Osan Weather Year-Round — Best Time to Visit
Osan, South Korea has mild weather year-round. The best time to visit is June (score: 85/100). Annual average high: 16.8°C, total rainfall: 1140mm.
When is the best time to visit Osan?
85
June is the best month to visit Osan with a travel score of 85/100 (Excellent).
Expect highs of 26.8°C, 8 rain days, and 9.8 hours of daily sunshine.
View June weather details →Travel Score by Month
60
Jan
64
Feb
68
Mar
76
Apr
83
May
85
Jun
70
Jul
73
Aug
82
Sep
79
Oct
65
Nov
60
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Osan each month?
16.8°C
Avg High
7.8°C
Avg Low
1140mm
Annual Rain
How much rain does Osan get?
Osan receives 1140mm of rain annually. The wettest month is typically July with 280mm, while January is the driest.
What is the weather like each month in Osan?
January
60
2°C
Low: -6°C
4 rain days
Mixed
February
64
5°C
Low: -4°C
4 rain days
Good
March
68
11°C
Low: 0°C
6 rain days
Good
April
76
17°C
Low: 6°C
7 rain days
Good
May
83
23°C
Low: 12°C
7 rain days
Excellent
June
Best time to visit85
27°C
Low: 17°C
8 rain days
Excellent
July
70
29°C
Low: 22°C
15 rain days
Good
August
73
29°C
Low: 22°C
14 rain days
Good
September
82
25°C
Low: 17°C
8 rain days
Excellent
October
79
19°C
Low: 10°C
5 rain days
Good
November
65
12°C
Low: 3°C
7 rain days
Good
December
60
4°C
Low: -4°C
4 rain days
Good
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Data based on 1994–2024 averages · Last updated: 2024-12-31