Hawaii Storm Sets New Rainfall Records

A significant Kona low weather system delivered unprecedented rainfall across the Hawaiian Islands from March 12 to 15, 2026. This atmospheric event resulted in extensive flooding, isolated communities, and disrupted power for approximately 130,000 customers.

The slow-moving storm lingered north of the archipelago for nearly five days, generating rainfall totals that surpassed historical measurements dating back to 1951. The intensity of the precipitation led to numerous record-breaking figures across multiple islands.

Record Rainfall Totals

Specific locations reported exceptional accumulations. The West Maui Mountains recorded 27.5 inches of rain over a three-day period. Near the summit of Haleakala, nearly 40 inches were measured, highlighting the extreme nature of the weather event.

Kahului Airport on Maui registered 13.6 inches between Wednesday and Saturday. This four-day total exceeded the airport's entire rainfall accumulation for the year 2025, underscoring the severity of the storm.

On Friday, March 14, Honolulu experienced 5.51 inches of rain, breaking a previous daily record established in 1951. Concurrently, Lihue on Kauai recorded 5.47 inches, more than doubling its single-day record from 2006.

Widespread Disruptions and Outlook

The heavy rainfall led to significant infrastructure challenges, including road closures and disruptions to essential services. The isolation of various communities posed immediate logistical problems for emergency responders and residents alike.

Power outages affected a substantial portion of the population, impacting both residential and commercial sectors. Restoration efforts were complicated by the ongoing severe weather conditions and widespread flooding.

Forecasters anticipate an additional 6 inches of rain for the Big Island through Monday, March 17, 2026. This continued precipitation suggests that the region will face ongoing challenges related to water management and potential further flooding in the immediate future.

Understanding Kona Low Systems

Kona low systems are a type of extratropical cyclone that typically form northwest of the Hawaiian Islands. Unlike typical trade wind patterns, these systems bring winds from the southwest, or "kona" direction, which is Hawaiian for leeward. This shift in wind direction allows moisture to be drawn from the warmer equatorial regions, leading to prolonged periods of heavy rainfall, particularly on the leeward sides of the islands which are usually drier.

These weather phenomena are known for their slow movement and can persist for several days, leading to cumulative rainfall totals that often exceed the capacity of local drainage systems. The intensity and duration of this particular Kona low underscore the vulnerability of island infrastructure to extreme weather events, a concern amplified by broader climate trends.

Implications

Country Impact: The extensive flooding and infrastructure damage in Hawaii will necessitate significant recovery efforts and potentially impact local tourism, a key economic driver for the state. Federal disaster assistance may be required to support rebuilding.

Industry Impact: The tourism and hospitality sectors in Hawaii are likely to experience short-term disruptions due to travel advisories and damaged infrastructure. Insurance companies may face increased claims related to property damage and business interruptions.

Market Impact: Local Hawaiian markets could see temporary downturns in sectors directly affected by the storm, such as retail and services. Construction and infrastructure repair companies may see increased demand in the aftermath.