Less & Heavy Rain

  • Hawai‘i is getting drier! Hawai‘i has seen an overall decline in rainfall over the past 30 years, with widely varying precipitation patterns on each island. The period since 2008 has been particularly dry. Stream flow in Hawai‘i has declined over approximately the past century, consistent with observed decreases in rainfall. This indicates declining groundwater levels and in-turn, the potential for drinking water shortages.
  • When we get rain, it is heavier. And that means more runoff, erosion, and flooding.
  • What’s coming? More frequent tropical cyclones are projected for the waters near Hawai‘i. This is not necessarily because there will be more storms forming in the east Pacific; but it is projected that storms will follow new tracks that bring them into the region of Hawai‘i more often.