Bethel Island, CA Weather & Growing Conditions
This Afternoon
87°F
Sunny
Sunny, with a high near 87. West northwest wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 87°F | Sunny | 9 mph WNW | 0% |
| Tonight | 59°F | Partly Cloudy | 2 to 9 mph W | 0% |
| Sunday | 81°F | Partly Sunny | 5 to 8 mph W | 0% |
| Sunday Night | 58°F | Mostly Cloudy | 8 mph W | 0% |
| Monday | 83°F | Sunny | 7 to 10 mph W | 0% |
| Monday Night | 58°F | Mostly Clear | 3 to 10 mph WSW | 0% |
| Tuesday | 83°F | Sunny | 3 to 9 mph W | 0% |
| Tuesday Night | 59°F | Mostly Clear | 1 to 9 mph W | 0% |
| Wednesday | 89°F | Sunny | 1 to 6 mph WNW | 0% |
| Wednesday Night | 62°F | Mostly Clear | 1 to 6 mph W | 0% |
| Thursday | 92°F | Sunny | 1 to 7 mph WNW | 0% |
| Thursday Night | 63°F | Mostly Clear | 7 mph W | 0% |
| Friday | 87°F | Sunny | 5 to 12 mph W | 0% |
| Friday Night | 61°F | Mostly Clear | 7 to 12 mph WSW | 0% |
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 Sep 20, 2026.