Bostonia, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Bostonia, a community in San Diego County, California.

This Afternoon

76°F

Mostly Sunny

Mostly sunny, with a high near 76. Northwest wind 5 to 10 mph.

7-day forecast for Bostonia

When	Temp	Forecast	Wind	Precip
This Afternoon	76°F	Mostly Sunny	5 to 10 mph NW	1%
Tonight	56°F	Slight Chance Rain Showers	0 to 5 mph NW	16%
Wednesday	76°F	Patchy Fog then Mostly Sunny	0 to 5 mph NW	0%
Wednesday Night	55°F	Mostly Clear	0 to 5 mph NE	0%
Thursday	80°F	Sunny	0 to 5 mph W	0%
Thursday Night	56°F	Mostly Clear	0 to 5 mph N	0%
Friday	85°F	Sunny	0 to 5 mph N	0%
Friday Night	57°F	Clear	5 to 10 mph NE	0%
Saturday	89°F	Sunny	0 to 5 mph NE	0%
Saturday Night	59°F	Mostly Clear	5 to 10 mph NE	0%
Sunday	89°F	Sunny	0 to 5 mph NW	0%
Sunday Night	62°F	Partly Cloudy	5 to 10 mph NE	0%
Monday	86°F	Mostly Sunny	0 to 5 mph W	0%
Monday Night	60°F	Partly Cloudy	0 to 5 mph N	0%

Forecast source: National Weather Service (api.weather.gov) for Bostonia (32.819, -116.942). Updated through the day.

Growing snapshot for Bostonia

Last spring frost

Jan 6

First fall frost

Dec 21

Growing season

350 days

Hardiness zone

10a

More local growing data for Bostonia: nearby ZIP 92020 weather · frost dates · planting calendar · California frost dates

Nearby towns & communities

Alpine Bonita Bonsall Borrego Springs Boulevard Camp Pendleton Mainside Camp Pendleton South Campo Carlsbad Casa de Oro-Mount Helix Chula Vista Coronado Crest Del Dios Del Mar Descanso El Cajon Elfin Forest Encinitas Escondido Eucalyptus Hills Fairbanks Ranch Fallbrook Granite Hills Harbison Canyon Harmony Grove Hidden Meadows Imperial Beach Jacumba Jamul

All California locations ›

Climate data from the nearest NOAA station, El Cajon, Ca (2.4 mi from Bostonia). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.