Cool
Average highs are around 18°C, so pack for cooler days.
Weather Guide
Napa, California, United States Average Monthly Weather
Weather score47Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 21°C, sunshine averages 8.5h per day, and rainfall totals about 807mm. Sea temperatures average 12°C across the year.
Annual weather
Annual averages
Temp
21°C
Rain
807mm
Annual total
Sun
8.5h
Sea
12°C
Weather score
47
Mixed avg
Seasonal climate calendar
Trip feel
Showers
Rainfall averages 116mm, so some wet days are possible.
Some sun
Sunshine averages 5.7h per day, enough for a balanced month.
Cool sea
Sea temperatures average 12°C, so the water can feel cool.
Map
Weather map
Compare Napa, California, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
November18°C average high
November is on the cooler side of Napa's year, useful if you prefer less intense daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
November116mm average rain
November sits near Napa's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsApril to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
November5.7 hours average sun
November is below Napa's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsApril to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
November12°C average sea
November sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJanuary and August to December
Sea temperatures are usually near 12°C in this stretch, so swimming comfort is at its strongest.
Weather score
November28 weather score
November scores below Napa's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsMay to September
These months have the strongest weather score in the monthly averages.
