Weather in San Diego in January
January in San Diego is cool with average temperatures around 13.3°C (55.9°F). Light rainfall with only 41mm expected.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
18.0°C
64.4°F
Low
8.7°C
47.7°F
Precipitation
41 mm
1.6 inches
~5 rainy days
Conditions
Humidity
64%