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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.