Historical weather data, all-time temperature records, and monthly climate averages for Waimalu, HI. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Waimalu typically brings a warm, pleasant day with an average high of 82° and a low of 69°. There's a 27% chance of rain — not unusual for windward Oahu — but snow has never once been recorded here on this date across 85 years of data. The range of outcomes is pretty tight: the hottest this day has ever reached was 87° in 1996, and the coldest low was 59° back in 1985.
Waimalu's all-time temperature record of 95° set on August 31, 2019 shows just how narrow this island's heat extremes really are — most mainland cities would shrug at that. The coldest it's ever gotten here was 52° in January 1969, meaning the entire recorded temperature range spans less than 45 degrees. The real drama is in rainfall: a single day in March 1958 dropped a staggering 15.32 inches.
Waimalu is warm year-round, with average highs staying between 80° in January and 88° at the late-summer peak in late July through September. If you're chasing the warmest weather, aim for late July; if you want slightly cooler and drier conditions, January and February are your best bet. Rain peaks around mid-to-late December, so holiday travelers should pack accordingly.