Typical September highs at South Blue Gum Beach reach about 69°F. South Blue Gum Beach is located in Northwest Marin, California.
Northwest Marin, California · live parking & conditions · updated June 19, 2026
In a typical year September is the warmest month here, with highs near 69°F. Tap South Blue Gum Beach on the map for live surf, wind, water temperature, UV and tide times.
Open South Blue Gum Beach on the map →