United StatesThe weather in January in Santa Rosa
It's cool to moderate in January in Santa Rosa with an average temperature of 16°C. Temperatures this month range from a low of 13°C to a high of 19°C. At night, you can expect temperatures between 1°C and 6°C.
Looking for sun and warm weather? January isn’t a good month to be in Santa Rosa. 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 Santa Rosa, 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 2015, Santa Rosa reached the highest temperature in January over the past 10 years. The lowest daytime temperature in this month was 8°C in 2021. The extreme nighttime temperatures ranged from a lowest recorded value of -4°C to a highest value of 14°C.
Rainfall amount
In January, there is an average of 138 mm of precipitation, spread over 16 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
Daily weather in January for Santa Rosa
Click on any day in January to get detailed info about the usual weather on that day in Santa Rosa. Check out the historical temperatures and precipitation over the past 10 years on this day.
January weather comparison
| Santa Rosa | New York | |
|---|---|---|
| Average temperature | 16°C | 5°C |
| Max. temperature | 19°C | 11°C |
| Min. temperature | 1°C | -5°C |
| Total precipitation | 138 mm | 97 mm |
| Rainy days | 16 days | 12 days |
Start of January
The month of January starts in Santa Rosa with cool temps, averaging around 15°C during the day and nights around 5°C.
Mid January
By mid-January, daytime temps rise to around 16°C, with nights around 5°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of January
By the end of January, the average daytime temperature in Santa Rosa is around 17°C, while nighttime temps are about 5°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
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Temperature charts
These charts show the average temperatures in January in Santa Rosa, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in January in Santa Rosa
Temperature in January in Santa Rosa over the years
Precipitation charts
These charts show the average amount of precipitation in January in Santa Rosa, 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 Santa Rosa
Total precipitation in January in Santa Rosa over the years
Daily UV index in January in Santa Rosa
This chart shows the average daily UV index in January in Santa Rosa, 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 Santa Rosa
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Average weather in Santa Rosa by month
Click on a month below to see detailed weather info for Santa Rosa. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.