Rockville Weather Year-Round — Best Time to Visit
Rockville, United States has mild weather year-round. The best time to visit is September (score: 83/100). Annual average high: 17.9°C, total rainfall: 1109mm.
When is the best time to visit Rockville?
83
September is the best month to visit Rockville with a travel score of 83/100 (Excellent).
Expect highs of 25.2°C, 9 rain days, and 9.1 hours of daily sunshine.
View September weather details →Travel Score by Month
53
Jan
57
Feb
64
Mar
73
Apr
79
May
83
Jun
82
Jul
83
Aug
83
Sep
75
Oct
66
Nov
55
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Rockville each month?
17.9°C
Avg High
8.6°C
Avg Low
1109mm
Annual Rain
How much rain does Rockville get?
Rockville receives 1109mm of rain annually. The wettest month is typically September with 118mm, while November is the driest.
What is the weather like each month in Rockville?
January
53
5°C
Low: -3°C
8 rain days
Mixed
February
57
7°C
Low: -2°C
8 rain days
Mixed
March
64
12°C
Low: 2°C
9 rain days
Good
April
73
18°C
Low: 7°C
10 rain days
Good
May
79
23°C
Low: 12°C
11 rain days
Good
June
83
28°C
Low: 18°C
11 rain days
Excellent
July
82
30°C
Low: 20°C
12 rain days
Excellent
August
83
29°C
Low: 20°C
11 rain days
Excellent
September
Best time to visit83
25°C
Low: 16°C
9 rain days
Excellent
October
75
19°C
Low: 10°C
7 rain days
Good
November
66
12°C
Low: 4°C
7 rain days
Good
December
55
7°C
Low: 0°C
8 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31