Karuizawa Weather in January
January in Karuizawa brings low temperatures, with daytime highs of 4°C (39°F) and nights around -5°C (23°F). Quite a bit of snow/rainfall is expected, around 74 mm (2.9 in), so pack an umbrella.
Rainfall in Karuizawa in January
Historically, the month has about 18 days of snow/rain, averaging 74 mm (2.9 in) in total. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Karuizawa in January
If you're visiting Karuizawa in January, expect highs of 4°C (39°F) and overnight lows around -5°C (23°F). January is part of the winter season. Cold conditions tend to persist from morning through evening, so be prepared for winter weather. With overnight lows of -5°C (23°F), temperatures fall below freezing at night. An extra thick blanket can make a real difference if your accommodation runs cold. Being the coldest month of the year, it's a good idea to bring your heaviest winter gear.
Sunshine in Karuizawa in January
The area enjoys a moderate level of sunlight, with around 128 hours. It's a good balance between sunny and cloudy days.If you prefer dry days with pleasant temperatures, January may not be the ideal month to visit Karuizawa. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 January
Min Temperature
-5°C (23°F)
Max Temperature
4°C (39°F)
Chance of Rain
60%
Precipitation
74 mm (2.9 in)
Rainy days
18 days
Humidity
78% *
Sunshine
128 hours *
Percentage Sunshine
*
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in Karuizawa typically stay consistent throughout January, with daily highs averaging around 4°C (39°F). Nights are very cold, with lows typically ranging from -7°C (19°F) to -5°C (23°F).
Average temperatures in January
Daily Historical Precipitation
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Karuizawa in January
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 January
Our historical data for Karuizawa spans 1976 to 2025, revealing these weather extremes.
- The hottest January day on record in Karuizawa reached 14°C (57°F) (January 15, 1978).
- On January 10, 1999, Karuizawa saw its coldest January day with temperatures maxing out at -8°C (18°F).
- Nighttime temperatures dropped to -16°C (3°F) on January 14, 2001, marking the coldest January night on record.
- Peak precipitation in January occurred on January 18, 2016, when 38 mm (1.5 in) of precipitation was measured.
Best Places in Japan in January
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in January →
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What to Wear in Karuizawa in January
Dress warmly and in layers for your trip to Karuizawa in January. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Wet weather is likely, so pack waterproof gear for multiple rainy days. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Karuizawa in January
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.
