Karuizawa Weather in April
April in Karuizawa brings moderate temperatures, with daytime highs of 15°C (59°F) and nights around 4°C (39°F). Quite a bit of rainfall is expected, around 122 mm (4.8 in), so pack an umbrella.
Rainfall in Karuizawa in April
On average, there are about 16 days with rain during this month, averaging 122 mm (4.8 in). This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Karuizawa in April
April in Karuizawa brings typical temperatures with highs around 15°C (59°F) and lows of 4°C (39°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights fall to 4°C (39°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Karuizawa in April
The days are predominantly sunny, with an estimated total of around 198 hours of sunshine. Despite the cool temperatures, these sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May typically offers the best weather for Karuizawa.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Karuizawa's climate page.
Karuizawa Temperature in April
Min Temperature
4°C (39°F)
Max Temperature
15°C (59°F)
Chance of Rain
54%
Precipitation
122 mm (4.8 in)
Rainy days
16 days
Humidity
61% *
Sunshine
198 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Karuizawa typically rise from around 12°C (54°F) at the start of April to approximately 18°C (64°F) by the end. Nights are cold, with lows typically ranging from 0°C (32°F) to 6°C (43°F).
Average temperatures in April
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in April
Historical weather for Karuizawa in April
Browse day-by-day weather records for Karuizawa spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Karuizawa historical weather extremes in April
Based on weather observations in Karuizawa between 1976 and 2026, these are the recorded extremes during April.
- Karuizawa recorded its highest April temperature of 28°C (82°F) on April 29, 2005.
- Karuizawa registered its coldest April night on April 4, 1996, with temperatures dropping to -9°C (16°F).
- Peak precipitation in April occurred on April 8, 2008, when 68 mm (2.7 in) of precipitation was measured.
Best Places in Japan in April
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in April →
perfect weather
pleasant
tolerable
unpleasant
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What to Wear in Karuizawa in April
The weather can be unpredictable in April, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Karuizawa in April
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Karuizawa's climate page.
Temperature Rainfall Sunshine Humidity
See the full Karuizawa climate overview or explore weather in Japan.
