South Monrovia Island, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Monrovia Island, a community in Los Angeles County, California.
Today
75°F
Mostly Sunny
Mostly sunny, with a high near 75. Southwest wind around 5 mph.
7-day forecast for South Monrovia Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Mostly Sunny | 5 mph SW | 0% |
| Tonight | 55°F | Mostly Clear | 0 to 5 mph W | 0% |
| Wednesday | 76°F | Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 57°F | Mostly Clear | 5 mph N | 0% |
| Thursday | 80°F | Sunny | 0 to 5 mph N | 0% |
| Thursday Night | 57°F | Mostly Clear | 0 to 10 mph N | 0% |
| Friday | 83°F | Sunny | 0 to 5 mph NNE | 0% |
| Friday Night | 59°F | Clear | 0 to 15 mph NNE | 0% |
| Saturday | 86°F | Sunny | 0 to 5 mph ESE | 0% |
| Saturday Night | 61°F | Clear | 0 to 15 mph NE | 0% |
| Sunday | 86°F | Sunny | 0 to 5 mph ESE | 0% |
| Sunday Night | 63°F | Partly Cloudy | 0 to 15 mph NE | 0% |
| Monday | 84°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Monday Night | 61°F | Partly Cloudy | 0 to 5 mph ESE | 1% |
Forecast source: National Weather Service (api.weather.gov) for South Monrovia Island (34.123, -117.996). Updated through the day.
Growing snapshot for South Monrovia Island
Last spring frost
Apr 28
First fall frost
Nov 15
Growing season
199 days
Hardiness zone
10a
More local growing data for South Monrovia Island: nearby ZIP 91016 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Mt Wilson Cbs, Ca (6.7 mi from South Monrovia Island). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.