Climate · Japan

Karuizawa

Warm and wet from June to September; chilly and damp from December to March.

Typical weather, averaged over 30 years36.3°N900 m above the sea
  1. Jan38°3°21°-6°Rain on about two days a week.
  2. Feb39°4°20°-7°Rain on about two days a week.
  3. Mar47°8°27°-3°Rain on about three days a week.
  4. Apr58°14°37°3°Rain on about three days a week.
  5. May68°20°47°8°Rain on about four days a week.
  6. Jun73°23°56°13°Rain on about five days a week.
  7. Jul80°27°63°17°Rain on about six days a week.
  8. Aug82°28°65°18°Rain on about six days a week.
  9. Sep75°24°60°16°Rain on about five days a week.
  10. Oct66°19°49°9°Rain on about four days a week.
  11. Nov55°13°37°3°Rain on about two days a week.
  12. Dec44°7°27°-3°Rain on about two days a week.
Each month: its typical high and low, and dots for wet days a week. Tap a month to open it.The best months

The warm season runs from June to September, with highs near 77°F and nights near 61°F. From December to March, highs are nearer 42°F. The rain comes from June to September, on about five days a week. November to February is the driest stretch, with rain or snow on about two days a week. Daylight runs from about 9½ hours in December to 14½ hours in June.The warm season runs from June to September, with highs near 25°C and nights near 16°C. From December to March, highs are nearer 6°C. The rain comes from June to September, on about five days a week. November to February is the driest stretch, with rain or snow on about two days a week. Daylight runs from about 9½ hours in December to 14½ hours in June.

Where Karuizawa sits

Asia/Tokyo

this place
typical high in Januarytypical high in Februarytypical high in Marchtypical high in Apriltypical high in Maytypical high in Junetypical high in Julytypical high in Augusttypical high in Septembertypical high in Octobertypical high in Novembertypical high in December 40°F4°C95°F35°C
Latitude
36.3°Nnorthern hemisphere
Above the sea
900 mupland
Sunrise, mid-JanuarySunrise, mid-FebruarySunrise, mid-MarchSunrise, mid-AprilSunrise, mid-MaySunrise, mid-JuneSunrise, mid-JulySunrise, mid-AugustSunrise, mid-SeptemberSunrise, mid-OctoberSunrise, mid-NovemberSunrise, mid-December
6:56 AM6:35 AM5:58 AM5:13 AM4:40 AM4:27 AM4:39 AM5:03 AM5:27 AM5:51 AM6:22 AM6:50 AMsets 4:52 PMsets 5:25 PMsets 5:52 PMsets 6:18 PMsets 6:44 PMsets 7:04 PMsets 7:04 PMsets 6:38 PMsets 5:55 PMsets 5:11 PMsets 4:39 PMsets 4:32 PM
Nearest of ours
Nozawa Onsen65 km north

The land around Karuizawa, shaded by its typical high in January, the planning map's own layer.The land around Karuizawa, shaded by its typical high in February, the planning map's own layer.The land around Karuizawa, shaded by its typical high in March, the planning map's own layer.The land around Karuizawa, shaded by its typical high in April, the planning map's own layer.The land around Karuizawa, shaded by its typical high in May, the planning map's own layer.The land around Karuizawa, shaded by its typical high in June, the planning map's own layer.The land around Karuizawa, shaded by its typical high in July, the planning map's own layer.The land around Karuizawa, shaded by its typical high in August, the planning map's own layer.The land around Karuizawa, shaded by its typical high in September, the planning map's own layer.The land around Karuizawa, shaded by its typical high in October, the planning map's own layer.The land around Karuizawa, shaded by its typical high in November, the planning map's own layer.The land around Karuizawa, shaded by its typical high in December, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Through the year

week by week

Temperature

Highs from 38°F in January to 82°F in August.Highs from 3°C in January to 28°C in August.

Chance of a wet day

Wettest in July (80% of days), driest in December (29%).

Cloud cover

Clearest in November and December (56% cover), cloudiest in July (73%).

Daylight

From 9h 43m in December to 14h 36m in June.

Week by week, lightly smoothed. Shading marks the seasons; the olive line, the best months. Hover or tap a week for its figures.

Month by month

°F°C

Karuizawa, month by month: the typical high and low, wet days a week, cloud cover and daylight.
MonthTypical low to highWet days a weekCloudDaylight
JanuaryCool season
21°-6°38°3°
2 days60%9h 59m
FebruaryCool season
20°-7°39°4°
2 days61%10h 48m
MarchCool season
27°-3°47°8°
3 days59%11h 54m
April
37°3°58°14°
3 days59%13h 05m
May
47°8°68°20°
4 days62%14h 05m
JuneWarm seasonAt its best
56°13°73°23°
5 days72%14h 36m
JulyWarm seasonAt its best
63°17°80°27°
6 days73%14h 21m
AugustWarm seasonAt its best
65°18°82°28°
6 days65%13h 29m
SeptemberWarm seasonAt its best
60°16°75°24°
5 days64%12h 20m
October
49°9°66°19°
4 days60%11h 10m
November
37°3°55°13°
2 days56%10h 11m
DecemberCool season
27°-3°44°7°
2 days56%9h 43m

When is the best time to visit Karuizawa?


The best months are June to September: highs near 77°F, nights near 61°F, and rain on about five days a week.The best months are June to September: highs near 25°C, nights near 16°C, and rain on about five days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

Questions


What is the warmest month in Karuizawa?

August, with highs near 82°F and lows near 65°F. The coolest is January, with highs near 38°F.August, with highs near 28°C and lows near 18°C. The coolest is January, with highs near 3°C.

When does it rain most in Karuizawa?

July, with rain on about six days a week. December is the driest, with rain on about two days a week.

How long are the days in Karuizawa?

From about 9½ hours in December to 14½ hours in June.

When are the skies clearest in Karuizawa?

November and December, when cloud covers about 56% of the sky on average. July is the cloudiest, at about 73%.

Places with a year like Karuizawa's

by their highs, lows and wet days

Their highs, lows, wet days and cloud run closest to Karuizawa's through the year, one place a country. “Six months apart”: their winter is Karuizawa's summer.

Elsewhere in Japan

All of Japan

Where to stay

1 in our collection

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Karuizawa. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.