Diablo Grande, CA Weather & Growing Conditions
Overnight
49°F
Mostly Clear
Mostly clear, with a low around 49. West northwest wind around 13 mph, with gusts as high as 22 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Mostly Clear | 13 mph WNW | 0% |
| Wednesday | 65°F | Sunny | 8 to 16 mph NNW | 1% |
| Wednesday Night | 51°F | Mostly Cloudy | 5 to 8 mph WNW | 1% |
| Thursday | 68°F | Mostly Sunny | 5 to 14 mph NNW | 0% |
| Thursday Night | 50°F | Clear | 2 to 7 mph WNW | 0% |
| Friday | 70°F | Sunny | 2 to 8 mph N | 0% |
| Friday Night | 52°F | Mostly Clear | 0 to 6 mph NNW | 0% |
| Saturday | 71°F | Sunny | 0 to 7 mph ENE | 0% |
| Saturday Night | 53°F | Mostly Clear | 0 to 3 mph NNW | 0% |
| Sunday | 72°F | Sunny | 1 to 7 mph NNW | 0% |
| Sunday Night | 55°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Monday | 71°F | Mostly Sunny | 0 to 6 mph NNE | 0% |
| Monday Night | 54°F | Partly Cloudy | 1 to 5 mph WNW | 1% |
| Tuesday | 69°F | Sunny | 1 to 6 mph NNW | 2% |
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 Nov 4, 2026.