Wailuku, HI climate
Wailuku has warm winters and warm summers, with very little rain. A typical July afternoon reaches 89°, a January night drops to 64°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Wailuku feels like
Winter
Spring
Summer
Fall
Wailuku weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground |
|---|---|---|---|---|---|---|
| January | 82° | 64° | 2.4" | 0 | 11 | 0 |
| February | 82° | 64° | 2.0" | 0 | 11 | 0 |
| March | 83° | 65° | 2.6" | 0 | 13 | 0 |
| April | 85° | 67° | 1.3" | 0 | 11 | 0 |
| May | 87° | 68° | 0.7" | 0 | 10 | 0 |
| June | 88° | 70° | 0.2" | 0 | 8 | 0 |
| July | 89° | 72° | 0.5" | 0 | 11 | 0 |
| August | 90° | 72° | 0.5" | 0 | 11 | 0 |
| September | 90° | 71° | 0.5" | 0 | 10 | 0 |
| October | 89° | 70° | 0.8" | 0 | 11 | 0 |
| November | 86° | 68° | 1.8" | 0 | 13 | 0 |
| December | 83° | 66° | 2.8" | 0 | 13 | 0 |
| Year | 86° | 68° | 16.2" | 0.0" | 134 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more.
Rain and snow in Wailuku
Wailuku gets 16 inches of rain and melted snow a year. December is the wettest month and June the driest. Rain or snow falls on about 134 days a year.
A year-round growing season
Heating and cooling a home in Wailuku
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Wailuku, 0% of that work is heating and 100% is cooling, so air conditioning is the bigger bill.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Wailuku and its neighbors
Wailuku borders 3 towns with climate data. January nights across them vary by 0.0°. Waihee-Waiehu has both the coldest January nights (64°) and the hottest July afternoons (89°). Wailuku’s January low is 64° and its July high 89°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Wailuku compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Common questions about Wailuku’s climate
What is the coldest month in Wailuku?
January, with a typical high of 82° and a low of 64°.
What is the hottest month in Wailuku?
September, with a typical high of 90° and a low of 71°. About 39 days a year reach 90°.
How much snow does Wailuku get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Wailuku?
Frost is uncommon. Only 0% of years see a night at 32° or below.
What is the rainiest month in Wailuku?
December, with 2.8 inches of rain and melted snow. The year totals 16 inches.
NOAA’s gridded normals don’t cover this state, so temperatures and rainfall come from the nearest weather station. Snow, frost dates and day counts come from NOAA’s weather station at Waiehu Camp 484, HI (2 mi, snow) and Kahului Airport, HI (5 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020.