Napa, CA Weather & Growing Conditions
Today
83°F
Sunny
Sunny. High near 83, with temperatures falling to around 80 in the afternoon. Southwest wind 1 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 1 to 10 mph SW | 0% |
| Tonight | 53°F | Partly Cloudy then Patchy Fog | 1 to 7 mph SSW | 0% |
| Sunday | 74°F | Patchy Fog then Mostly Cloudy | 1 to 8 mph SW | 0% |
| Sunday Night | 53°F | Mostly Cloudy then Patchy Fog | 5 mph SW | 0% |
| Monday | 75°F | Patchy Fog then Mostly Sunny | 2 to 9 mph SW | 0% |
| Monday Night | 53°F | Partly Cloudy then Patchy Fog | 1 to 9 mph SW | 0% |
| Tuesday | 76°F | Patchy Fog then Mostly Sunny | 1 to 8 mph SW | 0% |
| Tuesday Night | 53°F | Mostly Clear then Patchy Fog | 0 to 8 mph WNW | 0% |
| Wednesday | 86°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph WSW | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 0 to 7 mph WNW | 0% |
| Thursday | 89°F | Mostly Sunny | 0 to 7 mph SW | 0% |
| Thursday Night | 57°F | Mostly Clear | 0 to 7 mph W | 0% |
| Friday | 82°F | Mostly Sunny | 0 to 9 mph WSW | 0% |
| Friday Night | 55°F | Partly Cloudy | 2 to 9 mph WSW | 1% |
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 Sep 19, 2026.