United StatesThe weather in January in Napa
It's cool to moderate in January in Napa with an average temperature of 15°C. Temperatures this month range from a low of 13°C to a high of 18°C. At night, you can expect temperatures between 1°C and 9°C.
Looking for sun and warm weather? January isn’t a good month to be in Napa. The temperatures are too low for a warm stay this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in January for Napa, California. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 27°C in 2021, Napa reached the highest temperature in January over the past 10 years. The lowest daytime temperature in this month was 8°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of -3°C to a highest value of 15°C.
Rainfall amount
In January, there is an average of 203 mm of precipitation, spread over 19 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
Daily weather in January for Napa
Click on any day in January to get detailed info about the usual weather on that day in Napa. Check out the historical temperatures and precipitation over the past 10 years on this day.
January weather comparison
| Napa | New York | |
|---|---|---|
| Average temperature | 15°C | 5°C |
| Max. temperature | 18°C | 11°C |
| Min. temperature | 1°C | -5°C |
| Total precipitation | 203 mm | 97 mm |
| Rainy days | 19 days | 12 days |
Start of January
The month of January starts in Napa with cool temps, averaging around 15°C during the day and nights around 6°C.
Mid January
By mid-January, daytime temps rise to around 16°C, with nights around 7°C. There’s a high chance of precipitation during this time.
End of January
By the end of January, the average daytime temperature in Napa is around 16°C, while nighttime temps are about 6°C. A shower might pop up, but overall, the weather will be dry and sunny.
UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Napa for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in January in Napa, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in January in Napa
Temperature in January in Napa over the years
Precipitation charts
These charts show the average amount of precipitation in January in Napa, California. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in January in Napa
Total precipitation in January in Napa over the years
Daily UV index in January in Napa
This chart shows the average daily UV index in January in Napa, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in January in Napa
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Average weather in Napa by month
Click on a month below to see detailed weather info for Napa. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.