Lani (Sky, Weather, Air, etc.).
Science on a Sphere (NOAA)
Hawaiian Moon Calendar (Kamehameha Publishing)
Monthly Star Chart (UH Institute for Astronomy)
Hawaiian Star Lines and Names of Stars (Polynesian Voyaging Society)
NASA (including Educational Resources here and here)
Weather forecast - Live (Windy)
Wind forecast - Live (Nullschool)
Honua (Land, Geology, Soil, Vegetation, Energy, Freshwater, etc.)
Hawaii Soil Atlas (UHM CTAHR)
Cultural GIS Resource (AVA Konohiki)
Georeferencer (overlay old maps to new ones)
Coastal Geology Resources (UHM SOEST)
Saving ʻŌhiʻa, Hawaiiʻs Sacred tree (Documentary with resources)
Alien Species in Hawaii, Distribution Map (UHM Botany)
Oahu Urban Garden Center (UHM CTAHR)
Kai (Ocean, Tides, Intertidal, etc.)
Surf & Swell Forecast (Magic Seaweed)
Nautical Charts (Deep Zoom)
Pacific Islands Ocean Observing System (PacIOOS)
Hawaii Ocean Time Series (UH-SOEST)
Hawaii Intertidal Data (OPIHI)
Intertidal Field Guide (OPIHI)
Reef Watcherʻs Field Guide to Alien and Native Hawaiian Marine Algae (UHM Botany)
Plankton Identification Key (free App for Apple iPads)
World Register of Marine Species (WoRMS)
Flora and Fauna of Hawaii and beyond (MarineLife Photography)