Sioux City Weather Year-Round — Best Time to Visit
Sioux City, United States has cool weather year-round. The best time to visit is September (score: 87/100). Annual average high: 14.8°C, total rainfall: 766mm.
When is the best time to visit Sioux City?
87
September is the best month to visit Sioux City with a travel score of 87/100 (Excellent).
Expect highs of 24.4°C, 7 rain days, and 10.3 hours of daily sunshine.
View September weather details →Travel Score by Month
46
Jan
50
Feb
60
Mar
68
Apr
75
May
82
Jun
86
Jul
85
Aug
87
Sep
72
Oct
61
Nov
47
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Sioux City each month?
14.8°C
Avg High
4.9°C
Avg Low
766mm
Annual Rain
How much rain does Sioux City get?
Sioux City receives 766mm of rain annually. The wettest month is typically May with 116mm, while January is the driest.
What is the weather like each month in Sioux City?
January
46
-2°C
Low: -11°C
5 rain days
Mixed
February
50
1°C
Low: -9°C
5 rain days
Mixed
March
60
8°C
Low: -2°C
7 rain days
Good
April
68
15°C
Low: 4°C
10 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
86
29°C
Low: 19°C
8 rain days
Excellent
August
85
28°C
Low: 18°C
8 rain days
Excellent
September
Best time to visit87
24°C
Low: 14°C
7 rain days
Excellent
October
72
17°C
Low: 7°C
7 rain days
Good
November
61
8°C
Low: -1°C
5 rain days
Good
December
47
1°C
Low: -8°C
5 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31