Annual mean 9°C · wettest around December · prevailing wind SW
Warmest
26.2 °C
Coldest
-3.4 °C
Wettest
40%
Windiest
5.6 m/s
Prevailing
SW
4.4 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 Iwamizawa over the whole year is 9°C. August is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -7°C. The rainy (wet) season in Iwamizawa runs from October to February, peaking in December with a 32% chance of rain on a given day. The dry season is March to September; May is the driest month, at 13%. Winds in Iwamizawa are highest in April, averaging 4.1 m/s (15 km/h), and lightest in January, at 3.3 m/s (12 km/h). The prevailing wind is from the SW. The clearest skies in Iwamizawa come in April, when the sky is typically 67% covered; December is the cloudiest month, at 75%.
Month by month Iwamizawa 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
-3°C
-7°C
-8°C
28%
73%
3.3 m/s
0
0
0
February
-2°C
-7°C
-7°C
27%
74%
3.4 m/s
0
0
0
March
4°C
-2°C
-2°C
16%
69%
3.7 m/s
0
0
5
April
11°C
4°C
5°C
14%
67%
4.1 m/s
5
0
38
May
17°C
10°C
13°C
13%
69%
4.0 m/s
38
2
73
June
20°C
15°C
18°C
16%
74%
3.8 m/s
66
12
70
July
25°C
20°C
25°C
13%
73%
3.5 m/s
62
43
33
August
25°C
20°C
26°C
19%
74%
3.4 m/s
59
45
28
September
22°C
15°C
20°C
15%
68%
3.3 m/s
78
17
64
October
15°C
8°C
11°C
23%
68%
3.3 m/s
27
0
69
November
7°C
3°C
2°C
29%
74%
3.6 m/s
1
0
24
December
-1°C
-4°C
-6°C
32%
75%
3.5 m/s
0
0
2
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 Iwamizawa weather by season
Year round, Iwamizawa has days of about -3°C at their warmest in January, its coolest month, and 25°C in August, its warmest; the coolest hours of the day run from -7°C to 20°C through the year, and the average temperature over the year is 9°C around the clock. Rain is most likely around December and least likely around May. 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.
Iwamizawa weather in winterDecember to February
High -2°CLow -6°CRain 29%
Winter in Iwamizawa has typical daily highs of about -2°C and lows of about -6°C, with a 29% chance of rain on a given day.
Iwamizawa weather in springMarch to May
High 10°CLow 4°CRain 14%
Spring in Iwamizawa has typical daily highs of about 10°C and lows of about 4°C, with a 14% chance of rain on a given day.
Iwamizawa weather in summerJune to August
High 23°CLow 18°CRain 16%
Summer in Iwamizawa has typical daily highs of about 23°C and lows of about 18°C, with a 16% chance of rain on a given day.
Iwamizawa weather in autumnSeptember to November
High 14°CLow 9°CRain 22%
Autumn in Iwamizawa has typical daily highs of about 14°C and lows of about 9°C, with a 22% chance of rain on a given day.
When is the rainy season in Iwamizawa?
The rainy (wet) season in Iwamizawa runs from October to February, peaking in December with a 32% chance of rain on a given day. The dry season is March to September; May is the driest month, at 13%.
What time of year is Iwamizawa windiest?
Winds in Iwamizawa are highest in April, averaging 4.1 m/s (15 km/h), and lightest in January, at 3.3 m/s (12 km/h). The prevailing wind is from the SW.
What is the average temperature in Iwamizawa year round?
The average temperature in Iwamizawa over the whole year is 9°C. August is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -7°C.