Iruma Weather Year-Round — Best Time to Visit
Iruma, Japan has mild weather year-round. The best time to visit is May (score: 70/100). Annual average high: 18.2°C, total rainfall: 1795mm.
When is the best time to visit Iruma?
70
May is the best month to visit Iruma with a travel score of 70/100 (Good).
Expect highs of 21.6°C, 15 rain days, and 8.8 hours of daily sunshine.
View May weather details →Travel Score by Month
60
Jan
60
Feb
59
Mar
66
Apr
70
May
66
Jun
65
Jul
68
Aug
68
Sep
66
Oct
64
Nov
63
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Iruma each month?
18.2°C
Avg High
9.9°C
Avg Low
1795mm
Annual Rain
How much rain does Iruma get?
Iruma receives 1795mm of rain annually. The wettest month is typically September with 233mm, while December is the driest.
What is the weather like each month in Iruma?
January
60
7°C
Low: -2°C
7 rain days
Good
February
60
8°C
Low: -1°C
8 rain days
Good
March
59
12°C
Low: 2°C
13 rain days
Mixed
April
66
17°C
Low: 7°C
13 rain days
Good
May
Best time to visit70
22°C
Low: 13°C
15 rain days
Good
June
66
24°C
Low: 17°C
18 rain days
Good
July
65
28°C
Low: 21°C
20 rain days
Good
August
68
29°C
Low: 23°C
19 rain days
Good
September
68
25°C
Low: 19°C
16 rain days
Good
October
66
20°C
Low: 13°C
14 rain days
Good
November
64
15°C
Low: 7°C
10 rain days
Good
December
63
10°C
Low: 1°C
7 rain days
Good
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Data based on 1994–2024 averages · Last updated: 2024-12-31