Happo One 7-Day Snow Forecast

Happo One Long-Range Snow Forecast Updated today

ECMWF IFS

GFS

JMA

PROSubscribe to Switch Weather Model

Updated 12 June 2026 09:45 NZST

Long-Range Snow Forecast for Happo One

Long-range (14 to 45 days) from 11 June.

For Forecast detail, see below.

Happo One Snow Forecast Highlights

When will there be fresh snow in Happo One?

Happo One Snow Forecast Highlights - JMA
Snowfall prediction at mid-mountain (1,296m)
Next Snow?
There is no snow currently in the forecast for Happo One.

Long-range Snow Outlook for Happo One

Snowfall

Snow Line

Max 28℃
Min 9℃

Snow unlikely

Happo One 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 Happo One from OpenMeteo(JMA)
	Snow and Weather	Temp Town
Thu 11	Fair at altitude, cloudy below.	Max 21℃ Min 15℃
Fri 12	Light drizzle.	Max 20℃ Min 13℃
Sat 13	Clear sky.	Max 23℃ Min 11℃
Sun 14	Clear sky.	Max 25℃ Min 15℃
Mon 15	Cloudy.	Max 22℃ Min 10℃
Tue 16	Clear sky.	Max 25℃ Min 9℃
Wed 17	Clear spells.	Max 28℃ Min 11℃

No significant snowfall is forecast for this period.

This Snow Forecast for Happo One, 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 Happo One, 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.

Happo One Snow Forecast updated at 09:45 NZST, next update expected 12:00 NZST.

Ensemble forecast for Happo One, Japan at 760m

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.

Japan Accommodation (Apartments, Chalets, Hotels) Map

Snow Reliability

Happo One typically enjoys reliable snow conditions, with an average snow depth of 3 to 4 meters during peak season. For the latest snow reports and updates, check J2Ski.

Off-Piste Safety in Happo One

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