Weather in San Mateo in December
San Mateo, United States averages a high of 13.6°C (56.5°F) and low of 7.5°C (45.5°F) in December, with 10 rain days and 7.1 hours of daily sunshine. Travel score: 62/100 (Good). The best time to visit San Mateo is September.
High
14°C56°F
Low
8°C46°F
🌧️
10
rain days
☀️
7.1
hrs/day sunshine
💧
82%
humidity
62— Good
December in San Mateo is cool and occasionally wet — good for most activities.
What are the average temperatures in San Mateo?
How much does it rain in San Mateo in December?
San Mateo receives an average of 101.6mm of rainfall across 10 rainy days in December. The annual total is 510.8mm.
What should I pack for San Mateo 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
🎉Visiting United States in December?
Don't miss any public holidays — check before you book!
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What is the weather like in other months in San Mateo?
Data based on 1994–2024 averages · Last updated: 2024-12-31