Weather in Castro Valley in December
Castro Valley, United States averages a high of 13.6°C (56.5°F) and low of 6.2°C (43.2°F) in December, with 9 rain days and 7 hours of daily sunshine. Travel score: 62.2/100 (Good). The best time to visit Castro Valley is September.
High
14°C56°F
Low
6°C43°F
🌧️
9
rain days
☀️
7
hrs/day sunshine
💧
79%
humidity
62— Good
December in Castro Valley is cool and occasionally wet — good for most activities.
What are the average temperatures in Castro Valley?
How much does it rain in Castro Valley in December?
Castro Valley receives an average of 97.1mm of rainfall across 9 rainy days in December. The annual total is 505.6mm.
What should I pack for Castro Valley in December?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Warm coat
Cool weather with highs around 14°C
🧶
Sweaters and warm layers
Layer up for comfort
Traveling to United States in December?
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