San Francisco Weather in July
Despite it being summer, the temperature remains remarkably mild at San Francisco, California during July. The city usually has no rain for the month, although this is the windiest time of year.
This page gives detailed information on the typical July temperature, precipitation, sun, humidity, wind and storms for San Francisco. The temperature, rainfall, sunshine and wind speed numbers here are historical averages based on climate data gathered in downtown San Francisco near the corner of Buchanan and Hermann Streets. The other measurements are averages at San Francisco International Airport, located south of the city center.
Temperature
| 66 °F | July average high | 19 °C |
| 54 °F | July average low | 12 °C |
| 7 days | 70 °F max. or more (21 °C) |
| 1 day | 50 °F min. or less (10 °C) |
Nearly every day during July sees temperatures of at least 60 degrees Fahrenheit (16 degrees Celsius) in San Francisco. Temperatures above 80 °F (27 °C) are not expected here this month.
The thermometer normally drops into the 50s °F (below 16 °C) every night this month. But July doesn't get as cold as 40 °F (4 °C).
Rain
| 0 in | total precipitation | 0 mm |
| 0 days | of rain |
San Francisco usually receives no rain in July.
Sun
| 66 % | sunshine |
| 21 days | clear skies |
The sun's rays reach the ground in San Francisco during 66 percent of daylight hours on average in July, for a total of 296 hours in the month. Typically on 21 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in July at San Francisco lasts for 14 hours and 27 minutes a day on average. The longest day of the month is the 1st with 14 hours and 44 minutes of daylight. By the end of the month, the days have shortened to 14:06 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 73 % | July average humidity |
The relative humidity in San Francisco during July usually peaks at 86 percent in the morning 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 % | 85 | 86 | 80 | 65 | 56 | 59 | 73 | 82 |
Wind
| 11.2 mph | July wind speed average | 18.0 kph |
July is the windiest month in San Francisco.
Storms
| 0 days | rainfall of 0.5 inches (13 mm) or more |
| 0 days | with thunderstorms in July |
Heavy rainstorms normally don't occur in San Francisco during July. The city has a July thunderstorm just once a decade on average.
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.