Los Osos, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Los Osos, a community in San Luis Obispo County, California.

Overnight

55°F

Patchy Fog

Patchy fog. Cloudy, with a low around 55. Northwest wind around 0 mph.

7-day forecast for Los Osos

When	Temp	Forecast	Wind	Precip
Overnight	55°F	Patchy Fog	0 mph	0%
Tuesday	65°F	Patchy Fog	0 to 10 mph WNW	0%
Tuesday Night	56°F	Patchy Fog	0 to 5 mph NW	0%
Wednesday	66°F	Patchy Fog	0 to 10 mph WNW	0%
Wednesday Night	57°F	Patchy Fog	5 mph NW	0%
Thursday	67°F	Patchy Fog	0 to 10 mph WNW	0%
Thursday Night	56°F	Patchy Fog	0 to 10 mph NW	0%
Friday	70°F	Patchy Fog then Mostly Sunny	0 to 10 mph WNW	0%
Friday Night	57°F	Partly Cloudy	0 to 5 mph NW	0%
Saturday	71°F	Mostly Sunny	0 to 5 mph WNW	0%
Saturday Night	57°F	Partly Cloudy	0 to 5 mph NW	0%
Sunday	70°F	Mostly Sunny	0 to 10 mph WSW	0%
Sunday Night	56°F	Partly Cloudy	0 to 10 mph WNW	1%
Monday	66°F	Mostly Sunny	0 to 10 mph W	1%

Forecast source: National Weather Service (api.weather.gov) for Los Osos (35.307, -120.825). Updated through the day.

Growing snapshot for Los Osos

Last spring frost

Jan 19

First fall frost

Jan 14

Growing season

365 days

Hardiness zone

10a

More local growing data for Los Osos: nearby ZIP 93402 weather · frost dates · planting calendar · California frost dates

Nearby towns & communities

Arroyo Grande Atascadero Avila Beach Blacklake California Polytechnic State University Callender Cambria Cayucos Creston Edna El Paso de Robles (Paso Robles) Garden Farms Grover Beach Los Berros Los Ranchos Morro Bay Nipomo Oceano Pismo Beach San Luis Obispo San Miguel San Simeon Santa Margarita Shandon Templeton Whitley Gardens Woodlands

All California locations ›

Climate data from the nearest NOAA station, Morro Bay Fire Dept, Ca (5 mi from Los Osos). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.