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United StatesThe weather in January in San Diego
It's pleasantly warm in January in San Diego with an average temperature of 20°C. Temperatures this month range from a low of 18°C to a high of 21°C. At night, you can expect temperatures between 9°C and 13°C.
Looking for great weather? January is a good time to be in San Diego. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in January for San Diego, 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 31°C in 2021, San Diego reached the highest temperature in January over the past 10 years. The lowest daytime temperature in this month was 13°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of 4°C to a highest value of 17°C.
Water temperature
The water temperature at San Diego is 17°C this month. You can swim, but it's a bit chilly.
Rainfall amount
In January, there is an average of 44 mm of precipitation, spread over 8 days. The wind speed is around 3 Bft, mostly coming from the West.
Daily weather in January for San Diego
Click on any day in January to get detailed info about the usual weather on that day in San Diego. Check out the historical temperatures and precipitation over the past 10 years on this day.
January weather comparison
| San Diego | New York | |
|---|---|---|
| Average temperature | 20°C | 5°C |
| Max. temperature | 21°C | 11°C |
| Min. temperature | 9°C | -5°C |
| Total precipitation | 44 mm | 97 mm |
| Rainy days | 8 days | 12 days |
Start of January
The month of January starts in San Diego with mild temps, averaging around 19°C during the day and nights around 11°C.
Mid January
By mid-January, daytime temps rise to around 21°C, with nights around 12°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of January
By the end of January, the average daytime temperature in San Diego is around 20°C, while nighttime temps are about 11°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
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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 San Diego, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in January in San Diego
Temperature in January in San Diego over the years
Precipitation charts
These charts show the average amount of precipitation in January in San Diego, 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 San Diego
Total precipitation in January in San Diego over the years
Daily UV index in January in San Diego
This chart shows the average daily UV index in January in San Diego, 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 San Diego
The weather in January in San Diego is rated 5 out of 5 stars by 1 visitor. Have you been to San Diego? Share your weather experience to help other visitors.
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2 days rain and 2 days heavily cloudy with most of the rain falling in the evening/night and becoming dry in the morning. Many sunny days with occasional light clouds. Temperatures from 18 to 24 degrees during the day. Evening temperatures averaging 8 - 10 degrees. Was even heat records broken in the month of January.— This text is automatically translated to English
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Average weather in San Diego by month
Click on a month below to see detailed weather info for San Diego. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.