Niseko Grand Hirafu 7-Day Snow Forecast

Niseko Grand Hirafu Long-Range Snow Forecast Updated today

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Updated 23 September 2026 20:42 PDT

Long-Range Snow Forecast for Niseko Grand Hirafu

Long-range (14 to 45 days) from 24 September.

For Forecast detail, see below.

Niseko Grand Hirafu Snow Forecast Highlights

When will there be fresh snow in Niseko Grand Hirafu?

Niseko Grand Hirafu Snow Forecast Highlights - JMA
Snowfall prediction at mid-mountain (2,638ft)
Next Snow?
There is no snow currently in the forecast for Niseko Grand Hirafu.

Long-range Snow Outlook for Niseko Grand Hirafu

Snowfall

Snow Line

Max 66°F
Min 46°F

Snow unlikely

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Niseko Grand Hirafu 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 Niseko Grand Hirafu from OpenMeteo(JMA)
	Snow and Weather	Temp Town
Thu 24	Rain showers.	Max 66°F Min 51°F
Fri 25	Clear sky.	Max 62°F Min 46°F
Sat 26	Fair.	Max 64°F Min 50°F
Sun 27	Rain showers.	Max 63°F Min 54°F
Mon 28	Light rain.	Max 62°F Min 58°F
Tue 29	Clear sky.	Max 64°F Min 51°F
Wed 30	Light drizzle.	Max 62°F Min 50°F

No significant snowfall is forecast for this period.

This Snow Forecast for Niseko Grand Hirafu, 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 Niseko Grand Hirafu, 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.

Niseko Grand Hirafu Snow Forecast updated at 20:42 PDT, next update expected imminently.

Ensemble forecast for Niseko Grand Hirafu, Japan at 984ft

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

Niseko Grand Hirafu enjoys exceptional snow reliability, with an average snowfall of over 15 meters each season. Snow depths typically range from 1 to 3 meters, encouraging skiers to check J2Ski for the latest snow reports.

Off-Piste Safety in Niseko Grand Hirafu

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