Nicasio, CA
Full City Profile · California · Marin County County
3.8
/5.0
B+
Good
113
Population
86/sq mi density
$236,250
Median Income
$134,950 per capita
$2,000,000
Home Value
$1,771,230 Zillow
60°F
Avg Temperature
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.5 / 5.0
$236,250 median income, 5.5% unemployment
D
Affordability
1.9 / 5.0
$2,000,000 home value, /mo rent
A+
Education
5.0 / 5.0
81.9% bachelor's degree or higher
Nicasio enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 50°F in January while summers reach 68°F in July. Annual precipitation totals 34.5 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 28.
Temperature
50°F Jan (10°C)
68°F Jul (20°C)
| Annual Average | 59.5°F |
| 10% above US avg | |
| January Average | 50°F (10°C) |
| July Average | 68°F (20°C) |
Geography
| Elevation | 194 ft (59 m) |
| Area | 1.3 sq mi (3.4 km²) |
| Population Density | 86/sq mi |
| Coordinates | 38.0606°N, 122.7008°W |
| Timezone | America/Los_Angeles |
| County | Marin County County |
| Nearest Airport | Metro Oakland International (OAK) 35 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
| Good Days % | 86.3% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0326 ppm |
| NO₂ (Nitrogen Dioxide) | 9.1 ppb |
| CO (Carbon Monoxide) | 0.31 ppm |
| PM2.5 (Fine Particles) | 5.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.4 / 100 |
| Social Vulnerability | 24.7 / 100 |
| Community Resilience | 99.2 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Very High |
| Tsunami | Relatively Moderate |
| Volcano | 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 | 66 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 135 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | - | 72 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | - | 44 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | - | - | 119 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (101 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 101 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 50°F (10°C) | 7.1 in | |
| February | 53°F (11°C) | 6.9 in | |
| March | 55°F (13°C) | 4.4 in | |
| April | 58°F (14°C) | 2.0 in | |
| May | 61°F (16°C) | 0.9 in | |
| June | 66°F (19°C) | 0.2 in | |
| July | 68°F (20°C) | 0.0 in | Driest |
| August | 68°F (20°C) | 0.1 in | Warmest |
| September | 68°F (20°C) | 0.1 in | |
| October | 63°F (17°C) | 1.5 in | |
| November | 55°F (13°C) | 3.5 in | |
| December | 50°F (10°C) | 7.8 in | Coldest, Wettest |
Nicasio has a seasonal temperature swing of 19°F / from 50°F in December to 68°F in August. Total annual precipitation is 34.5 inches, with December being the wettest month (7.8") and July the driest (0.0").