San Diego has a Mediterranean climate similar to Los Angeles, averaging only around 260 mm (about 10 inches) of rain a year, concentrated almost entirely in the winter months with a long, reliably dry summer. Because rain is so infrequent, sudden winter storms, particularly atmospheric river events that can pull tropical moisture up from the Pacific, can cause disproportionate flooding and mudslides on hillsides and canyons not built for heavy runoff. The city’s many canyons and washes can fill quickly during these rare but intense events. Because a typical week here involves no rain at all, radar becomes especially useful during the relatively rare unsettled winter spells. NWS Doppler radar KNKX (San Diego/Miramar) covers the region.
Learn more: How Does Rain Radar Work? · Open the full Rain Map
Frequently Asked Questions
Is it raining in San Diego right now?
The live radar map above shows precipitation over San Diego, California in real time. Blue shades indicate light rain, while yellow, orange, and red mark heavier downpours. If no colored echoes appear over San Diego, no significant rain is currently being detected.
How often does the San Diego rain radar update?
The radar refreshes continuously, typically every few minutes, so the map reflects current conditions rather than an hours-old forecast. Press play to animate the most recent frames.
Can I see if a storm is heading toward San Diego?
Yes. Press play on the radar to animate the last few hours of rainfall and watch which way rain cells over California are moving – the clearest way to judge whether a shower will reach San Diego or pass by.
Is this San Diego rain radar free to use?
Yes, completely free – no account, app download, or sign-up required. It works in any browser on desktop and mobile.