Hachimantai 7-Day Snow Forecast

Hachimantai Long-Range Snow Forecast Updated today

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Updated 22 May 2026 20:40 PDT

Long-Range Snow Forecast for Hachimantai

Long-range (14 to 45 days) from 23 May.

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 (3,937ft)
Next Snow?
There is no snow currently in the forecast for Hachimantai.

Long-range Snow Outlook for Hachimantai

Snowfall

Snow Line

Max 68°F
Min 40°F

Snow unlikely

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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
Sat 23	Fair.	Max 57°F Min 41°F
Sun 24	Light drizzle.	Max 51°F Min 40°F
Mon 25	Clear sky.	Max 67°F Min 50°F
Tue 26	Clear spells.	Max 68°F Min 46°F
Wed 27	Clear spells.	Max 65°F Min 49°F
Thu 28	Light drizzle.	Max 64°F Min 54°F
Fri 29	Light drizzle.	Max 61°F Min 48°F

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 20:40 PDT, next update expected 02:00 PDT.

Ensemble forecast for Hachimantai, Japan at 3,117ft

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.