Harman US

Mount Hermon, CA Weather & Growing Conditions

Tonight
53°F
Partly Cloudy then Patchy Fog
Patchy fog after 1am. Partly cloudy, with a low around 53. North wind 1 to 5 mph.

7-day forecast

WhenTempForecastWindPrecip
Tonight 53°F Partly Cloudy then Patchy Fog 1 to 5 mph N 0%
Saturday 82°F Areas Of Fog then Mostly Sunny 0 to 5 mph SE 0%
Saturday Night 54°F Mostly Cloudy 3 mph NW 0%
Sunday 77°F Patchy Fog then Partly Sunny 1 to 5 mph NW 2%
Sunday Night 53°F Patchy Fog 0 to 5 mph NW 2%
Monday 76°F Areas Of Fog then Mostly Sunny 0 to 3 mph W 0%
Monday Night 52°F Patchy Fog 0 to 3 mph NW 0%
Tuesday 81°F Areas Of Fog then Mostly Sunny 0 to 3 mph W 0%
Tuesday Night 54°F Mostly Clear 2 mph NW 0%
Wednesday 90°F Sunny 2 mph WNW 0%
Wednesday Night 59°F Mostly Clear 2 mph NW 0%
Thursday 92°F Sunny 2 mph W 0%
Thursday Night 58°F Partly Cloudy 2 mph NW 0%
Friday 87°F Sunny 0 to 3 mph WNW 0%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Mount Hermon, CA

Last spring frost
Mar 25
First fall frost
Nov 11
Growing season
231 days
Hardiness zone
9a

Explore more for Mount Hermon, CA: full frost dates · planting calendar · California frost dates

Climate data from the nearest NOAA station, Ben Lomond #4, Ca (2.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.