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Japan is a truly magical land with beautiful but severe seasons. A mountainous nation of islands stretching over a large range of latitudes, Japan is home to hundreds of micro-climates from the tropics of Okinawa, to the snowy mountains of the Alps and Hokkaido and everything in between.
In this article I will focus on the main island of Honshu and present a brief overlook of the seasons. If you want to cycle in Japan during its optimal seasons, just join one of our guided group tours. We have specifically scheduled all of our group guided tours to capture the best of each region.
The Four Seasons 四季
Japan has four distinct seasons broken into Spring, Summer, Fall, and Winter (in Japanese, Haru 春, Natsu 夏, Aki 秋, and Fuyu 冬).
Interestingly, the Japanese believe the year begins with the spring. Therefore, all calendar years for business or school begin on April 1st.
Though temperature patterns mimmic much of the northern hemisphere in the west, with the warmest time of year in the summer and the coldest in the winter, the precipitation is almost the opposite.
Most of Europe and North America experiences the wettest and cloudiest time of year in the winter. But in Japan the wettest cloudiest time of year is actually the peak of summer, in the months of mid June through mid September.
This is not to say there is any lack of snow in Japan in the winter, but this tends to be in the Alps, where there are plenty of ski resorts. In fact, much of Japan has a largely cold, dry, and sunny winter season.
Spring in Japan 春 | Warm Air, Cherry Blossoms, and Flower Parks
Mid-March through Mid-June
Spring is a wonderful time in Japan. It is the only season where you can ski an alpine mountain in the morning and go for a bike ride in short sleeves in the afternoon.
It is also when everything begins to bloom, and the whole of the countryside lights up with cherry blossoms, azaleas, wisteria, and a rainbow of wildflowers.
In the Kita-Kanto Region the days can range from cool to hot, and precipitation is usually around 2-3x per week in brief drizzly rain showers. Meanwhile, the high mountains to the west can get significantly more clouds and fresh snow to spring rain.
Snow still sits on the mountain peaks, but typically by mid April in Kita-Kanto all of the high roads are accessible and warm enough to ride.
Summer in Japan 夏 – “Everything is Green” Season
MID-JUNE THROUGH MID-SEPTEMBER
Summertime in Japan is a rollercoaster. A sandwich of two rainy seasons with a heatwave in between. Japanese summers can be a tricky beast to navigate, but still contain some amazing riding.
Summer is typically broken into three parts, the “rainy season” Tsuyu 梅雨, August, and Typhoon Season.
They each last around a month. Within just three months, about 70% of the yearly rainfall occurs, making for a wet and wild couple of months.
Average daily highs on the main island of Honshu can easily hit 30-35°C (86-95°F) in July and August and lows around 20-25°C (68-77°F) are the norm. Unless you are at altitude or in Hokkaido, and most of Japan is not, expect the sun to rise as early as 4:30am. Couple this with humidity reaching 90-100% regularly and you have what I like to call the “Rainforest Season” of Japan.
EVERYTHING WILL BE GREEN. Or blue, if you are Japanese.
PART 1: TSUYU, OR PLUM RAIN 梅雨
In Tsuyu (mid-June to mid-July), expect moist dense air and lots of low clouds, mist, and fog with frequent bands of rain washing over the mountains.
Roads less traveled frequently turn green this time of year with moss. Be very cautious! Wet moss on rubber can become extremely slick. There is an average of 17 days of precipitation for most of Japan in this time.
Even on days that are not raining, don’t expect too much sun. Though not impossible, a big blue sky, or clear visibility this time of year is very very rare.
Also worth note is that this is peak heat + humidity time so hydration and care not to over exert oneself is crucial.
But with all of that this is the only time of year you will see the flooded rice paddies, something that can be truly mesmerizing to ride through.
Part 2: August, AKA The Heat Wave
Once Tsuyu is over, the second wave of summer begins, typically around the end of July or beginning of August. I like to call this the “Heatwave” period. This can be as short as a week or two, or as long as a month long.
Though rain is no longer wafting through the air on in dense low clouds, instead expect pleasant but hot semi-humid mornings that build to big afternoon showers or thunderstorms most days.
