Weather in Castro Valley in May
Castro Valley, United States averages a high of 20.6°C (69.1°F) and low of 10.6°C (51.1°F) in May, with 3 rain days and 12.8 hours of daily sunshine. Travel score: 85.5/100 (Excellent). The best time to visit Castro Valley is September.
High
21°C69°F
Low
11°C51°F
🌧️
3
rain days
☀️
12.8
hrs/day sunshine
💧
71%
humidity
86— Excellent
May in Castro Valley is mild and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Castro Valley?
How much does it rain in Castro Valley in May?
Castro Valley receives an average of 19.5mm of rainfall across 3 rainy days in May. The annual total is 505.6mm.
What should I pack for Castro Valley in May?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 21°C
🧴
Sunscreen SPF 30+
13 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in May?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31