San Ramon (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit San Ramon.
Climate overview of San Ramon
San Ramon, California, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 30°C (86°F) in July, while winters cool to 14°C (57°F) in December.
San Ramon sees a moderate amount of rainfall, totalling around 517 mm (20 in) per year. It experiences a distinct dry season from May to October, with very warm summers and mild winters, creating some seasonal variation. The most sunshine falls in May, with an average of 10.8 hours of daily sunshine.
San Ramon Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Ramon - and find the best time to visit.
Monthly Temperature in San Ramon
Depending on the time of the year, temperatures range from very warm to moderate in San Ramon. Average maximum daytime temperatures range from a very warm 30°C (86°F) in July, the warmest time of the year, to a moderate 14°C (57°F) during cooler months like December.
At night, you can expect temperatures ranging from 13°C (55°F) in July to around 4°C (39°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in San Ramon
Generally, San Ramon has a moderate amount of precipitation, averaging 517 mm (20 in) of rainfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives high rainfall, averaging 111 mm (4.4 in) of precipitation, recorded across 13 rainy days. In contrast, the driest month August brings less rainfall, with 0.1 mm (0 in) over 0 rainy days. For more details, please visit our San Ramon Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in San Ramon
Seasonal changes in sunshine hours are quite dramatic in San Ramon. While May receives considerable daily sunshine with up to 10.8 hours, December marks the darkest time of the year, where sunshine is scarce with only 5.3 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in San Ramon by Month
The relative humidity is high throughout the year in San Ramon.
The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit San Ramon
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, June, September and October
- Warmest weather: July, August and September
- Most sunshine: April, May, June and July
- Fewest rainy days: June, July, August and September
- Wettest months: January, February, March, April, November and December, when rainfall is highest.
- Seasonal pattern: a distinct dry season from May to October, with very warm summers and mild winters
Frequently asked questions about the climate in San Ramon
What is the best time to visit San Ramon?
April, May, June, September and October typically offer the most optimal weather in San Ramon. In contrast, December tends to have less optimal conditions. San Ramon has a distinct dry season from May to October, with very warm summers and mild winters.
What temperatures can I expect in San Ramon?
Daytime highs range from 14°C (57°F) in December to 30°C (86°F) in July. Nighttime lows range from 4°C (39°F) to 13°C (55°F). Temperatures vary considerably through the year.
How much rain does San Ramon get?
Annual rainfall is around 517 mm (20 in). December is the wettest month with 111 mm (4.4 in), while August is the driest with 0.1 mm (0 in).
How sunny is San Ramon?
San Ramon receives around 3,058 hours of sunshine per year. May is the sunniest month with 324 hours, while December is the cloudiest with just 160 hours. Overall, San Ramon enjoys abundant sunshine.
San Ramon 3-Day Forecast
San Ramon (CA) 3-Day Forecast
San Ramon on the map
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