Rosemont, CA Weather & Growing Conditions
Tonight
48°F
Partly Cloudy
Partly cloudy. Low around 48, with temperatures rising to around 50 overnight. North wind 3 to 8 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Partly Cloudy | 3 to 8 mph N | 7% |
| Wednesday | 68°F | Sunny | 2 to 8 mph NNW | 0% |
| Wednesday Night | 47°F | Partly Cloudy | 2 mph N | 0% |
| Thursday | 70°F | Sunny | 1 to 5 mph NNW | 0% |
| Thursday Night | 45°F | Mostly Clear | 2 mph NNE | 0% |
| Friday | 70°F | Sunny | 2 mph N | 0% |
| Friday Night | 48°F | Clear | 1 mph NE | 0% |
| Saturday | 72°F | Sunny | 1 mph NNW | 0% |
| Saturday Night | 49°F | Mostly Clear | 1 mph N | 0% |
| Sunday | 72°F | Mostly Sunny | 3 mph N | 0% |
| Sunday Night | 50°F | Partly Cloudy | 1 mph N | 0% |
| Monday | 71°F | Partly Sunny | 2 mph S | 1% |
| Monday Night | 49°F | Partly Cloudy | 2 mph NW | 1% |
| Tuesday | 71°F | Mostly Sunny | 2 mph WNW | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rosemont, CA
Last spring frost
Jan 12
First fall frost
Dec 16
Growing season
341 days
Hardiness zone
9b
Explore more for Rosemont, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Sacramento 5 Ese, Ca (2.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.