SeasonMapKaruizawa weather in April
Japan
April in Karuizawa: cool, rainy — a great time to visit.
#5 of 12 months in Karuizawa · #951 of 1383 destinations to visit in April · comfort 73/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Karuizawa in April
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 — April
| Daytime high | 14°C / 58°F | 🙂 cool |
|---|---|---|
| Nighttime low | 0°C / 33°F | |
| Feels like (high) | 12°C / 54°F | |
| Rainfall | 110 mm / 4.3 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 2°C / 36°F | |
| Sunshine | 9.4 h/day | |
| Daylight | 13.1 h | |
| Wind | 12 km/h / 8 mph | |
| Snowfall | 7.7 cm / 3 in | |
| Air quality (US AQI) | 56 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Karuizawa in April
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.
BusySpring break (haruyasumi) in Japan, school holidays in 2 of the markets that fill it(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
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 April — FAQ
- Is April a good time to visit Karuizawa?
- April in Karuizawa: cool, rainy — a great time to visit. It ranks #5 of 12 months for Karuizawa on SeasonMap's comfort score (73/100).
- What is the weather like in Karuizawa in April?
- In April, Karuizawa averages a daily high of 14.2°C and a low of 0.4°C, with about 109.9 mm of rain over roughly 12.5 rainy days.
- What is the air quality in Karuizawa in April?
- Karuizawa has a mean US Air Quality Index of about 56 in April.
- Does it snow in Karuizawa in April?
- Karuizawa sees roughly 7.7 cm of snowfall in April.
Other months in Karuizawa
Compare Karuizawa in April
Warmer or cooler than Karuizawa in April
Similar destinations in East Asia — April
Within 300 km: Matsumoto's Cherry blossom around 5–20 Apr, and Fujikawaguchiko's Fuji Shibazakura Festival around 11 Apr – 25 May.