Weather in San Mateo in September
San Mateo, United States averages a high of 23.8°C (74.8°F) and low of 14.3°C (57.7°F) in September, with 1 rain days and 11.7 hours of daily sunshine. Travel score: 93.6/100 (Excellent). The best time to visit San Mateo is September.
High
24°C75°F
Low
14°C58°F
🌧️
1
rain days
☀️
11.7
hrs/day sunshine
💧
74%
humidity
94— Excellent
September in San Mateo is warm and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in San Mateo?
How much does it rain in San Mateo in September?
San Mateo receives an average of 2.8mm of rainfall across 1 rainy days in September. The annual total is 510.8mm.
What should I pack for San Mateo in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 24°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in September?
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