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Guerneville, CA
Full City Profile · California · Sonoma County County
3.1
/5.0
B
Good
4,522
Population
466/sq mi density
$84,294
Median Income
$61,088 per capita
$589,600
Home Value
$516,697 Zillow
$1,583
Median Rent
37.4% income on rent
58°F
Avg Temperature
302 sunny days/yr
164
Violent Crime/100K
2,057 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$84,294 median income, 4.4% unemployment
C+
Affordability
2.7 / 5.0
$589,600 home value, $1,583/mo rent
F
Safety
1.0 / 5.0
164 violent crimes/100K
A
Education
4.2 / 5.0
40.3% bachelor's degree or higher
Guerneville enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 48°F in January while summers reach 68°F in July. The area gets 302 sunny days per year. Annual precipitation totals 33.8 inches. Air quality is rated Good with a median AQI of 48.
Temperature
48°F Jan (9°C)
68°F Jul (20°C)
| Annual Average | 58.1°F |
| 8% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 441 ft (134 m) |
| Area | 9.7 sq mi (25.1 km²) |
| Population Density | 466/sq mi |
| Coordinates | 38.5172°N, 122.9899°W |
| Timezone | America/Los_Angeles |
| County | Sonoma County County |
| Nearest Airport | Metro Oakland International (OAK) 69 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0321 ppm |
| NO₂ (Nitrogen Dioxide) | 5.8 ppb |
| CO (Carbon Monoxide) | 0.29 ppm |
| PM2.5 (Fine Particles) | 5.0 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 99.1 / 100 |
| Social Vulnerability | 29.8 / 100 |
| Community Resilience | 66.2 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively High |
| Wildfire | Relatively High |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Very Low |
| Volcano | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
3 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 | 120 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 128 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 101 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (54 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 54 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 8.9 in | Wettest |
| February | 50°F (10°C) | 7.2 in | |
| March | 52°F (11°C) | 6.1 in | |
| April | 55°F (13°C) | 2.4 in | |
| May | 60°F (16°C) | 0.9 in | |
| June | 65°F (18°C) | 0.2 in | |
| July | 68°F (20°C) | 0.1 in | Driest |
| August | 68°F (20°C) | 0.2 in | Warmest |
| September | 66°F (19°C) | 0.6 in | |
| October | 61°F (16°C) | 2.2 in | |
| November | 53°F (12°C) | 6.1 in | |
| December | 47°F (8°C) | 6.8 in | Coldest |
Guerneville has a seasonal temperature swing of 21°F / from 47°F in December to 68°F in August. Total annual precipitation is 41.6 inches, with January being the wettest month (8.9") and July the driest (0.1").