Suisun Valley has a semi-coastal Mediterranean climate with a cool wet season from November to April, followed by a warm dry season. Moist winds blow inland from San Pablo Bay and Suisun Bay at the headwaters of San Francisco Bay almost continuously from May through October, which minimizes frost danger.
Suisun Valley has a Mediterranean climate with distinct wet and dry seasons, featuring mild winters from November to April and warm summers from May to October. Moist air from San Pablo Bay and Suisun Bay reaches inland areas throughout the year, reducing frost risks.