San Diego Weather in March
March is only slightly warmer than the mild weather of the previous months at San Diego, California.
This page gives detailed information on the typical March temperature, precipitation, sun, humidity, wind and storms for San Diego. The numbers here are historical averages based on climate data gathered at the San Diego International Airport, located on San Diego Bay near the city center.
Temperature
| 67 °F | March average high | 19 °C |
| 55 °F | March average low | 13 °C |
| 6 days | 70 °F max. or more (21 °C) |
| 5 days | 50 °F min. or less (10 °C) |
Nearly every day in March warms to over 60 degrees Fahrenheit (16 degrees Celsius) in San Diego. The city averages 1 day this month when the thermometer reaches into the 80s °F (over 26 °C). Temperatures above 90 °F (32 °C) occur in March about once a decade.
San Diego does not normally get as cold as 40 °F (4 °C) this time of year.
Rain
| 1.5 in | total precipitation | 37 mm |
| 6 days | of rain |
Half the time, San Diego receives 0.6 to 1.4 inches (16 to 37 mm) of rainfall in March. One in four years has drier weather, while another one in four is wetter.
Sun
| 70 % | sunshine |
| 11 days | clear skies |
The sun's rays reach the ground in San Diego during 70 percent of daylight hours on average in March, for a total of 260 hours in the month. Typically on 11 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in March at San Diego lasts for 12 hours and 0 minutes a day on average. The shortest day of the month is the 1st with 11 hours and 30 minutes of daylight. By the end of the month, the days have lengthened to 12:31 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 67 % | March average humidity |
The relative humidity in San Diego during March usually peaks at 75 percent just after midnight then drops to 56 percent by early afternoon.
| Local Time | 1 am | 4 am | 7 am | 10 am | 1 pm | 4 pm | 7 pm | 10 pm |
| Humidity % | 75 | 75 | 73 | 60 | 56 | 59 | 68 | 72 |
Wind
| 7.5 mph | March wind speed average | 12.1 kph |
March is a little windier than most other months in San Diego.
Storms
| 1 day | rainfall of 0.5 inches (13 mm) or more |
| 0 days | with thunderstorms in March |
March is one of the most likely months for a thunderstorm in San Diego. Even so, most Marches have no thunder and lightning.
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.