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Happo-One ski resort

Asia

Happo-One Snow Forecast

Closed for the season

Best months to book: January, March, February · last season + 30-yr record

Closed for the season closed April 26

Weather data is still collected for informational purposes.

Last Snowfall

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Past 24 Hours

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7-Day Forecast

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Snow Depth

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Updated: Sep 23, 6:04 AMWeather at base: 800m
SnowSure™ Score2025-26 season
Closed for the season

Happo-One is closed for the season. Here is when it is usually best to book.

Best months to book: January, March, February. Best weeks: 20 Mar–25 Mar, 27 Mar–2 Apr, 3 Apr–9 Apr.Dec1Jan3Feb2MarAprOpens 1 DecCloses 26 Apr

January

#1 to book

170cm avg

March

#2 to book

98cm avg · scored 28.5

February

#3 to book

123cm avg

Best weeks to book

  1. #120 Mar25 Marscored 33.8
  2. #227 Mar2 Aprscored 22.7
  3. #33 Apr9 Aprscored 26.3

Ranked on 25% last season's SnowSure score (2025-26) · 75% 30-year snowfall and base-depth record. The live score returns when the lifts turn.

Snow Summary

1,831m

Updated Sep 23, 2026 at 6:04 AM

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7-Day Forecast
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Prev10d
Now23
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Days 814 and every model are in Pro.Unlock with Pro
Past
Today
Forecast

Hourly Forecast

23 Wed
16° /
24 Thu
16° /
25 Fri
15° /
26 Sat
10° /
27 Sun
15° /
28 Mon
13° /
29 Tue
15° /
Days 8–14 and every model are in SnowSure Pro.Unlock with Pro
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight30 Wed1 Thu2 Fri3 Sat4 Sun5 Mon6 Tue
Conditions🌧️🌧️🌧️🌧️☁️🌤️🌧️☁️🌧️🌧️☁️🌧️☁️🌧️🌧️🌧️🌧️🌧️🌧️
light drizzlelight rainsome cloudslight drizzlelight drizzlecloudymostly clearlight drizzlecloudylight rainlight drizzlecloudysome cloudslight drizzlecloudydrizzlelight rainlight drizzlelight drizzlelight drizzlelight drizzle
Summit1,831 mModeled
Temp°C13°15°10°12°14°11°11°14°10°11°14°12°12°10°14°15°11°
Feels like°C13°15°10°12°14°11°10°13°11°14°12°13°10°14°15°11°
Snowcm·····················
Precipmm0.88.67.12.40.52.2·0.50.110.21.79.4·1.60.26.69.92.30.81.63.5
Windkm/h344462143212212343423
Mid-mountain1,316 mModeled
Temp°C16°18°14°16°18°14°15°17°12°12°13°12°15°17°12°15°16°13°18°18°14°
Feels like°C17°20°14°17°19°15°14°18°12°13°14°12°15°19°12°16°17°14°18°20°15°
Snowcm·····················
Precipmm0.88.67.12.40.52.2·0.50.110.21.79.4·1.60.26.69.92.30.81.63.5
Windkm/h344462143212212343423
Base800 mModeled
Temp°C20°21°17°19°21°18°18°20°15°16°16°15°18°21°15°18°19°17°21°22°18°
Feels like°C22°25°19°21°23°20°18°22°16°17°18°17°20°23°17°21°22°19°23°24°20°
Snowcm·····················
Precipmm0.88.67.12.40.52.2·0.50.110.21.79.4·1.60.26.69.92.30.81.63.5
Windkm/h344462143212212343423
Humidity%8593999379966777959696988583100989897808296
0°C linem
Sunhours

Freeze line is the height where rain turns to snow. Plain: straight from the models. Marked ○: estimated from temperature. Sun is hours of actual sunshine, not day length; blank means we have no reading.

Forecast Range · SnowSure Pro

Every model for Happo-One, side by side for 14 days

Where the models agree, where they split, and which one has been most accurate here. Free for 14 days, then yearly.

Unlock with Pro

SnowSure™ blend — verified model weighting

The black line is not a simple average. For Happo-One (japan), we combine seven global weather models using weights learned from daily forecast verification — comparing each model's prediction to measured snowfall (SNOTEL, resort reports, ERA5).

  • 1.Horizon buckets: days 1–3, 4–7, and 8–14 each get separate weights — short-range skill differs from long-range.
  • 2.Regional calibration: weights come from verified error in this geography (Rockies, Alps, Japan, etc.), recalculated weekly.
  • 3.Ground truth only: we never grade a forecast against another model — only against measured snow.

Building verification history for this resort.

How we verify forecasts →

Snowfall Forecast Maps

Japanese Alps region

El Niño Outlook · Winter 2026-27

Happo-One El Niño rank & forecast

Happo-One ranks #279 of 488 SnowSure resorts — Tier D, −5% in strong El Niño winters.

Tier DLate bloomer — aim Feb–Mar: Often a bit lighter early (−3% to −8% vs normal). History favors waiting for peak-depth months (often Feb–Mar) rather than skipping the resort.

#279 of 488Tier DLate bloomer — aim Feb–Mar

Strong-event signal: −5% vs this resort's 30-yr avg

In the three strongest El Niño winters on record ('97-98, '15-16, '23-24), Happo-One (Hakuba) averaged -5% versus its own 30-year snowfall baseline. Not a warning — a scheduling note. El Niño winters here tend to hit the season's edges hardest — Japan's big snow window runs mid-December to mid-February, and the January–February core signal is closer to neutral. Aim the mid-winter core (January to mid-February) for winter 2026-27. Analog winters: '97-98 -24%, '15-16 -33%, '23-24 +42%.

'97-98 −24%'15-16 −33%'23-24 +42%

ENSO seasonal analog

History · not a forecast

In 10 past El Niño winters at Happo-One, ERA5 season snowfall median was 583 cm (230 in), about 3% above this resort’s long-term median. This is a historical analog from reanalysis — not a prediction of this winter’s storm track.

Prevailing ONI

El Niño

JJA 2026 · ANOM +1.8°C

Analog season median

583cm

10 El Niño winters · 3% above median

All-season median

566cm

Across 30 ERA5 seasons (2026-27)

PhaseSeasonsMedianp25–p75Recent analogs
El Niñocurrent10583cm474cm – 688cm2023, 2019, 2018, 2015, 2014, 2009
La Niña12574cm511cm – 722cm2022, 2021, 2020, 2017, 2011, 2010
ENSO-neutral8559cm480cm – 725cm2025, 2024, 2016, 2013, 2012, 2003

Season snowfall from Open-Meteo ERA5 reanalysis (~9 km). ENSO phase from NOAA CPC Oceanic Niño Index. Relative phase differences are more trustworthy than absolute cm totals. Source: NOAA CPC Oceanic Niño Index + Open-Meteo ERA5 via SnowSure season archive.

Local Reports

0 reports

How accurate is this forecast?

We verify every forecast against what actually fell — see the model-by-model results.

Frequently asked questions about Happo-One

How much snow is Happo-One getting this week?
No significant snow is forecast at Happo-One over the next 7 days.
What is the 14-day snow forecast for Happo-One?
The full 14-day forecast for Happo-One — the SnowSure™ blend and every model we track, day by day — is part of SnowSure Pro. The first 7 days are free on this page.
How accurate are SnowSure forecasts for Happo-One?
We verify every forecast against what actually fell and publish the results — see our forecast verification pages for model-by-model accuracy, updated continuously.