Japan Snow Forecast 2026-27: How Is the Snow This Year, and Should You Trust the Long Range Forecast?

Every autumn I share the long range winter forecast, and every autumn someone tells me it's useless. This year the forecast has real news in it, so it's worth asking properly whether it's useful, and for whom. My answer is that it depends on what you're asking it to do. It's a poor tool for finding a powder day and a good one for planning a season, and those are two very different jobs.

What the forecasts say for winter 2026-27

The Japan Meteorological Agency released its cold-season outlook on 18 September, and the headline is a warm winter. El Niño is expected to continue through winter, which weakens the pressure pattern that normally drives cold air and snow onto the Sea of Japan coast. Temperatures from December to February are expected to be above normal across eastern and western Japan, and normal to above in the north. On snow, the outlook is normal to below normal on the Sea of Japan side of northern Japan, and below normal on the Sea of Japan side of eastern and western Japan. tenki.jptenki.jp

The regional offices agree. The Niigata Local Meteorological Observatory's outlook for the Hokuriku region, which includes Niigata, calls for a warm, low-snow winter, with temperatures high, precipitation about normal, and snowfall low. In Hokkaido, the Sapporo outlook has temperatures normal to above, with Sea of Japan side snowfall normal to below. Joetsutjtenki.jp

The driver is a strong El Niño. A forecaster's column summarising JMA data notes that July's sea-surface anomaly in the monitoring area tied the record for July set in 1997, that the chance of El Niño lasting through winter is put at 100%, and that the gap is forecast to reach a record by winter. None of this is final, though. The outlook will be reviewed alongside the 20 October three-month forecast and revised if needed, and I'll update this article when it is. Yahoo!ニュースTenki.jp

Why people call it useless, and where they're right

The critics have a point, starting with what a seasonal forecast is. JMA describes it as a rough picture of the weather across a whole month or three months, given in three categories with probabilities, and says plainly that it can't tell you the weather on a specific day. If you're booking a week in February and hoping the forecast will tell you whether it dumps on Tuesday, it can't. Japan Meteorological Agency

There's also a quirk in how "accuracy" works. JMA doesn't score itself on hit rate. It checks whether its stated probabilities were reliable, so that a 50% call should come true about half the time. That means a forecast can be well calibrated and still look wrong on the one week you happened to be here. jma

The bigger issue for skiers is that good snow days come from short-term setups. The Nagano observatory explains that heavy snow in northern Nagano and Hokuriku depends on how cold the upper air is and which route the cold air takes. A three-month outlook can't see that. Japan Meteorological Agency

Forecasts also miss. A widely followed private outlook expected a cold winter for 2025-26, yet JMA's own summary says temperatures ended up above average across the country, though snowfall on the Sea of Japan side came in near normal. And averages hide extremes. Sapporo forecasters warn that even in a lower-snow winter, storm-driven dumps in some spots may be more likely than usual. ウェザーマーケティングレポート Vol.4 2026年の天候予想 2026年は夏の到来は早く、猛暑で多雨の年に～晩夏から秋は長雨・台風に注意～ | ニュース | 日本気象協会 +2

Why I still use it

The case for the forecast is that it shifts the odds, and this year the signals line up. JAPOW CAST notes that El Niño winters tend toward warm, low-snow conditions, but with large variation by region and year, and that a cold snap can still bring a real dump. BACKSIDE makes a similar point from the snowboard side: Japan's winter also depends on the Siberian High, cold air flow, the Arctic Oscillation, and storm tracks, so a strong El Niño isn't a promise of low snow. But they call it a signal you can't ignore. I agree with both. JAPOW CAST BACKSIDE

Where the forecast is worth it for international visitors planning a trip is for those looking at booking at the edges of the season. Last spring, Hakuba Norikura Onsen ended its season early because of higher-than-expected temperatures and melt. Meanwhile, Akakura Onsen in Myoko closed the same season reporting anywhere from 50 to 200 cm of snow and describing it as another good snow year (although personally, I would argue against it and say the snow melted QUICK last season). A warm winter can be great in the middle and short at either end, and that's exactly the kind of thing a seasonal outlook helps you think about. Hakunori Myokotourism

For those of us who live here, it's even more useful. I use it to work out how much time I have to prepare, what to prepare for, and what kind of season to expect, and to set expectations with guests before they arrive. In my experience, over the last five winters it has been right about 80% of the time. That's my own tally of what the outlook said versus what actually happened, not JMA's scoring method. It's good enough to plan a season with, and not good enough to bet a powder day on. [Add one real example from a past winter.]

What it means if you're travelling

My view is that this winter's signal is strong and consistent enough to plan around, but not strong enough to cancel a trip over. If you have flexibility, aim for mid-January to February, which is the safest window in most winters, and be more careful with early (and even late) December (in some areas) and with March and April, when a thin base or an early melt is the real risk. If you're weighing up dates, I cover this in more detail in my video.

On where to go, the honest answer is that the outlooks are broad regional calls, not resort forecasts. On paper, Hokkaido's outlook of normal to below-normal snow is a step better than the below-normal call for Honshu's Sea of Japan side, which matters if you're choosing between Niseko and somewhere like Hakuba or Myoko. JAPOW CAST's advice for a warm-outlook winter is to favour higher-elevation and northern or inland areas, and to check upper-air temperature and snowfall peaks the night before and the morning of your ski day. That fits what I'd tell anyone: use the seasonal outlook to pick your window and your region, then let the short-range forecast pick your day. JAPOW CAST

If I were to choose one spot it actually would be generally be less related to the snow and more related to the bigger goal of the trip to Japan. If I really had to dial into one location it would probably be up north of Honshu where it can be colder and at a mountain with higher elevation.

When to ski in Japan - A General Overview of The Japan Ski Season Timing

Where Orija fits

I run hosted ski stays here, and I use the forecast to tell guests what kind of winter to expect long before they arrive, so nobody turns up with the wrong picture. If you'd like to see the season from the inside, come and stay. There is more than chasing snow in Japan.

I also make Orija tees and hoodies that represent what I care about: adventure, exploration, and growth.