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Weather Blogs / WeatherMatrix

Hawaii's long March of heavy rain

Published Mar 15, 2021 7:01 PM EDT | Updated Jun 21, 2021 5:53 PM EDT

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March 2021 was a long month for Hawaii. You can see every tweet I did on the Hawaii rainfall in this month's WeatherMatrix Newsletter on Revue.

Of course, it rains a lot in Hawaii, but limited areas see over 20 inches (blues on the map below) in a normal March:

Average March Rainfall in Hawaii

Average March Rainfall in Hawaii

Univ. Hawaii Manoa

In March 2021, most of the airports (except Honolulu) got close to, or over 10 inches of rain:

  • Hilo Airport: 24.99"

  • Lihue Airport: 11.89"

  • Kahului Airport: 9.78" (their record wettest March is only 10.90")

All told, the top 3 USGS station rainfall totals for the month of March 2021 were:

  • 111.71" at Mt. Waialeale near Lihue, HI

  • 50.38" at West Wailuaki near Keanae, HI

  • 46.77" at Puu Kukui near Maui

Top 3 March 2021 Rainfall (Hawaii)

Top 3 March 2021 Rainfall Amounts (Hawaii)

(USGS)

It started out with snow on the first day of Meteorological Spring.

First day of Meteorological #Spring is cold and icy with snow on the ground at Mauna Kea & Mauna Loa, Hawaii #hiwx Webcams: https://t.co/qNuTb0VA72 pic.twitter.com/kGElvf32Fn

— Jesse Ferrell (AccuWeather) (@WeatherMatrix) March 1, 2021

By March 10, 2 to 3 feet of rain had fallen in several locations in as many days.

MAP: 72-hour rainfall amounts over 7" for Hawaii (doesn't have every station but coverage is impressive)!

+ Radar storm totals, list of 5-day totals: #hiwx

Mt. Waialele: 34.68"
Kilohana: 27.65
Wahiawa: 23.89
Keanae: 22.97
Hanalei: 20.70
N Wailua Ditch: 19.27 pic.twitter.com/dBLEeRRZrz

— Jesse Ferrell (AccuWeather) (@WeatherMatrix) March 10, 2021

Even after that, the rain continued. Check out all the tweets I sent about the Hawaii rainfall in this month's WeatherMatrix Newsletter on Revue.

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