Waterloo Weather Year-Round — Best Time to Visit
Waterloo, United States has cool weather year-round. The best time to visit is September (score: 84/100). Annual average high: 14°C, total rainfall: 904mm.
When is the best time to visit Waterloo?
84
September is the best month to visit Waterloo with a travel score of 84/100 (Excellent).
Expect highs of 23.5°C, 7 rain days, and 10 hours of daily sunshine.
View September weather details →Travel Score by Month
41
Jan
46
Feb
57
Mar
66
Apr
74
May
80
Jun
83
Jul
83
Aug
84
Sep
69
Oct
57
Nov
43
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Waterloo each month?
14°C
Avg High
4.7°C
Avg Low
904mm
Annual Rain
How much rain does Waterloo get?
Waterloo receives 904mm of rain annually. The wettest month is typically June with 125mm, while February is the driest.
What is the weather like each month in Waterloo?
January
41
-3°C
Low: -12°C
6 rain days
Mixed
February
46
0°C
Low: -10°C
6 rain days
Mixed
March
57
8°C
Low: -3°C
8 rain days
Mixed
April
66
15°C
Low: 4°C
10 rain days
Good
May
74
21°C
Low: 11°C
12 rain days
Good
June
80
26°C
Low: 17°C
12 rain days
Excellent
July
83
28°C
Low: 19°C
9 rain days
Excellent
August
83
27°C
Low: 18°C
9 rain days
Excellent
September
Best time to visit84
24°C
Low: 14°C
7 rain days
Excellent
October
69
16°C
Low: 7°C
8 rain days
Good
November
57
8°C
Low: 0°C
7 rain days
Mixed
December
43
0°C
Low: -7°C
7 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31