Is it raining now in Half Moon Bay?
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19 JulNo upcoming precipitation for the next hour.
Last update: 05:00, 19 Jul 2026
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Rain in Half Moon Bay: What You Need to Know
Half Moon Bay, California experiences atmospheric rivers November–March. The Half Moon Bay rain radar delivers real-time NEXRAD data from KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento), updated every 4–6 minutes at up to 250-meter resolution. Storms in this part of California typically approach from west-southwest off Pacific, and RainViewer's hyperlocal radar shows their exact position and direction so you can act before conditions change.
A standard forecast covers the broader California region. RainViewer shows the actual cell over Half Moon Bay right now — with direction arrows and a 2-hour nowcast so residents and visitors can make real decisions, not guesses.
Rain by Season in Half Moon Bay
Peak rain season (November–March (atmospheric river season))
Half Moon Bay's highest weather risk aligns with November–March (atmospheric river season). Atmospheric rivers november–march drives precipitation events in this region.
Transition months
Seasonal transitions bring variable conditions — a live radar is more reliable than a forecast during these less predictable windows.
Drier season (May–September)
Precipitation probability drops in Half Moon Bay during May–September, allowing outdoor activities to proceed with lower weather risk.
Why You Need a Rain Radar in Half Moon Bay
Commuters and Drivers in Half Moon Bay
A radar check before leaving gives Half Moon Bay drivers 20+ minutes to adjust timing or avoid flood-prone roads. Real-time NEXRAD is more actionable than a forecast probability for daily commute decisions in California.
Outdoor Planning in Half Moon Bay
Residents and visitors planning outdoor activities in Half Moon Bay benefit from knowing exactly when rain will arrive from west-southwest off Pacific. A live radar replaces forecast uncertainty with a real decision window.
RainViewer Radar Coverage in Half Moon Bay
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. For Half Moon Bay, California, the primary NEXRAD source is KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento).
Half Moon Bay Rain Radar: Frequently Asked Questions
- Does Half Moon Bay flood when it rains?
Half Moon Bay can experience localized flooding during intense rain events, particularly in low-lying areas near drainage channels. Atmospheric rivers november–march means runoff can accumulate quickly in parts of California. A live radar provides advance warning before conditions develop.
- When is the rainy season in Half Moon Bay?
Half Moon Bay's primary rain season runs through November–March (atmospheric river season). The driest period is typically May–September.
- Is there a live rain radar for Half Moon Bay?
Yes — RainViewer shows live NEXRAD data for Half Moon Bay at up to 250-meter resolution, updated every 4–6 minutes from KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento). The hyperlocal radar includes current precipitation, storm direction, and a 2-hour nowcast.
- Can I set a rain alert for Half Moon Bay?
RainViewer Essential sends a rain alert 10–15 minutes before precipitation reaches your saved location in Half Moon Bay, California. Set an alert for your specific address — not just a general California area warning.
Track Rain in Half Moon Bay in Real Time
Rain can arrive in Half Moon Bay faster than a forecast update — a live radar gives you the window to act.
Forecasts cover California broadly. RainViewer shows the cell position over Half Moon Bay right now.
Your weather app shows rain likely near Half Moon Bay. RainViewer shows the cell position and minutes to arrival.
Track rain in Half Moon Bay — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
see when rain will reach Half Moon Bay
Rain alerts before arrival
set an alert for your Half Moon Bay address
Direction arrows
storms approach Half Moon Bay from west-southwest off Pacific
48 hours of radar history
review recent rain patterns in Half Moon Bay
Multiple locations
track Half Moon Bay alongside nearby communities
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