Listen to Fog Horn on Golden Gate Bridge*
Simultaneously, 2 foghorns on the south tower of the Golden Gate Bridge sound together to make a single blast every 20 seconds, while the Golden Gate Bridge mid-channel fog diaphone sounds two blasts every 40 seconds.
Inbound ships heading into San Francisco Bay steer left of the foghorn on the south tower and right of the mid-channel fog diaphone. Outbound ships stay to the right of the mid-channel fog diaphone. Fog is most prevalent at the Golden Gate in July and August.
The Point Bonita Light is 2.5 miles due west of the Bridge.