Los Angeles Metropolitan Area in September

December through March delivers LA at its most livable. Temperatures hover in the 70s, rain occasionally clears the smog, and hiking trails aren't death traps. January and February see the most rainfall - about 3 inches total, which counts as a monsoon by LA standards. This is peak season, so hotel rates climb and beaches get crowded with locals escaping colder climates. Spring brings wildflower blooms to the mountains and perfect beach weather. Summer turns brutal inland - the San Fernando Valley regularly hits 100+ degrees while coastal areas stay pleasant. Fall means fire season and Santa Ana winds that make everyone cranky. But September and October also bring the clearest skies and warmest ocean temperatures. Tourist crowds thin out after Labor Day, making it an ideal time for locals' favorite spots.