Annual mean 12°C · wettest around July · prevailing wind S
Warmest
29.2 °C
Coldest
3.2 °C
Wettest
34%
Windiest
3.6 m/s
Prevailing
S
2.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Karuizawa over the whole year is 12°C. August is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C. The rainy (wet) season in Karuizawa runs from May to October, peaking in July with a 24% chance of rain on a given day. The dry season is November to April; December is the driest month, at 6%. Winds in Karuizawa are highest in February, averaging 2.7 m/s (10 km/h), and lightest in July, at 2.0 m/s (7 km/h). The prevailing wind is from the S. The clearest skies in Karuizawa come in January, when the sky is typically 49% covered; September is the cloudiest month, at 79%.
Month by month Karuizawa climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
4°C
-3°C
-1°C
7%
49%
2.5 m/s
0
0
9
February
5°C
-2°C
-0°C
8%
54%
2.7 m/s
1
0
14
March
9°C
2°C
5°C
13%
58%
2.7 m/s
7
0
40
April
15°C
7°C
11°C
15%
65%
2.7 m/s
32
1
69
May
20°C
12°C
18°C
16%
68%
2.4 m/s
67
10
72
June
23°C
17°C
23°C
21%
75%
2.2 m/s
68
32
45
July
27°C
21°C
29°C
24%
76%
2.0 m/s
32
51
11
August
28°C
22°C
30°C
19%
74%
2.1 m/s
25
53
7
September
23°C
18°C
24°C
21%
79%
2.0 m/s
59
39
36
October
17°C
11°C
16°C
17%
70%
2.0 m/s
53
8
73
November
12°C
5°C
9°C
8%
56%
2.2 m/s
18
0
65
December
6°C
-0°C
2°C
6%
50%
2.4 m/s
1
0
23
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Karuizawa weather by season
Year round, Karuizawa has days of about 4°C at their warmest in January, its coolest month, and 28°C in August, its warmest; the coolest hours of the day run from -3°C to 22°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around July and least likely around December. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Karuizawa weather in winterDecember to February
High 5°CLow -2°CRain 7%
Winter in Karuizawa has typical daily highs of about 5°C and lows of about -2°C, with a 7% chance of rain on a given day.
Karuizawa weather in springMarch to May
High 15°CLow 7°CRain 15%
Spring in Karuizawa has typical daily highs of about 15°C and lows of about 7°C, with a 15% chance of rain on a given day.
Karuizawa weather in summerJune to August
High 26°CLow 20°CRain 22%
Summer in Karuizawa has typical daily highs of about 26°C and lows of about 20°C, with a 22% chance of rain on a given day.
Karuizawa weather in autumnSeptember to November
High 18°CLow 11°CRain 15%
Autumn in Karuizawa has typical daily highs of about 18°C and lows of about 11°C, with a 15% chance of rain on a given day.
When is the rainy season in Karuizawa?
The rainy (wet) season in Karuizawa runs from May to October, peaking in July with a 24% chance of rain on a given day. The dry season is November to April; December is the driest month, at 6%.
What time of year is Karuizawa windiest?
Winds in Karuizawa are highest in February, averaging 2.7 m/s (10 km/h), and lightest in July, at 2.0 m/s (7 km/h). The prevailing wind is from the S.
What is the average temperature in Karuizawa year round?
The average temperature in Karuizawa over the whole year is 12°C. August is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C.