San Francisco has a Mediterranean climate with around 580 mm (about 23 inches) of rain a year, concentrated almost entirely in the winter months with a long, dry, famously foggy summer. The city’s biggest rain-related hazard comes from atmospheric river events, narrow bands of concentrated tropical moisture that can be steered directly at the Bay Area and dump a significant share of the winter’s total rainfall in a day or two, sometimes triggering landslides on the city’s many steep hills. Because these events can escalate quickly from routine winter rain to a serious hazard, radar tracking is a genuinely important tool during the wet season. NWS Doppler radar KMUX (San Francisco Bay Area) covers the region.
Learn more: How Does Rain Radar Work? · Open the full Rain Map