July weather forecastSan Francisco, CA
July
Weather in July
July holds the title as San Francisco's warmest month of the year. However, average temperatures remain quite mild, maxing out at 72.1°F (22.3°C). Despite the prevailing summer-like conditions, San Francisco's July is characterized by cool, windy evenings. The city becomes a favorite spot for tourists seeking a respite from the scorching summer temperatures elsewhere. As August approaches, expect minimal changes in the weather conditions, maintaining the climatic consistency over the summer months.Temperature
The transition into July reveals an average high-temperature of a still pleasant 72.1°F (22.3°C), mirroring a close resemblance to June. The temperature in San Francisco dips to an average of 55°F (12.8°C) during July nights.Humidity
In San Francisco, the average relative humidity in July is 73%.Rainfall
The months with the least rainfall in San Francisco, California, are July through September Rain falls for 2.3 days and accumulates 0.08" (2mm) of rain.Ocean temperature
In San Francisco, the average seawater temperature in July is 55.4°F (13°C).Note: Swimming in 55.4°F (13°C) can be lethal. Merely spending a few minutes in 55.4°F (13°C) waters feels harsh, and venturing below 50°F (10°C) might disrupt breathing control and bring about cold shock, contingent on individual resilience.
Daylight
The average length of the day in July is 14h and 28min.On the first day of the month, sunrise is at 5:51 am and sunset at 8:35 pm. On the last day of July, in San Francisco, California, sunrise is at 6:13 am and sunset at 8:18 pm PDT.
Sunshine
With an average of 11.8h of sunshine, July has the most sunshine of the year.UV index
The months with the highest UV index are April, June through September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 5 during July translates into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
San Francisco, CA
- Average high temperature in July: 72.1°F
The warmest month (with the highest average high temperature) is September (73.2°F).
The month with the lowest average high temperature is December (55.8°F).
- Average low temperature in July: 55°F
The month with the highest average low temperature is September (56.7°F).
The coldest months (with the lowest average low temperature) are January and December (45.9°F).
Average pressure in July
San Francisco, CA
- Average pressure in July: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in July
San Francisco, CA
- Average wind speed in July: 6.5mph
The windiest month (with the highest average wind speed) is May (7.6mph).
The calmest month (with the lowest average wind speed) is November (5.5mph).
Average humidity in July
San Francisco, CA
- Average humidity in July: 73%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (67%).
Average rainfall in July
San Francisco, CA
- Average rainfall in July: 0.08"
The wettest month (with the highest rainfall) is February (1.38").
The driest months (with the least rainfall) are July, August and September (0.08").
Average rainfall days in July
San Francisco, CA
- Average rainfall days in July: 2.3 days
The month with the highest number of rainy days is March (9.3 days).
The month with the least rainy days is June (1.9 days).
Average sea temperature in July
San Francisco, CA
- Average sea temperature in July: 55.3°F
The best month for swimming (with the highest average sea temperature) is September (57.3°F).
The coldest months (with the lowest average sea temperature) are April and June (53°F).
Average daylight in July /
Average sunshine in July
San Francisco, CA
- Average daylight in July: 14h and 30min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in July: 11h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in July
San Francisco, CA
- Average sunshine days in July: 24.9 days
The month with the most sunshine days is October (25.8 days).
The month with the least sunshine days is March (20.8 days).
Average UV index in July
San Francisco, CA
- Average UV index in July: 5
The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in July
San Francisco, CA
- Average cloud cover in July: 14
The month with the most cloud cover is March (Cloud cover 36).
The months with the least cloud cover are July and September (Cloud cover 14).
Average visibility in July
San Francisco, CA
- Average visibility in July: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
