Castro Valley Weather Year-Round — Best Time to Visit
Castro Valley, United States has mild weather year-round. The best time to visit is September (score: 96/100). Annual average high: 19.7°C, total rainfall: 506mm.
When is the best time to visit Castro Valley?
96
September is the best month to visit Castro Valley with a travel score of 96/100 (Excellent).
Expect highs of 25.3°C, 1 rain days, and 11.7 hours of daily sunshine.
View September weather details →Travel Score by Month
62
Jan
67
Feb
73
Mar
80
Apr
86
May
93
Jun
95
Jul
95
Aug
96
Sep
90
Oct
74
Nov
62
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Castro Valley each month?
19.7°C
Avg High
10.1°C
Avg Low
506mm
Annual Rain
How much rain does Castro Valley get?
Castro Valley receives 506mm of rain annually. The wettest month is typically January with 100mm, while July is the driest.
What is the weather like each month in Castro Valley?
January
62
14°C
Low: 6°C
9 rain days
Good
February
67
15°C
Low: 6°C
8 rain days
Good
March
73
16°C
Low: 8°C
8 rain days
Good
April
80
18°C
Low: 9°C
5 rain days
Good
May
86
21°C
Low: 11°C
3 rain days
Excellent
June
93
24°C
Low: 12°C
1 rain days
Excellent
July
95
25°C
Low: 14°C
0 rain days
Excellent
August
95
25°C
Low: 14°C
0 rain days
Excellent
September
Best time to visit96
25°C
Low: 14°C
1 rain days
Excellent
October
90
23°C
Low: 12°C
3 rain days
Excellent
November
74
17°C
Low: 9°C
6 rain days
Good
December
62
14°C
Low: 6°C
9 rain days
Good
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What cities are near Castro Valley?
Data based on 1994–2024 averages · Last updated: 2024-12-31