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.

Overnight

69°F

Partly Cloudy

Partly cloudy, with a low around 69. South southwest wind around 0 mph.

7-day forecast for South Monrovia Island

When	Temp	Forecast	Wind	Precip
Overnight	69°F	Partly Cloudy	0 mph	0%
Tuesday	94°F	Sunny	0 to 5 mph SW	0%
Tuesday Night	68°F	Mostly Clear	0 to 5 mph SW	0%
Wednesday	93°F	Sunny	0 to 5 mph SW	0%
Wednesday Night	69°F	Mostly Clear	0 to 5 mph SW	0%
Thursday	93°F	Sunny	0 to 5 mph WSW	0%
Thursday Night	68°F	Mostly Clear	0 to 5 mph WSW	0%
Friday	95°F	Sunny	0 to 5 mph WSW	0%
Friday Night	68°F	Mostly Clear	0 to 5 mph SW	0%
Saturday	96°F	Sunny	0 to 5 mph SW	0%
Saturday Night	68°F	Mostly Clear	0 to 5 mph SSW	0%
Sunday	95°F	Sunny	0 to 10 mph WSW	0%
Sunday Night	67°F	Mostly Clear	0 to 10 mph SSW	1%
Monday	92°F	Sunny	0 to 10 mph SSW	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

Nearby towns & communities

Acton Agoura Hills Agua Dulce Alhambra Alondra Park Altadena Arcadia Artesia Avalon Avocado Heights Azusa Baldwin Park Bell Bell Canyon Bell Gardens Bellflower Beverly Hills Bradbury Burbank Calabasas Carson Castaic Cerritos Charter Oak Citrus Claremont Commerce Compton Covina Cudahy

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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 Aug 4, 2026.