San Diego Weather in April
April is a transition month for weather at San Diego, California. The climate becomes a little warmer, drier and cloudier than the previous months.
This page gives detailed information on the typical April 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
| 69 °F | April average high | 20 °C |
| 57 °F | April average low | 14 °C |
| 9 days | 70 °F max. or more (21 °C) |
| 27 days | 60 °F min. or less (16 °C) |
Nearly every day in April warms to over 60 degrees Fahrenheit (16 degrees Celsius) in San Diego. The city averages 2 days this month when the thermometer reaches into the 80s °F (over 26 °C). Temperatures above 90 °F (32 °C) occur in April about once or twice a decade.
At night, the thermometer dips to 50 °F (10 °C) or below just once this month. San Diego does not normally get as cold as 40 °F (4 °C) this time of year.
Rain
| 0.7 in | total precipitation | 17 mm |
| 4 days | of rain |
Half the time, San Diego receives 0.2 to 0.9 inches (4 to 22 mm) of rainfall in April. One in four years has drier weather, while another one in four is wetter.
Sun
| 68 % | sunshine |
| 10 days | clear skies |
The sun's rays reach the ground in San Diego during 68 percent of daylight hours on average in April, for a total of 265 hours in the month. Typically on 10 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in April at San Diego lasts for 13 hours and 0 minutes a day on average. The shortest day of the month is the 1st with 12 hours and 33 minutes of daylight. By the end of the month, the days have lengthened to 13:28 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 67 % | April average humidity |
The relative humidity in San Diego during April 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 | 71 | 60 | 56 | 59 | 69 | 72 |
Wind
| 7.8 mph | April wind speed average | 12.6 kph |
April is a little windier than most other months in San Diego.
Storms
| 0 days | rainfall of 0.5 inches (13 mm) or more |
| 0 days | with thunderstorms in April |
Once every few years, San Diego can get 0.5 inches (13 mm) or more of rain in one day during this month.
April averages just one thunderstorm a decade.
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.