Rio del Mar, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rio del Mar, a community in Santa Cruz County, California.
This Afternoon
66°F
Sunny
Sunny, with a high near 66. West northwest wind around 10 mph, with gusts as high as 18 mph.
7-day forecast for Rio del Mar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Sunny | 10 mph WNW | 0% |
| Tonight | 56°F | Partly Cloudy | 2 to 9 mph N | 0% |
| Saturday | 65°F | Patchy Fog then Mostly Sunny | 1 to 8 mph SE | 0% |
| Saturday Night | 57°F | Mostly Cloudy | 2 to 6 mph NE | 0% |
| Sunday | 64°F | Mostly Cloudy | 2 to 8 mph NW | 2% |
| Sunday Night | 56°F | Mostly Cloudy | 5 to 8 mph WNW | 2% |
| Monday | 63°F | Mostly Sunny | 2 to 9 mph W | 0% |
| Monday Night | 56°F | Partly Cloudy then Patchy Fog | 1 to 9 mph WNW | 0% |
| Tuesday | 65°F | Areas Of Fog | 1 to 7 mph W | 0% |
| Tuesday Night | 57°F | Partly Cloudy | 1 to 7 mph NNW | 0% |
| Wednesday | 70°F | Mostly Sunny | 1 to 5 mph NW | 0% |
| Wednesday Night | 60°F | Partly Cloudy | 3 mph NW | 0% |
| Thursday | 72°F | Mostly Sunny | 1 to 5 mph NW | 0% |
| Thursday Night | 60°F | Partly Cloudy | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Rio del Mar (36.958, -121.885). Updated through the day.
Growing snapshot for Rio del Mar
Last spring frost
Jan 29
First fall frost
Dec 13
Growing season
323 days
Hardiness zone
9b
More local growing data for Rio del Mar: nearby ZIP 95003 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Santa Cruz, Ca (6.8 mi from Rio del Mar). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.