Joliet Weather Year-Round — Best Time to Visit
Joliet, United States has mild weather year-round. The best time to visit is September (score: 86/100). Annual average high: 15.3°C, total rainfall: 990mm.
When is the best time to visit Joliet?
86
September is the best month to visit Joliet with a travel score of 86/100 (Excellent).
Expect highs of 24.2°C, 8 rain days, and 9.8 hours of daily sunshine.
View September weather details →Travel Score by Month
40
Jan
49
Feb
57
Mar
65
Apr
75
May
82
Jun
83
Jul
83
Aug
86
Sep
70
Oct
57
Nov
45
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Joliet each month?
15.3°C
Avg High
6.2°C
Avg Low
990mm
Annual Rain
How much rain does Joliet get?
Joliet receives 990mm of rain annually. The wettest month is typically May with 118mm, while February is the driest.
What is the weather like each month in Joliet?
January
40
0°C
Low: -8°C
9 rain days
Mixed
February
49
2°C
Low: -7°C
7 rain days
Mixed
March
57
9°C
Low: -1°C
10 rain days
Mixed
April
65
15°C
Low: 5°C
12 rain days
Good
May
75
21°C
Low: 11°C
12 rain days
Good
June
82
27°C
Low: 17°C
11 rain days
Excellent
July
83
28°C
Low: 19°C
11 rain days
Excellent
August
83
28°C
Low: 18°C
10 rain days
Excellent
September
Best time to visit86
24°C
Low: 15°C
8 rain days
Excellent
October
70
17°C
Low: 8°C
9 rain days
Good
November
57
9°C
Low: 2°C
8 rain days
Mixed
December
45
3°C
Low: -4°C
8 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31