Bethel Island, CA Weather & Growing Conditions
Overnight
50°F
Mostly Clear
Mostly clear, with a low around 50. Northwest wind around 9 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Clear | 9 mph NW | 0% |
| Wednesday | 69°F | Sunny | 7 to 13 mph NW | 1% |
| Wednesday Night | 50°F | Mostly Cloudy | 7 mph W | 1% |
| Thursday | 72°F | Mostly Sunny | 5 to 9 mph NW | 0% |
| Thursday Night | 48°F | Mostly Clear | 1 to 5 mph W | 0% |
| Friday | 71°F | Sunny | 0 to 5 mph NNW | 0% |
| Friday Night | 49°F | Mostly Clear | 0 mph | 0% |
| Saturday | 72°F | Sunny | 0 to 3 mph NNE | 0% |
| Saturday Night | 50°F | Mostly Clear | 2 mph WNW | 0% |
| Sunday | 72°F | Sunny | 0 to 5 mph NW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 0 mph | 0% |
| Monday | 71°F | Mostly Sunny | 0 to 5 mph WNW | 0% |
| Monday Night | 51°F | Partly Cloudy | 3 mph W | 1% |
| Tuesday | 72°F | Patchy Fog then Sunny | 0 to 3 mph NW | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Bethel Island, CA
Last spring frost
Jan 12
First fall frost
Dec 19
Growing season
343 days
Hardiness zone
9b
Explore more for Bethel Island, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Antioch Pumping Plt #3, Ca (7.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.