Honolulu averages 23.8 days a year above 90°F, with March the wettest month at 3.18 in of normal rain. The hottest day on record was 97°F on Sep 24, 2019; the coldest, 43°F on Jan 18, 2009. The single biggest 24-hour rain event recorded was 6.12 in on Oct 31, 1978.
Climate and Average Weather Year Round in Honolulu
Year-round temperature
In Honolulu, the warmest months are July through October, with average daily highs between 87°F and 88°F. The coldest stretch runs January through March, with highs near 81°F and overnight lows reaching 66°F.
Rainfall through the year
Rainfall in Honolulu averages 1.7 in per month over the long run. March is the wettest at 3.2 in, while June is the driest at 0.6 in.
Days at 90 °F or hotter
Honolulu averages 23.8 days per year at 90 °F or hotter. The hottest year on record saw 77 such days (2004); the coolest just 1 (1988).