Hachimantai 7-Day Snow Forecast

Hachimantai Long-Range Snow Forecast Updated today

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Updated 13 August 2026 01:41 AEST

Long-Range Snow Forecast for Hachimantai

Long-range (14 to 45 days) from 12 August.

For Forecast detail, see below.

Hachimantai Snow Forecast Highlights

When will there be fresh snow in Hachimantai?

Hachimantai Snow Forecast Highlights - JMA
Snowfall prediction at mid-mountain (1,200m)
Next Snow?
There is no snow currently in the forecast for Hachimantai.

Long-range Snow Outlook for Hachimantai

Snowfall

Snow Line

Max 24℃
Min 13℃

Snow unlikely

Hachimantai 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 Hachimantai from OpenMeteo(JMA)
	Snow and Weather	Temp Town
Wed 12	Clear spells.	Max 21℃ Min 18℃
Thu 13	Light drizzle.	Max 21℃ Min 18℃
Fri 14	Light drizzle.	Max 21℃ Min 18℃
Sat 15	Fair.	Max 23℃ Min 13℃
Sun 16	Clear sky.	Max 23℃ Min 13℃
Mon 17	Fair.	Max 21℃ Min 14℃
Tue 18	Light drizzle.	Max 24℃ Min 17℃

No significant snowfall is forecast for this period.

This Snow Forecast for Hachimantai, 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 Hachimantai, 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.

Hachimantai Snow Forecast updated at 01:41 AEST, next update expected 07:00 AEST.

Ensemble forecast for Hachimantai, Japan at 950m

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

Hachimantai enjoys reliable snow conditions, with average snow depth reaching up to 2 meters during peak season. For the latest snow information, check J2Ski regularly.

Off-Piste Safety in Hachimantai

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