Annual mean 9°C · wettest around December · prevailing wind W
Warmest
25.8 °C
Coldest
-2.9 °C
Wettest
57%
Windiest
5.3 m/s
Prevailing
W
4.5 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 Iwanai over the whole year is 9°C. August is the hottest month, with highs of about 25°C; February is the coldest, with lows of about -5°C. The rainy (wet) season in Iwanai runs from November to February, peaking in December with a 48% chance of rain on a given day. The dry season is March to October; July is the driest month, at 14%. Winds in Iwanai are highest in May, averaging 3.8 m/s (14 km/h), and lightest in September, at 3.0 m/s (11 km/h). The prevailing wind is from the W. The clearest skies in Iwanai come in October, when the sky is typically 67% covered; December is the cloudiest month, at 75%.
Month by month Iwanai 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
-2°C
-5°C
-8°C
40%
74%
3.5 m/s
0
0
0
February
-1°C
-5°C
-7°C
37%
74%
3.6 m/s
0
0
1
March
4°C
-1°C
-2°C
20%
67%
3.6 m/s
0
0
6
April
10°C
4°C
5°C
18%
67%
3.7 m/s
4
0
36
May
16°C
10°C
12°C
15%
68%
3.8 m/s
34
1
73
June
19°C
14°C
17°C
18%
74%
3.6 m/s
65
8
74
July
24°C
19°C
24°C
14%
74%
3.4 m/s
68
42
38
August
25°C
20°C
25°C
20%
74%
3.2 m/s
62
47
30
September
22°C
15°C
20°C
16%
68%
3.0 m/s
80
17
65
October
15°C
9°C
11°C
25%
67%
3.2 m/s
28
1
68
November
7°C
3°C
2°C
35%
73%
3.5 m/s
1
0
24
December
-1°C
-3°C
-6°C
48%
75%
3.6 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 Iwanai weather by season
Year round, Iwanai has days of about -2°C at their warmest in January, its coolest month, and 25°C in August, its warmest; the coolest hours of the day run from -5°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 July. 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.
Iwanai weather in winterDecember to February
High -1°CLow -4°CRain 42%
Winter in Iwanai has typical daily highs of about -1°C and lows of about -4°C, with a 42% chance of rain on a given day.
Iwanai weather in springMarch to May
High 10°CLow 5°CRain 18%
Spring in Iwanai has typical daily highs of about 10°C and lows of about 5°C, with a 18% chance of rain on a given day.
Iwanai weather in summerJune to August
High 23°CLow 18°CRain 17%
Summer in Iwanai has typical daily highs of about 23°C and lows of about 18°C, with a 17% chance of rain on a given day.
Iwanai weather in autumnSeptember to November
High 14°CLow 9°CRain 25%
Autumn in Iwanai has typical daily highs of about 14°C and lows of about 9°C, with a 25% chance of rain on a given day.
When is the rainy season in Iwanai?
The rainy (wet) season in Iwanai runs from November to February, peaking in December with a 48% chance of rain on a given day. The dry season is March to October; July is the driest month, at 14%.
What time of year is Iwanai windiest?
Winds in Iwanai are highest in May, averaging 3.8 m/s (14 km/h), and lightest in September, at 3.0 m/s (11 km/h). The prevailing wind is from the W.
What is the average temperature in Iwanai year round?
The average temperature in Iwanai over the whole year is 9°C. August is the hottest month, with highs of about 25°C; February is the coldest, with lows of about -5°C.