Harman US

Diablo Grande, CA Weather & Growing Conditions

Tonight
62°F
Partly Cloudy
Partly cloudy. Low around 62, with temperatures rising to around 64 overnight. West northwest wind 2 to 6 mph.

7-day forecast

WhenTempForecastWindPrecip
Tonight 62°F Partly Cloudy 2 to 6 mph WNW 0%
Sunday 82°F Partly Sunny 2 to 7 mph ENE 0%
Sunday Night 58°F Mostly Cloudy 5 mph WNW 0%
Monday 83°F Sunny 5 to 8 mph NNW 0%
Monday Night 58°F Mostly Clear 2 to 6 mph WNW 0%
Tuesday 85°F Sunny 2 to 6 mph NNE 0%
Tuesday Night 63°F Clear 0 to 6 mph WNW 0%
Wednesday 89°F Sunny 0 to 6 mph N 0%
Wednesday Night 69°F Mostly Clear 0 to 6 mph WNW 0%
Thursday 93°F Sunny 0 to 8 mph NE 0%
Thursday Night 69°F Mostly Clear 1 to 7 mph W 0%
Friday 88°F Sunny 1 to 8 mph W 0%
Friday Night 64°F Mostly Clear 2 to 8 mph W 1%
Saturday 83°F Sunny 2 to 8 mph NNW 1%

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

Growing snapshot for Diablo Grande, CA

Last spring frost
Feb 26
First fall frost
Nov 29
Growing season
273 days
Hardiness zone
9b

Explore more for Diablo Grande, CA: full frost dates · planting calendar · California frost dates

Climate data from the nearest NOAA station, Newman, Ca (14.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.