Overview

• The inland heat wave builds Wednesday and is forecast to peak Thursday with valley highs between 100°F and 105°F.
• An unusually cool ocean and strong marine layer will confine daytime highs along the coast to the 60s and 70s.
• Heat Impact Days have been declared for Thursday, Friday, Monday and Tuesday to warn residents of elevated risks of heat-related illnesses.
• Valley overnights are expected to remain warm with minimal delta breeze on peak heat days.
• Forecast models show the ridge weakening by mid-next week, bringing gradual cooling and relief from the heat.