Is it raining now in Pasadena?
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9 JulNo upcoming precipitation for the next hour.
Last update: 18:00, 9 Jul 2026
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Rain in Pasadena: What You Need to Know
Pasadena, California experiences Mediterranean climate. The Pasadena rain radar provides hyperlocal radar coverage updated every 4–6 minutes from KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento), showing exactly when and where precipitation will reach the area — a level of precision that city-wide forecasts cannot match. Rain in Pasadena is shaped by mediterranean climate; 86% of annual rain falls november–march in atmospheric river events; fire-season burn scars amplify mudslide risk.
RainViewer draws on live NEXRAD data from KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento) to show precipitation at up to 250-meter resolution across Pasadena and surrounding California communities. Storms typically approach from west-southwest off Pacific, and the live map shows the cell's movement vector — giving residents, commuters, and outdoor workers the advance notice they need before conditions change.
Rain by Season in Pasadena
Peak rain season (November–March (atmospheric river season))
Pasadena sees its most active weather during November–March (atmospheric river season). Mediterranean climate drives the primary precipitation risk during this window.
Transition months
Seasonal transitions bring variable conditions to Pasadena — conditions can shift rapidly and forecast accuracy is lower than during the established wet or dry season.
Drier season (May–September)
During May–September, precipitation risk in Pasadena drops significantly. This is the most reliable window for outdoor activities and events, though no season is entirely risk-free.
Why You Need a Rain Radar in Pasadena
Pasadena Flood-Zone Residents and Property Managers
Pasadena's Arroyo Seco drainage and San Gabriel River tributary flooding can rise rapidly during intense rain events. A live radar showing an intense cell approaching from west-southwest off Pacific gives residents and property managers 20–30 minutes to move vehicles, prepare drainage systems, and alert household members before conditions become dangerous.
Commuters and Highway Drivers in Pasadena
Rain events in Pasadena can close roads and create dangerous driving conditions with minimal warning. Checking the radar 20 minutes before departure reveals whether an incoming cell will clear before your route or whether a 30-minute delay will mean dry roads — a practical decision that saves time and reduces flood-crossing risk on Pasadena's most weather-sensitive corridors.
Outdoor Recreation and Event Planning in Pasadena
Pasadena's outdoor venues, parks, and recreational areas are directly exposed to the seasonal rain events that characterize California's November–March (atmospheric river season) weather window. A live radar check 30–60 minutes ahead tells event managers and outdoor enthusiasts whether to proceed with outdoor plans or prepare for disruption.
RainViewer Radar Coverage in Pasadena
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 Pasadena, California, the primary NEXRAD source is KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento), providing hyperlocal radar coverage across the area.
Pasadena Rain Radar: Frequently Asked Questions
- Does Pasadena flood when it rains heavily?
Yes — Pasadena's Arroyo Seco drainage and San Gabriel River tributary flooding creates documented flood risk during intense rain events. Mediterranean climate means that rainfall runs off rapidly into drainage channels and low-lying streets. Avoiding arroyo crossings and low underpasses during active radar cells reduces flood risk significantly.
- When is Pasadena's rainy season?
Pasadena's primary rain season runs through November–March (atmospheric river season), when Mediterranean climate drives the most active weather. The driest period is typically May–September, when outdoor activities and travel planning carry the lowest weather risk.
- Why is rain in Pasadena so hard to predict precisely?
Pasadena's rain character is shaped by Mediterranean climate, which creates localized precipitation patterns that vary significantly across the city. A forecast covers the broader California region; a hyperlocal radar at 250-meter resolution shows the actual cell position over Pasadena in real time, updated every 4–6 minutes from KVTX (Los Angeles) / KMUX (Mt Umunhum/San Jose) / KBBX (Sacramento).
- Is there a live rain radar for Pasadena?
Yes — RainViewer displays live NEXRAD data for Pasadena 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 movement direction, and a 2-hour nowcast — so you can see whether the cell approaching from west-southwest off Pacific will reach Pasadena or change track before arrival.
Track Rain in Pasadena in Real Time
Rain in Pasadena changes fast — a live radar gives you the 20-minute window a forecast never can.
Forecasts cover the region. RainViewer shows the cell position over Pasadena right now.
Your weather app shows rain likely near Pasadena. RainViewer shows the cell's exact position.
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