SeasonMapKaruizawa weather in June
Japan
June in Karuizawa: nice, soaked, with muggy air — fine if you can take 20 rainy days.
#3 of 12 months in Karuizawa · #828 of 1383 destinations to visit in June · comfort 77/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Karuizawa in June
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 — June
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 52°F | |
| Feels like (high) | 22°C / 72°F | |
| Rainfall | 199 mm / 7.8 in | ⛈ soaked |
| Rainy days | 20 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 14°C / 58°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 14.6 h | |
| Wind | 9 km/h / 5 mph | |
| Air quality (US AQI) | 59 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Karuizawa in June
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.
Busyschool holidays in 3 of the markets that fill it, one of its best months for weather(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).
Best 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 June
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Tsuyu and the fog
10 Jun – 15 Jul · usuallyMonsoonAt a thousand metres the rainy season is cloud sitting in the larches rather than downpours. The shops are quiet and the moss is why people who know come now.
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 June — FAQ
- Is June a good time to visit Karuizawa?
- June in Karuizawa: nice, soaked, with muggy air — fine if you can take 20 rainy days. It ranks #3 of 12 months for Karuizawa on SeasonMap's comfort score (77/100).
- What is the weather like in Karuizawa in June?
- In June, Karuizawa averages a daily high of 21°C and a low of 11.2°C, with about 198.8 mm of rain over roughly 19.5 rainy days.
- What is the air quality in Karuizawa in June?
- Karuizawa has a mean US Air Quality Index of about 59 in June.
Other months in Karuizawa
Compare Karuizawa in June
Warmer or cooler than Karuizawa in June
Similar destinations in East Asia — June
Within 300 km: Matsumoto's Kamikochi open season around 17 Apr – 15 Nov, and Hakone's Hydrangea train around 15 Jun – 20 Jul.