Temperatures in January
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.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Napa in January. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of January
The month of January starts in Napa with cool temperatures, averaging around 15°C during the day and nights close to 6°C. Plenty of days with a chance of precipitation.
Mid-January
By mid-January, the average daytime temperature rises to around 16°C, with nights close to 7°C. The chance of precipitation is high during this period.
End of January
By the end of January, the average daytime temperature in Napa will be around 16°C, with nights close to 6°C. A shower might show up, but overall the weather will be dry and sunny.
Precipitation in January
In January, there is an average of 203 mm of precipitation, spread over 8 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
The average precipitation chance is 27% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in January for Napa. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Napa in January |
London | ||
|---|---|---|---|
 Average Temperature |
15°C | 8°C | |
 High Temp |
18°C | 9°C | |
| Low Temp |
13°C | 6°C | |
 Total Precipitation |
203 mm | 58 mm | |
| Rainy Days |
8 days | 9 days | |
December
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.
Is January a good time to visit Napa?
Looking for sun and warm weather? Then January isn’t the best time to be in Napa. The temperature is too low this month for a warm stay.
Temperature records for Napa in January
With 27°C, Napa hit the highest temperature in the last 10 years in January 2021. The lowest daytime temperature in this month was 8°C in 2020. The extreme night temperatures ranged from a low of -3°C to a high of 15°C.
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Daily Temperature in January in Napa
This chart shows the average daily temperatures, both day and night, for each day in January in Napa, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in January in Napa
The chart below shows the average daily precipitation in January for Napa, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for January, you can expect around 8 days of rain in Napa.
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.
Temperature in January in Napa Over the Years
This chart shows the average temperature in January in Napa, measured in degrees Celsius, over the past years.
Total Precipitation in January in Napa Over the Years
This chart shows the average precipitation in January in Napa, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in January for Napa
Click on a specific day in January for detailed info on the typical weather on that day in Napa. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in January in Napa
Have you been to Napa in January?
Share your weather experience in January in Napa.
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.
