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snowy resort
Lat Long: 40.62° N 140.33° E

Weather Forecast for Iwakisan Hyakuzawa at 565m altitude

Issued: 2 pm 30 Jun 2026 (local time)

Forecast update in  hr  min

Is Iwakisan Hyakuzawa snowsure?

The snowiest week in Iwakisan Hyakuzawa is week 4 of December. There are typically 5.8 snowy days during this week with 47cm of snowfall. Check out the Iwakisan Hyakuzawa Snow History graphs below. Select any week of the year to see the typical Ski Conditions, Snowfall Amount and Temperature based on nowcast weather data over the last 11 years.

Average monthly snow in Iwakisan Hyakuzawa

MonthSnow amount (week)Snow days (week)
December37cm5.1 days
January42cm6.2 days
February36cm5.5 days
March16cm3.7 days
April3cm1.1 days

Average Snow and Weather Conditions in Iwakisan Hyakuzawa during June (week 4):

The average snowfall forecast during week 4 of June for Iwakisan Hyakuzawa is 0 cm. There are typically 0.0 snowy days during this week. Iwakisan Hyakuzawa typical weather and snow conditions during the last week of June at the middle elevation of the ski area at 565m, based on historical averages over the last 18 years: At this time of year the typical freezing level (3923m) is far above the middle elevation of Iwakisan Hyakuzawa. is unlikely in Iwakisan Hyakuzawa at the end of June but on average there are three days during this week each year when it rains Usual temperatures are well above freezing both day and night at the middle elevation in Iwakisan Hyakuzawa during week four of June with the average afternoon temperature 17.8°C and the minimum temperature 16.7°C. On average, two days out of seven will have some sunshine. Mostly light winds (average 13km/h) but there is a 50% chance that the mean wind speed will exceed more than 30km/h one day.


Snow History: Compare Resorts


Compare Iwakisan Hyakuzawa with:

Snow Depths

Recorded snow depths for the upper and lower slopes in Iwakisan Hyakuzawa and (2007 – 2026).

Winter
Summer

Iwakisan Hyakuzawa


Lower Slopes
Upper Slopes
Fresh Snow

Average Snow Conditions in

Best ski days per week in Iwakisan Hyakuzawa and (2007 – 2026)

Winter
Summer

Bluebird Powder Day
(Fresh snow, mostly sunny, light wind)
Powder Day
(Fresh snow, limited sun, any wind)
Bluebird Day
(Average snow, mostly sunny, light wind)
Very windy days
(>30km/h)

The most cherished days on the mountain in Iwakisan Hyakuzawa are Bluebird Powder days when it is mostly sunny with light winds following very recent snowfall. Poorer weather conditions may prevail on Powder days when the visibility can be limited but the snow is significantly deep and fresh for keen powder-hounds. Bluebird days can suit many skiers that aren’t necessarily hunting powder but want to enjoy the snowy mountains in sunnier conditions and light winds.


Average Snowfall in

Graph showing the average precipitation (snow/rain) in Iwakisan Hyakuzawa and (2007 – 2026)

Winter
Summer

Snowfall amount
(bar chart)
Days with significant snowfall.
(>5cm)
Days with significant rainfall.
(>5mm)

The snowiest weeks of the year in Iwakisan Hyakuzawa are shown but also bear in mind the number of days that it typically snows each week if you want regular fresh tracks. The risk of a rainy day is shown but be sure to switch between elevations to see if lower lifts are rain affected or higher lifts remain snowy despite any rain further down the mountain.


Average Temperature in

Graph showing the average temperature and freezing level at Iwakisan Hyakuzawa and (2007 – 2026)

Winter
Summer

Average temperature
Maximum
Minimum
Temperatures
Above freezing
Below freezing
Freezing level
Dashed line

The highest and lowest temperatures averaged for each week of the year in Iwakisan Hyakuzawa are shown. Check out the risk of freze-thaw conditions prevailing at different elevations for any given week. We also show the extremes of temperature (blue/red dots) that reveal the chance of unusually warm or cold conditions.