Cool
Average highs are around 17°C, so pack for cooler days.
March verdict
Napa, California, United States in March
Weather score33Poor
Poor for holiday weather
Average highs are around 17°C, so pack for cooler days. Sunshine averages 8.4h per day, so bright days are a strong part of the month. Rainfall averages 107mm, so some wet days are possible.
March weather
Monthly averages
Temp
17°C
Rain
107mm
Sun
8.4h
Sea
11°C
Weather score
33
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 107mm, so some wet days are possible.
Bright
Sunshine averages 8.4h per day, so bright days are a strong part of the month.
Cool sea
Sea temperatures average 11°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
March17°C average high
March 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
March107mm average rain
March 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
March8.4 hours average sun
March sits close to Napa's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
March11°C average sea
March is close to Napa's yearly sea-temperature average, so swimming comfort is fairly typical.
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
March33 weather score
March 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.
