San Diego Weather in July
July brings warm weather and usually no rain to San Diego, California. Although this month is more humid than others.
This page gives detailed information on the typical July 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
| 75 °F | July average high | 24 °C |
| 66 °F | July average low | 19 °C |
| 29 days | 70 °F max. or more (21 °C) |
| 29 days | 70 °F min. or less (21 °C) |
Nearly every day in July warms to over 70 degrees Fahrenheit (21 degrees Celsius) in San Diego. The city averages 4 days this month when the thermometer reaches into the 80s °F (over 26 °C). Temperatures above 90 °F (32 °C) occur in July about once a decade.
July does not normally get as cold as 60 °F (16 °C).
Rain
| 0.1 in | total precipitation | 2 mm |
| 1 day | of rain |
Like other summer months, most years, San Diego has no rain in July.
Sun
| 68 % | sunshine |
| 13 days | clear skies |
The sun's rays reach the ground in San Diego during 68 percent of daylight hours on average in July, for a total of 296 hours in the month. Typically on 13 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in July at San Diego lasts for 14 hours and 3 minutes a day on average. The longest day of the month is the 1st with 14 hours and 16 minutes of daylight. By the end of the month, the days have shortened to 13:45 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 75 % | July average humidity |
The relative humidity in San Diego during July usually peaks at 82 percent in the morning then drops to 64 percent by early afternoon. July is the most humid time of the year for San Diego.
| Local Time | 1 am | 4 am | 7 am | 10 am | 1 pm | 4 pm | 7 pm | 10 pm |
| Humidity % | 81 | 82 | 79 | 69 | 64 | 66 | 75 | 80 |
Wind
| 7.5 mph | July wind speed average | 12.1 kph |
July 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 July |
San Diego has a thunderstorm during July about once in five years.
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.