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San Ramon, CA
Full City Profile · California · Alameda County County
3.4
/5.0
B
Good
85,734
Population
4,274/sq mi density
$197,358
Median Income
$82,145 per capita
$1,359,100
Home Value
$1,516,679 Zillow
$2,916
Median Rent
28.8% income on rent
57°F
Avg Temperature
322 sunny days/yr
76
Violent Crime/100K
1,439 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$197,358 median income, 3.5% unemployment
C+
Affordability
2.8 / 5.0
$1,359,100 home value, $2,916/mo rent
F
Safety
1.0 / 5.0
76 violent crimes/100K
A+
Education
5.0 / 5.0
71.2% bachelor's degree or higher
San Ramon enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 47°F in January while summers reach 68°F in July. The area gets 322 sunny days per year. Annual precipitation totals 34.2 inches. The area receives 2.8 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
47°F Jan (8°C)
68°F Jul (20°C)
| Annual Average | 56.5°F |
| 5% above US avg | |
| January Average | 47°F (8°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 322 days/yr |
Geography
| Elevation | 650 ft (198 m) |
| Area | 18.1 sq mi (46.8 km²) |
| Population Density | 4,274/sq mi |
| Coordinates | 37.7653°N, 121.9320°W |
| Timezone | America/Los_Angeles |
| County | Alameda County County |
| Nearest Airport | Metro Oakland International (OAK) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0341 ppm |
| NO₂ (Nitrogen Dioxide) | 12.9 ppb |
| SO₂ (Sulfur Dioxide) | 0.09 ppb |
| CO (Carbon Monoxide) | 0.41 ppm |
| PM2.5 (Fine Particles) | 6.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 99.8 / 100 |
| Social Vulnerability | 27.5 / 100 |
| Community Resilience | 91.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Earthquake | Very High |
| Wildfire | Relatively High |
| Flood | Very High |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively High |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively High |
| Tsunami | Relatively Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 4.5 m (15 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1868 | N. CALIFORNIA | Eruption + Earthquake | 4.5 m | 30 | 17 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 81 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 44 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 51 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 63 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (153 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 153 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 47°F (8°C) | 3.8 in | Coldest, Wettest |
| February | 51°F (10°C) | 3.2 in | |
| March | 53°F (12°C) | 3.0 in | |
| April | 57°F (14°C) | 1.2 in | |
| May | 61°F (16°C) | 0.4 in | |
| June | 66°F (19°C) | 0.1 in | |
| July | 68°F (20°C) | 0.0 in | Driest |
| August | 70°F (21°C) | 0.1 in | Warmest |
| September | 69°F (20°C) | 0.3 in | |
| October | 63°F (17°C) | 1.1 in | |
| November | 54°F (12°C) | 2.6 in | |
| December | 47°F (9°C) | 2.9 in |
San Ramon has a seasonal temperature swing of 23°F / from 47°F in January to 70°F in August. Total annual precipitation is 18.7 inches, with January being the wettest month (3.8") and July the driest (0.0").