Napa, CA Weather & Growing Conditions
Overnight
56°F
Partly Cloudy
Partly cloudy, with a low around 56. South southwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Partly Cloudy | 2 mph SSW | 0% |
| Tuesday | 85°F | Haze then Sunny | 2 to 9 mph SSW | 0% |
| Tuesday Night | 55°F | Partly Cloudy | 2 to 8 mph SSW | 0% |
| Wednesday | 84°F | Mostly Sunny | 2 to 9 mph SW | 0% |
| Wednesday Night | 56°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Thursday | 84°F | Sunny | 2 to 9 mph WSW | 0% |
| Thursday Night | 56°F | Mostly Clear | 2 to 9 mph WSW | 0% |
| Friday | 89°F | Sunny | 2 to 9 mph WSW | 0% |
| Friday Night | 57°F | Mostly Clear | 1 to 9 mph WSW | 0% |
| Saturday | 87°F | Sunny | 1 to 9 mph SW | 0% |
| Saturday Night | 58°F | Mostly Clear | 1 to 9 mph SW | 0% |
| Sunday | 84°F | Sunny | 1 to 9 mph SW | 0% |
| Sunday Night | 56°F | Mostly Clear | 3 to 9 mph SW | 0% |
| Monday | 76°F | Mostly Sunny | 3 to 10 mph SSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Napa, CA
Last spring frost
Feb 12
First fall frost
Dec 4
Growing season
299 days
Hardiness zone
9b
Explore more for Napa, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Napa State Hospital, Ca (2.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.