Kailua, HI climate
Kailua has warm winters and warm summers. A typical July afternoon reaches 84°, a January night drops to 65°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Kailua feels like
Winter
Spring
Summer
Fall
Kailua 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 | 78° | 65° | 4.8" | 0 | 16 | 0 |
| February | 78° | 65° | 4.5" | 0 | 13 | 0 |
| March | 79° | 67° | 5.4" | 0 | 15 | 0 |
| April | 80° | 69° | 3.3" | 0 | 13 | 0 |
| May | 81° | 70° | 2.4" | 0 | 12 | 0 |
| June | 83° | 73° | 1.3" | 0 | 11 | 0 |
| July | 84° | 74° | 1.9" | 0 | 15 | 0 |
| August | 85° | 74° | 2.0" | 0 | 13 | 0 |
| September | 85° | 74° | 2.6" | 0 | 13 | 0 |
| October | 84° | 73° | 3.5" | 0 | 14 | 0 |
| November | 82° | 71° | 5.4" | 0 | 16 | 0 |
| December | 79° | 68° | 5.5" | 0 | 19 | 0 |
| Year | 82° | 70° | 42.4" | 0.0" | 169 | 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 Kailua
Kailua gets 42 inches of rain and melted snow a year. December is the wettest month and June the driest. Rain or snow falls on about 169 days a year.
A year-round growing season
Heating and cooling a home in Kailua
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Kailua, 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.
Kailua and its neighbors
Kailua borders 4 towns with climate data. January nights across them vary by 5.0°. Maunawili has the coldest January nights (63°) and Waimanalo the hottest July afternoons (84°). Kailua’s January low is 65° and its July high 84°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Kailua compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Common questions about Kailua’s climate
What is the coldest month in Kailua?
January, with a typical high of 78° and a low of 65°.
What is the hottest month in Kailua?
September, with a typical high of 85° and a low of 74°.
How much snow does Kailua get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Kailua?
Frost is uncommon. Only 0% of years see a night at 32° or below.
What is the rainiest month in Kailua?
December, with 5.5 inches of rain and melted snow. The year totals 42 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 Waimanalo Exp F 795.1, HI (5 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020.