Bostonia, CA Weather & Growing Conditions

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

Overnight

66°F

Patchy Fog

Patchy fog. Mostly cloudy, with a low around 66. South wind around 0 mph.

7-day forecast for Bostonia

When	Temp	Forecast	Wind	Precip
Overnight	66°F	Patchy Fog	0 mph	0%
Tuesday	88°F	Patchy Fog then Mostly Sunny	0 to 10 mph SW	1%
Tuesday Night	66°F	Patchy Fog	0 to 5 mph SW	0%
Wednesday	88°F	Patchy Fog then Mostly Sunny	0 to 10 mph SW	1%
Wednesday Night	67°F	Mostly Clear then Patchy Fog	0 to 5 mph SW	1%
Thursday	89°F	Patchy Fog then Sunny	0 to 10 mph SW	1%
Thursday Night	68°F	Patchy Fog	0 to 5 mph W	1%
Friday	92°F	Patchy Fog then Mostly Sunny	0 to 10 mph W	1%
Friday Night	68°F	Mostly Clear	0 to 5 mph SW	0%
Saturday	91°F	Sunny	0 to 10 mph SW	1%
Saturday Night	68°F	Mostly Clear	0 to 5 mph SW	0%
Sunday	90°F	Sunny	0 to 10 mph SW	2%
Sunday Night	67°F	Partly Cloudy	0 to 5 mph SW	4%
Monday	89°F	Sunny	0 to 10 mph SW	7%

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

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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 Aug 4, 2026.