Weather · September
San Ramon weather in September
Average highs of 85°F, lows of 55°F and 0.10 in of rain, from 30 years of weather records.
September is San Ramon’s 3rd warmest month, with average highs of 85°F and lows of 55°F. That is 2° cooler than August, and 13° above the yearly average high.
- Average high
- 85°F
- Average low
- 55°F
- Precipitation
- 0.10 in
- Wet days
- 1
- Sunrise · sunset
- 6:49 AM · 7:16 PM
What to wear in September
- Warm days: shorts and T-shirts, with a light layer for cooler evenings.
What September weather is good for
What’s on in San Ramon in September
Guides for this month: Halloween in San Ramon.
See all upcoming events and school days off.
September compared with the months around it
Planning a trip? See the best time to visit San Ramon and today’s forecast.
Questions
How hot does it get in San Ramon in September?
Average highs are 85°F and average lows 55°F, for a daily mean of 70°F. Individual days run hotter or colder than these 30-year averages.
Does it rain in San Ramon in September?
September averages 0.10 in of precipitation over about 1 days with at least 0.01 in. It is the 11th wettest month of the year.
What time is sunset in San Ramon in September?
Around mid-September the sun rises about 6:49 AM and sets about 7:16 PM, for roughly 12.5 hours of daylight.
Is September a good time to visit San Ramon?
The mildest months for visiting are May, June, October. September is warm, with Halloween events.
NOAA U.S. Climate Normals 1991–2020, Livermore Muni Ap station (7.9 mi from downtown). Sunrise and sunset are calculated for September 15 at the city’s coordinates.