SeasonMapKaruizawa weather in October
Japan
October in Karuizawa: cool, soaked, with clean air — fine if you can take 14 rainy days.
#8 of 12 months in Karuizawa · #980 of 1383 destinations to visit in October · comfort 66/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Karuizawa in October
Other months in Karuizawa
Karuizawa's forum calls May one of the most pleasant months — its elevation keeps it noticeably cooler than Tokyo, with a day-to-night temperature swing of around 10°C that catches some visitors out. Regulars recommend layers for exactly that reason, plus a rain jacket just in case, and flag the first week of May (Golden Week) as considerably busier than the rest of the month.
Add your own note from Karuizawa's card on the map.
Karuizawa climate normals — October
| Daytime high | 15°C / 59°F | 🙂 cool |
|---|---|---|
| Nighttime low | 5°C / 41°F | |
| Feels like (high) | 14°C / 57°F | |
| Rainfall | 180 mm / 7.1 in | ⛈ soaked |
| Rainy days | 14 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 8°C / 47°F | |
| Sunshine | 7.1 h/day | |
| Daylight | 11.3 h | |
| Wind | 9 km/h / 6 mph | |
| Snowfall | 0.1 cm / 0 in | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Karuizawa in October
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 3 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Karuizawa's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherKaruizawa's best weather comes in May, June and September — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Karuizawa in October
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Autumn colour
15 Oct – 10 Nov · usuallyThe larch avenues and Kumoba pond turn from the end of October. The town is at its best and the day-trippers thin out after the first hard frost.
Nearby, and something's on
Within 300 km of Karuizawa — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Karuizawa?
Karuizawa in October — FAQ
- Is October a good time to visit Karuizawa?
- October in Karuizawa: cool, soaked, with clean air — fine if you can take 14 rainy days. It ranks #8 of 12 months for Karuizawa on SeasonMap's comfort score (66/100).
- What is the weather like in Karuizawa in October?
- In October, Karuizawa averages a daily high of 15.2°C and a low of 5.2°C, with about 180.2 mm of rain over roughly 14.4 rainy days.
- What is the air quality in Karuizawa in October?
- Karuizawa has a mean US Air Quality Index of about 35 in October.
Other months in Karuizawa
Compare Karuizawa in October
Warmer or cooler than Karuizawa in October
Similar destinations in East Asia — October
Within 300 km: Matsumoto's Kamikochi open season around 17 Apr – 15 Nov, and Nozawa Onsen's Autumn colour around 10 Oct – 5 Nov.