Arai 7-Day Snow Forecast

Arai Long-Range Snow Forecast Updated today

ECMWF IFS

GFS

JMA

PROSubscribe to Switch Weather Model

Updated 11 August 2026 14:50 PDT

Long-Range Snow Forecast for Arai

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

For Forecast detail, see below.

Arai Snow Forecast Highlights

When will there be fresh snow in Arai?

Arai Snow Forecast Highlights - JMA
Snowfall prediction at mid-mountain (2,639ft)
Next Snow?
There is no snow currently in the forecast for Arai.

Long-range Snow Outlook for Arai

Snowfall

Snow Line

Max 83°F
Min 68°F

Snow unlikely

Arai 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 Arai from OpenMeteo(JMA)
	Snow and Weather	Temp Town
Wed 12	Light drizzle.	Max 76°F Min 69°F
Thu 13	Drizzle.	Max 77°F Min 70°F
Fri 14	Light drizzle.	Max 74°F Min 72°F
Sat 15	Light drizzle.	Max 77°F Min 72°F
Sun 16	Clear sky.	Max 79°F Min 70°F
Mon 17	Clear spells.	Max 83°F Min 68°F
Tue 18	Clear spells.	Max 83°F Min 72°F

No significant snowfall is forecast for this period.

This Snow Forecast for Arai, 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 Arai, 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.

Arai Snow Forecast updated at 14:50 PDT, next update expected 20:00 PDT.

Ensemble forecast for Arai, Japan at 1,079ft

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

Arai typically sees consistent snowfall throughout the winter, with average snow depths reaching up to 3 meters. For the latest snow conditions, be sure to check J2Ski for real-time information.

Off-Piste Safety in Arai

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