Saint Charles Weather Year-Round — Best Time to Visit
Saint Charles, United States has mild weather year-round. The best time to visit is September (score: 89/100). Annual average high: 18.4°C, total rainfall: 1062mm.
When is the best time to visit Saint Charles?
89
September is the best month to visit Saint Charles with a travel score of 89/100 (Excellent).
Expect highs of 26.2°C, 7 rain days, and 10.2 hours of daily sunshine.
View September weather details →Travel Score by Month
51
Jan
57
Feb
63
Mar
73
Apr
79
May
84
Jun
84
Jul
86
Aug
89
Sep
77
Oct
64
Nov
53
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Saint Charles each month?
18.4°C
Avg High
9°C
Avg Low
1062mm
Annual Rain
How much rain does Saint Charles get?
Saint Charles receives 1062mm of rain annually. The wettest month is typically May with 124mm, while February is the driest.
What is the weather like each month in Saint Charles?
January
51
4°C
Low: -4°C
8 rain days
Mixed
February
57
7°C
Low: -3°C
8 rain days
Mixed
March
63
13°C
Low: 3°C
10 rain days
Good
April
73
19°C
Low: 8°C
11 rain days
Good
May
79
24°C
Low: 14°C
13 rain days
Good
June
84
29°C
Low: 19°C
10 rain days
Excellent
July
84
31°C
Low: 21°C
10 rain days
Excellent
August
86
30°C
Low: 21°C
9 rain days
Excellent
September
Best time to visit89
26°C
Low: 17°C
7 rain days
Excellent
October
77
20°C
Low: 10°C
8 rain days
Good
November
64
12°C
Low: 4°C
7 rain days
Good
December
53
6°C
Low: -2°C
8 rain days
Mixed
Compare Saint Charles
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What cities are near Saint Charles?
Data based on 1994–2024 averages · Last updated: 2024-12-31