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
87°F
Sunny
Sunny, with a high near 87. South wind 0 to 10 mph.
7-day forecast for South Monrovia Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 0 to 10 mph S | 0% |
| Tonight | 65°F | Patchy Fog | 0 to 5 mph S | 0% |
| Sunday | 84°F | Patchy Fog then Partly Sunny | 0 to 10 mph SSW | 0% |
| Sunday Night | 63°F | Patchy Fog | 0 to 5 mph S | 1% |
| Monday | 81°F | Mostly Sunny | 0 to 10 mph SSW | 1% |
| Monday Night | 62°F | Mostly Clear | 0 to 10 mph S | 1% |
| Tuesday | 83°F | Sunny | 0 to 5 mph SSW | 0% |
| Tuesday Night | 64°F | Mostly Clear | 0 to 5 mph NNW | 0% |
| Wednesday | 90°F | Sunny | 0 to 5 mph WSW | 0% |
| Wednesday Night | 66°F | Mostly Clear | 0 to 5 mph W | 0% |
| Thursday | 91°F | Sunny | 0 to 5 mph WSW | 3% |
| Thursday Night | 67°F | Mostly Clear | 0 to 5 mph SSW | 3% |
| Friday | 91°F | Sunny | 0 to 5 mph S | 3% |
| Friday Night | 67°F | Mostly Clear | 0 to 5 mph SE | 2% |
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 Sep 19, 2026.