• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer
ask Dr Zag

ask Dr Zag

Questions & Facts

  • Local questions
  • Topics
  • Ask
  • Reset location
  • San Francisco

What causes the fog in San Francisco?

Last updated January 23, 2021 by ZagBot Comment

San Francisco experiences foggy weather, particularly in summer, as the hot air in California’s Central Valley rises upwards, creating a low pressure region that causes the cooler moist air sitting over the surface of the Pacific Ocean to be sucked inland.

The air over the Pacific Ocean is laden with moisture which condenses into water droplets as it moves over cooler areas of sea along the northern California coastline, essentially forming very low cloud or fog. The fog, known as advection fog, tends to peak in July and August when the inland valley temperature is at its highest, and movement of sea currents along the California coast cause cold water from the depths of the ocean to rise to the surface leading to further cooling of the air layer above the sea.

San Francisco is particularly prone to fog because of its location by the ocean at the entrance to the Golden Gate Strait. This opening in the coastline provides an ideal route for the cool air flowing in off the ocean which drags the sea fog in with it.

Leave a Review Cancel reply

Your email address will not be published. Required fields are marked *

Select a rating

Primary Sidebar

San Francisco
San Francisco
California
94118
United States

No Records Found

Sorry, no records were found. Please adjust your search criteria and try again.

Google Map Not Loaded

Sorry, unable to load Google Maps API.

  • Bayview-Hunters Point
  • Civic Center
  • Cow Hollow
  • Diamond Heights
  • Financial District
  • Golden Gate Park
  • Haight-Ashbury
  • Mission District
  • North Beach
  • Portero Hill
  • Presidio
  • Russian Hill
  • Sea Cliff
  • South of Market
  • Tenderloin
  • Twin Peaks
  • Western Addition

Footer

About Us
  • Careers
  • Contact
  • FAQ
FAQ
  • Login
  • Terms of Use
  • Privacy policy
  • Community guidelines

Copyright © 2023 Petryal

  • Terms and Conditions
Change Location
Find awesome listings near you!