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
80°F
Sunny
Sunny, with a high near 80. West wind 5 to 10 mph.
7-day forecast for Bostonia
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Sunny | 5 to 10 mph W | 1% |
| Tonight | 62°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 83°F | Sunny | 0 to 10 mph N | 0% |
| Saturday Night | 62°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Sunday | 81°F | Partly Sunny | 0 to 10 mph S | 0% |
| Sunday Night | 64°F | Mostly Cloudy | 0 to 5 mph SW | 2% |
| Monday | 79°F | Mostly Sunny | 0 to 10 mph SW | 2% |
| Monday Night | 62°F | Partly Cloudy | 0 to 10 mph N | 0% |
| Tuesday | 81°F | Sunny | 0 to 10 mph NW | 0% |
| Tuesday Night | 63°F | Mostly Clear | 0 to 10 mph NW | 0% |
| Wednesday | 87°F | Sunny | 0 to 10 mph NW | 2% |
| Wednesday Night | 66°F | Mostly Clear | 0 to 5 mph NW | 2% |
| Thursday | 89°F | Sunny | 0 to 5 mph NW | 3% |
| Thursday Night | 67°F | Mostly Clear | 0 to 5 mph NW | 1% |
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 Sep 18, 2026.