Is it raining now in Honolulu?
Light rain
9 JulStarting at 15:10, ending at 15:40.
Last update: 15:00, 9 Jul 2026
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Rain in Honolulu: What You Need to Know
Honolulu receives rainfall year-round during October–February (Kona storm season for leeward areas); year-round windward, and the Honolulu rain radar shows what a standard forecast cannot: exactly which streets are in the path of an incoming cell and how many minutes remain before it arrives. A hyperlocal radar is the practical tool for anyone navigating Honolulu's weather — from commuters on the freeway to outdoor event organizers to residents near Manoa and Nuuanu Streams flood during Kona storms.
The geography that shapes Honolulu's rain risk comes from tropical with dramatic orographic variability; windward Ko'olau slopes receive 200+ inches while leeward Honolulu receives 18; Kona storms bring rare rain to normally dry leeward areas October–February. When intense cells develop, they approach primarily from southwest (Kona storms) or northeast (trade wind), and the local terrain concentrates runoff into Manoa and Nuuanu Streams flood during Kona storms rapidly. Standard 12-hour forecasts cover the broader region; a live radar shows the cell boundary at 250-meter resolution — the neighborhood-level distinction that changes whether you leave now or wait 30 minutes.
RainViewer pulls live NEXRAD data from PHKI (South Kauai) / PHMO (Molokai), updated every 4–6 minutes. The map shows the exact storm position and movement vector over Honolulu, Hawaii, including direction arrows showing whether a cell is tracking toward the city center or moving away. What the live map reveals that no forecast can: whether the cell building to the southwest will reach your specific block in Honolulu or dissipate before arrival.
Rain by Season in Honolulu
Peak rain season (October–February (Kona storm season for leeward areas); year-round windward)
Honolulu's highest-risk weather window aligns with October–February (Kona storm season for leeward areas); year-round windward, when tropical with dramatic orographic variability drives the most intense precipitation events. This is when Manoa and Nuuanu Streams flood during Kona storms is most likely to cause disruption and when the radar is most operationally valuable for anyone planning outdoor activities, managing outdoor venues, or commuting through flood-prone corridors in Honolulu.
Transition months
The weeks before and after the main rain season bring unpredictable conditions in Honolulu — storm intensity varies widely, and forecast models are least reliable during these transitions. Outdoor activities, construction schedules, and event planning in Honolulu are most vulnerable to unexpected weather during the seasonal transition windows.
Drier season (May–September (leeward))
During May–September (leeward), Honolulu sees its lowest rain probability. Outdoor events, construction, and recreational activities proceed with reduced weather risk. Some residual risk remains from occasional frontal systems or isolated convection, but Honolulu is most reliably dry during this period.
Why You Need a Rain Radar in Honolulu
Honolulu Flood-Zone Residents and Property Managers
Honolulu's Manoa and Nuuanu Streams flood during Kona storms can rise rapidly during intense rain events. A live radar showing an intense cell approaching from southwest (Kona storms) or northeast (trade wind) 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 Honolulu
Rain events in Honolulu 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 Honolulu's most weather-sensitive corridors.
Outdoor Recreation and Event Planning in Honolulu
Honolulu's outdoor venues, parks, and recreational areas are directly exposed to the seasonal rain events that characterize Hawaii's October–February (Kona storm season for leeward areas); year-round windward 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.
Military Operations in Honolulu
Honolulu's military sector operates facilities and transportation networks sensitive to weather disruptions. Rain events that cause road closures, reduce visibility, or create safety hazards for outdoor workers are most actionable with 20–30 minutes' advance warning from a live radar — enough time to shelter workers, delay vehicle dispatches, or alert logistics teams before conditions deteriorate.
RainViewer Radar Coverage in Honolulu
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 Honolulu, Hawaii, the primary NEXRAD source is PHKI (South Kauai) / PHMO (Molokai), providing hyperlocal radar coverage across the area.
Honolulu Rain Radar: Frequently Asked Questions
- Does Honolulu flood when it rains heavily?
Yes — Honolulu's Manoa and Nuuanu Streams flood during Kona storms creates documented flood risk during intense rain events. Tropical with dramatic orographic variability means that rainfall runs off rapidly into drainage channels and low-lying streets. Avoiding manoa crossings and low underpasses during active radar cells reduces flood risk significantly.
- When is Honolulu's rainy season?
Honolulu's primary rain season runs through October–February (Kona storm season for leeward areas); year-round windward, when tropical with dramatic orographic variability drives the most active weather. The driest period is typically May–September (leeward), when outdoor activities and travel planning carry the lowest weather risk.
- Why is rain in Honolulu so hard to predict precisely?
Honolulu's rain character is shaped by tropical with dramatic orographic variability, which creates localized precipitation patterns that vary significantly across the city. A forecast covers the broader Hawaii region; a hyperlocal radar at 250-meter resolution shows the actual cell position over Honolulu in real time, updated every 4–6 minutes from PHKI (South Kauai) / PHMO (Molokai).
- Is there a live rain radar for Honolulu?
Yes — RainViewer displays live NEXRAD data for Honolulu at up to 250-meter resolution, updated every 4–6 minutes from PHKI (South Kauai) / PHMO (Molokai). The map shows current precipitation, storm movement direction, and a 2-hour nowcast — so you can see whether the cell approaching from southwest (Kona storms) or northeast (trade wind) will reach Honolulu or change track before arrival.
- How quickly do storms move through Honolulu?
Storm speed varies, but most convective cells affecting Honolulu move at 20–40 mph, giving 15–30 minutes of advance warning when a cell appears on the radar 10–15 miles away. Stalling systems — which bring the most severe flooding — are visible on radar as cells with little lateral movement over Honolulu's watershed.
- Can I get a rain alert before storms reach Honolulu?
RainViewer Essential sends a rain alert 10–15 minutes before precipitation reaches your saved location in Honolulu. Set an alert for your home, workplace, or outdoor venue — the alert fires when radar confirms rain approaching your specific pin, not just a general Honolulu area warning.
- How accurate is the rain radar for Honolulu?
NEXRAD radar data from PHKI (South Kauai) / PHMO (Molokai) is updated every 4–6 minutes and processed at up to 250-meter resolution — significantly more precise than standard weather app forecasts. For Honolulu, this means the radar can distinguish whether rain is falling in one neighborhood while an adjacent area remains dry, a distinction that is common during Honolulu's primary rain season.
- What should I do when the Honolulu rain radar shows a severe cell approaching?
When the radar shows a fast-moving intense cell (deep red or purple colors) approaching Honolulu from southwest (Kona storms) or northeast (trade wind), allow 20–30 minutes to complete outdoor tasks, move vehicles from flood-prone areas near manoa corridors, and ensure outdoor workers or guests are aware. Most Honolulu convective cells clear within 45–90 minutes, so waiting out an approaching cell is often the practical choice.
Track Rain in Honolulu in Real Time
Honolulu's Manoa can rise within 30 minutes of an intense cell — the radar gives you the window a forecast cannot.
A forecast tells you rain is likely. The radar tells you the cell is approaching from southwest (Kona storms) or northeast (trade wind) and will reach Honolulu in 18 minutes.
Your weather app says storms likely for Honolulu. RainViewer shows the cell is 8 miles from Honolulu center and arriving in 12 minutes.
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2-hour forecast in 5-minute slices
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Rain alerts before arrival
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Direction arrows on the map
Honolulu storms arrive predominantly from southwest (Kona storms) or northeast (trade wind); arrows show the exact track
48 hours of radar history
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