Is it raining now in San Bruno?
Sunny
9 JulNo upcoming precipitation for the next hour.
Last update: 18:00, 9 Jul 2026
Free to download * Essential from $0.83 * Prices vary by region and promotions.
- App Only
Track up to 20 locations
Home, office, kids' school - all at once, no switching tabs.
- App Only
Alerts for each of them
Get notified 15 minutes before rain - while you can still change your plans.
- App Only
Widgets on your home screen
Live radar without opening the app - on your lock screen or home screen.
Rain in San Bruno: What You Need to Know
San Bruno, California experiences atmospheric river events November–March. The San Bruno rain radar delivers real-time precipitation data from KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento), updated every 4–6 minutes at up to 250-meter resolution — showing exactly when and where rain will arrive, not just whether it might.
Storms in this part of California typically approach from west-southwest off Pacific. RainViewer's hyperlocal radar includes direction arrows and a 2-hour nowcast, so residents and visitors in San Bruno can make informed decisions about travel, outdoor plans, and weather preparation with real advance notice.
Rain by Season in San Bruno
Peak rain season (November–March (atmospheric river season))
San Bruno's highest weather risk aligns with November–March (atmospheric river season). Atmospheric river events november–march drives the primary precipitation events across this region.
Transition months
Seasonal transitions bring variable conditions. A live radar is more reliable than a forecast during these windows when storm behavior is least predictable.
Drier season (May–September)
Precipitation probability drops in San Bruno during May–September. Outdoor activities proceed with lower weather uncertainty during this period.
Why You Need a Rain Radar in San Bruno
Commuters and Drivers in San Bruno
A radar check before leaving gives San Bruno drivers 20+ minutes to adjust departure timing, choose alternate routes, or wait out a fast-moving cell. Real-time radar is more actionable than a forecast probability for daily commute decisions.
Outdoor Workers and Event Planners in San Bruno
Construction crews, outdoor event staff, and recreation managers in San Bruno use the live radar to get 20–30 minutes of advance notice before rain arrives from west-southwest off Pacific. That window is enough to shelter equipment, complete outdoor tasks, or alert attendees.
RainViewer Radar Coverage in San Bruno
RainViewer aggregates radar data for the United States from the NEXRAD network operated by NOAA's National Weather Service — 160 WSR-88D stations covering the contiguous US, Alaska, Hawaii, and US territories. Data updates every 4–6 minutes as each station completes its scan cycle. RainViewer processes and displays NEXRAD data at up to 250-meter resolution, preserving the raw scan data rather than smoothing it into regional averages. For San Bruno, California, the primary NEXRAD source is KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento), providing hyperlocal radar coverage across the area.
San Bruno Rain Radar: Frequently Asked Questions
- Does San Bruno flood when it rains heavily?
San Bruno can experience localized flooding during intense rain, particularly in low-lying areas near drainage channels and road underpasses. Atmospheric river events november–march means runoff can accumulate quickly in parts of California. A live radar gives advance warning to avoid flood-prone areas.
- When is the rainy season in San Bruno?
San Bruno's primary rain season runs through November–March (atmospheric river season), driven by atmospheric river events November–March. The driest period is typically May–September, when outdoor activities carry less weather risk.
- Is there a live rain radar for San Bruno?
Yes — RainViewer shows live NEXRAD data for San Bruno at up to 250-meter resolution, updated every 4–6 minutes from KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento). The map shows current precipitation, storm direction, and a 2-hour nowcast.
- Can I set a rain alert for San Bruno?
RainViewer Essential sends a rain alert 10–15 minutes before precipitation reaches your saved location in San Bruno, California. Set an alert for your specific address — not just a general area warning.
Track Rain in San Bruno in Real Time
Rain in San Bruno can arrive from west-southwest off Pacific faster than a forecast update.
Forecasts cover California broadly. RainViewer shows the exact cell position over San Bruno, updated every 4–6 minutes.
Your weather app shows rain likely near San Bruno. RainViewer shows the cell position and arrival time.
Track rain in San Bruno — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
see when rain will reach San Bruno
Rain alerts before arrival
set an alert for your San Bruno location
Direction arrows
storms approach San Bruno from west-southwest off Pacific
48 hours of radar history
review recent rain patterns in San Bruno
Multiple locations
track San Bruno alongside nearby communities
RainViewer
