For Forecast detail, see below.

Numajiri Snow Forecast Highlights

When will there be fresh snow in Numajiri?

Numajiri Snow Forecast Highlights - JMA
Snowfall prediction at mid-mountain (3,396ft)
Next Snow?
There is no snow currently in the forecast for Numajiri.

Long-range Snow Outlook for Numajiri

Snowfall

Snow Line

Max 78°F
Min 62°F

Snow unlikely

Numajiri 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 Numajiri from OpenMeteo(JMA)
	Snow and Weather	Temp Town
Sun 16	Fair.	Max 75°F Min 64°F
Mon 17	Fair.	Max 72°F Min 62°F
Tue 18	Fair.	Max 75°F Min 64°F
Wed 19	Fair.	Max 78°F Min 65°F
Thu 20	Drizzle.	Max 74°F Min 63°F
Fri 21	Fair.	Max 77°F Min 65°F
Sat 22	Clear spells.	Max 75°F Min 63°F

No significant snowfall is forecast for this period.

This Snow Forecast for Numajiri, 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 Numajiri, on any given trail 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.

Numajiri Snow Forecast updated at 10:46 PDT, next update expected 16:00 PDT.

Ensemble forecast for Numajiri, Japan at 2,789ft

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

Numajiri enjoys a consistent snow cover, with average snow depths reaching up to 2 meters during peak season. For the latest snow conditions, check J2Ski for reliable updates.

Off-Piste Safety in Numajiri

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