Weather in San Ramon in September
San Ramon, United States averages a high of 26.9°C (80.4°F) and low of 13.7°C (56.7°F) in September, with 1 rain days and 11.6 hours of daily sunshine. Travel score: 96.9/100 (Excellent). The best time to visit San Ramon is July.
High
27°C80°F
Low
14°C57°F
🌧️
1
rain days
☀️
11.6
hrs/day sunshine
💧
67%
humidity
97— Excellent
September in San Ramon is warm and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in San Ramon?
How much does it rain in San Ramon in September?
San Ramon receives an average of 3.4mm of rainfall across 1 rainy days in September. The annual total is 500.1mm.
What should I pack for San Ramon in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 27°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Evening jacket or cardigan
Temperature drops 13°C from day to night
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