Penryn, CA Weather & Growing Conditions
Tonight
44°F
Partly Cloudy
Partly cloudy, with a low around 44. North northeast wind around 3 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Partly Cloudy | 3 mph NNE | 5% |
| Wednesday | 67°F | Sunny | 2 to 7 mph NNW | 0% |
| Wednesday Night | 43°F | Partly Cloudy | 3 mph NE | 0% |
| Thursday | 70°F | Sunny | 5 mph NE | 0% |
| Thursday Night | 45°F | Clear | 3 mph ENE | 0% |
| Friday | 71°F | Sunny | 3 mph W | 0% |
| Friday Night | 48°F | Clear | 3 mph E | 0% |
| Saturday | 74°F | Sunny | 3 mph NNW | 0% |
| Saturday Night | 49°F | Mostly Clear | 3 mph E | 0% |
| Sunday | 74°F | Mostly Sunny | 3 mph WNW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 3 mph ENE | 0% |
| Monday | 72°F | Partly Sunny | 3 mph S | 2% |
| Monday Night | 50°F | Partly Cloudy | 2 mph ESE | 2% |
| Tuesday | 72°F | Mostly Sunny | 3 mph SSE | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Penryn, CA
Last spring frost
Feb 25
First fall frost
Dec 5
Growing season
286 days
Hardiness zone
9b
Explore more for Penryn, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Auburn, Ca (6.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.