This time of year, while still hot and humid, can often be a great time to get out early as the sun rises at around 4am and you can get a great ride in the forest canopied roads before it gets too hot.
If you are in the high mountains, this is a great time for rides as the heat is far less intense up there. Midday rain showers are still present even up high.
We like to head up to the high mountains of Gunma, Tochigi, and Nagano Prefectures at this time of year. Our top recommendations for places to ride include: Hakuba Valley, Mount Akagi, Mount Haruna, and Kusatsu Onsen Town.
Part 3: Typhoon Season 台風
In the Americas they call this Hurricane Season, and that’s exactly what a typhoon is, a tropical storm. Typically beginning mid August and running into mid or late September this season is still decently hot, but less so than August.
Though it may rain some quarter of the days this time of year, the rain falls quickly and swiftly. As the storms move in expect a day of strong wind followed by a day of torrential downpours. But! The day after will often be the best day of the year.
You heard me right, the day after a typhoon is just heaven. The storms come in, suck up all the moisture, dump it, and leaves. And with that you get crystal clear days, low humidity, and beautiful weather.
This is a pretty great time of year to ride as you usually only miss one day out of a week to a big storm, and the other days tend to have pleasant to amazing weather.
It can still be hot, but usually it’s only humid when it rains, and there is moderately dry air when it’s sunny.
Fall in Japan 秋 – Crisp, Cool, Colors and Clear Skies
Fall in Japan is my favorite season for riding. The second sunniest season (only to winter) fall delivers consistent strings of warm sunny days. Highs of 15°C even into December are common for the Kita-Kanto Region. Lows can hit freezing, but on most days, by 9am, the sun is high and the air is dry – perfect weather for cycling.
Skies are clear most days, leaving room for a big warm sun that instantly makes it feel 5°C warmer than the current temperature. The air is also cool, so breezes are refreshing and welcome.
It’s a layers time of year for sure, but a safe rule of thumb is if you are in the sun, it’s short sleeves and sunglasses. And, if you are in the shade you will probably want an extra layer or jacket.
Late September, October, November, and even through mid-late December can be a real treat to ride in. Especially because of the ever moving fall foliage down the mountains into the valleys.
Winter in Japan 冬 – Sun, Snow, and Wind
Winters in Japan are very depended on where you are. The east side of Japan (Kanto & Kita-Kanto) has its sunniest season, while the westside of Honshu is getting pummeled with snow and is starved for sunlight.
In general, you can expect eastern Japan to have cold to frigid evenings with cool to even warm days. Big warm sunny skies and a decent cold wind blowing are the key features. You’ll want a few layers to block the wind and you will often find yourself unzipping on the way up and zipping back up for the descents.
On the west side of Japan and in the high mountains, expect buckets of clouds and snow, perfect for skiing. But even there the occasional bluebird days can be had if you are lucky!
Riding this time of year is really quite nice and just requires some layers. Full length pants, jackets, and gloves are a must, but you will still want to dress in layers as it is still warm in the sun.
This is also one of the best times of year for visibility, a great time to get to the top of the mountain and soak in the views.
Why Ride in the Kita-Kanto Region?
In the Kita-Kanto Region, where most of our tours take place, we love the fact that we live in one of the sunniest area in Japan. It is also THE DRIEST area in all of Japan, meaning we get less rain, humidity, and clouds than anywhere else!
What does this mean for you as a rider? This means the best weather for cycling!
Spring in this region brings warmer weather faster, meaning that we can easily be in short sleeves by early March. Summer is less rainy, meaning less wet rides compared to other areas. Our Fall is drier and sunnier meaning longer fall colors and more clear skies to see them in. And our winters are the least wet, and even as warm as southern Japan, meaning you can get lots of warm sun all day.
Now that all sounds pretty great, so what’s the catch? Remember that “Heatwave” in August I mentioned? Well Kita-Kanto has the hottest August in Japan. As in it can hit 40°C+ and not get below 30°C in August.
It’s certainly not every day, and many days will be very enjoyable to ride in the mornings in August. But, that’s the price we pay for an otherwise incredible 11 month long riding season.
We can’t wait to welcome you to the best of this region!
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