Cool
Average highs are around 14°C, so pack for cooler days.
January verdict
Napa, California, United States in January
Weather score21Poor
Poor for holiday weather
Average highs are around 14°C, so pack for cooler days. Sunshine averages 5.5h per day, enough for a balanced month. Rainfall averages 181mm, so showers are a real planning factor.
January weather
Monthly averages
Temp
14°C
Rain
181mm
Sun
5.5h
Sea
12°C
Weather score
21
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 181mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.5h 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
January14°C average high
January has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
January181mm average rain
January is one of Napa's wettest months, so rain is likely to be a major planning factor.
Driest monthsApril to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
January5.5 hours average sun
January is one of Napa's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsApril to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
January12°C average sea
January 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
January21 weather score
January is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsMay to September
These months have the strongest weather score in the monthly averages.
