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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 Lewiston: What You Need to Know
Lewiston, Idaho experiences Pacific frontal systems and spring snowmelt. The Lewiston rain radar delivers real-time precipitation data from KCBX (Boise), 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 Idaho typically approach from west off Cascades. RainViewer's hyperlocal radar includes direction arrows and a 2-hour nowcast, so residents and visitors in Lewiston can make informed decisions about travel, outdoor plans, and weather preparation with real advance notice.
Rain by Season in Lewiston
Peak rain season (November–March (frontal) and April–May (snowmelt))
Lewiston's highest weather risk aligns with November–March (frontal) and April–May (snowmelt). Pacific frontal systems and spring snowmelt 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 (June–September)
Precipitation probability drops in Lewiston during June–September. Outdoor activities proceed with lower weather uncertainty during this period.
Why You Need a Rain Radar in Lewiston
Commuters and Drivers in Lewiston
A radar check before leaving gives Lewiston 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 Lewiston
Construction crews, outdoor event staff, and recreation managers in Lewiston use the live radar to get 20–30 minutes of advance notice before rain arrives from west off Cascades. That window is enough to shelter equipment, complete outdoor tasks, or alert attendees.
RainViewer Radar Coverage in Lewiston
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 Lewiston, Idaho, the primary NEXRAD source is KCBX (Boise), providing hyperlocal radar coverage across the area.
Lewiston Rain Radar: Frequently Asked Questions
- Does Lewiston flood when it rains heavily?
Lewiston can experience localized flooding during intense rain, particularly in low-lying areas near drainage channels and road underpasses. Pacific frontal systems and spring snowmelt means runoff can accumulate quickly in parts of Idaho. A live radar gives advance warning to avoid flood-prone areas.
- When is the rainy season in Lewiston?
Lewiston's primary rain season runs through November–March (frontal) and April–May (snowmelt), driven by Pacific frontal systems and spring snowmelt. The driest period is typically June–September, when outdoor activities carry less weather risk.
- Is there a live rain radar for Lewiston?
Yes — RainViewer shows live NEXRAD data for Lewiston at up to 250-meter resolution, updated every 4–6 minutes from KCBX (Boise). The map shows current precipitation, storm direction, and a 2-hour nowcast.
- Can I set a rain alert for Lewiston?
RainViewer Essential sends a rain alert 10–15 minutes before precipitation reaches your saved location in Lewiston, Idaho. Set an alert for your specific address — not just a general area warning.
Track Rain in Lewiston in Real Time
Rain in Lewiston can arrive from west off Cascades faster than a forecast update.
Forecasts cover Idaho broadly. RainViewer shows the exact cell position over Lewiston, updated every 4–6 minutes.
Your weather app shows rain likely near Lewiston. RainViewer shows the cell position and arrival time.
Track rain in Lewiston — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
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storms approach Lewiston from west off Cascades
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