Longmont Weather Year-Round — Best Time to Visit
Longmont, United States has mild weather year-round. The best time to visit is August (score: 92/100). Annual average high: 16.4°C, total rainfall: 473mm.
When is the best time to visit Longmont?
92
August is the best month to visit Longmont with a travel score of 92/100 (Excellent).
Expect highs of 28.8°C, 6 rain days, and 12.4 hours of daily sunshine.
View August weather details →Travel Score by Month
59
Jan
61
Feb
68
Mar
72
Apr
76
May
89
Jun
92
Jul
92
Aug
90
Sep
78
Oct
67
Nov
59
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Longmont each month?
16.4°C
Avg High
2.4°C
Avg Low
473mm
Annual Rain
How much rain does Longmont get?
Longmont receives 473mm of rain annually. The wettest month is typically May with 86mm, while December is the driest.
What is the weather like each month in Longmont?
January
59
4°C
Low: -8°C
5 rain days
Mixed
February
61
5°C
Low: -8°C
5 rain days
Good
March
68
11°C
Low: -4°C
7 rain days
Good
April
72
15°C
Low: 0°C
9 rain days
Good
May
76
20°C
Low: 6°C
11 rain days
Good
June
89
27°C
Low: 12°C
8 rain days
Excellent
July
92
30°C
Low: 15°C
7 rain days
Excellent
August
Best time to visit92
29°C
Low: 15°C
6 rain days
Excellent
September
90
25°C
Low: 10°C
5 rain days
Excellent
October
78
17°C
Low: 3°C
6 rain days
Good
November
67
10°C
Low: -3°C
5 rain days
Good
December
59
5°C
Low: -8°C
4 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31