Mililani Town has some of the mildest winter nights among U.S. towns
In July the day’s top temperature is typically 82°. Precipitation peaks in December and eases off in August. Its yearly precipitation tops that of almost every U.S. town. Long walks are most pleasant from January to December, when afternoons reach 76–83°.
A year in Mililani Town at a glance
Each month’s typical high and low, and what it brings.
What stands out about Mililani Town’s climate
Compared with towns across the U.S., with Mililani Town’s place in Hawaii beside it.
What a year in Mililani Town feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Frost is rare
Frost and day counts come from NOAA’s station at Upper Wahiawa 874.3, HI, 4 miles from the town’s center, 380 ft higher.
The 2023 USDA map puts Mililani Town’s center in zone 12a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 53°. Plant labels use the zone; frost dates tell you when to plant.
About 64 inches of rain a year
December is the wettest month and August the driest. Rain falls on about 237 days a year. Snow is rare: about 0.0" in a normal year at Upper Wahiawa 874.3, HI, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Mililani Town
0% of the work is heating, so air conditioning is the bigger bill. No month averages under 55°.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Upper Wahiawa 874.3, HI.
Living with Mililani Town’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 12a. Frost almost never comes, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, May, June, July, August, September, October, November and December. 1.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Mililani Town from natural hazards, river flooding is the largest share (89%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Mililani Town and similar climates
TownRatings has no climate map of the towns around Mililani Town yet.
Climates most like Mililani Town’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Mililani Town, HI | 61° | 82° | 64" | 0.0" |
| Key Biscayne, FL | 62° | 89° | 61" | 0.0" |
| Cut Off, LA | 46° | 90° | 63" | 0.0" |
| Galveston, TX | 48° | 89° | 52" | 0.1" |
| Gulf Shores, AL | 44° | 90° | 62" | 0.0" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
How Mililani Town compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Mililani Town’s place among Hawaii’s.
Mililani Town weather by month
Highs, lows and precipitation from the nearest NOAA station; snow, wet days and snow on the ground from Upper Wahiawa 874.3, HI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground |
|---|---|---|---|---|---|---|
| January | 76° | 61° | 5.2" | 0.0" | 17 | 0 |
| February | 76° | 60° | 4.3" | 0.0" | 15 | 0 |
| March | 77° | 62° | 6.3" | 0.0" | 17 | 0 |
| April | 77° | 63° | 5.6" | 0.0" | 22 | 0 |
| May | 79° | 65° | 4.3" | 0.0" | 18 | 0 |
| June | 80° | 67° | 4.2" | 0.0" | 22 | 0 |
| July | 82° | 67° | 5.2" | 0.0" | 23 | 0 |
| August | 83° | 68° | 4.0" | 0.0" | 20 | 0 |
| September | 83° | 67° | 4.6" | 0.0" | 19 | 0 |
| October | 82° | 66° | 5.8" | 0.0" | 22 | 0 |
| November | 79° | 65° | 7.1" | 0.0" | 22 | 0 |
| December | 77° | 63° | 7.5" | 0.0" | 20 | 0 |
| Year | 79° | 64° | 64.1" | 0.0" | 237 | 0 |
Where Mililani Town’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s 1991–2020 normals at the nearest station (NOAA’s grid doesn’t cover Hawaii).
- Snow: Upper Wahiawa 874.3, HI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Upper Wahiawa 874.3, HI, 4 miles from the town’s center, 380 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Mililani Town’s climate
What is the weather like in Mililani Town?
A typical July afternoon reaches 82°, a January night drops to 61°, and snow is almost unheard of. Milder January nights than all but 89 U.S. towns; cooler July afternoons than 84% of U.S. towns.
How cold does it get in Mililani Town in winter?
February nights average 60°. A night at 32° or below comes in only some winters (0.0 a year on average).
How much snow does Mililani Town get?
About 0.0 inches in a normal winter at Upper Wahiawa 874.3, HI, so most winters see none.
How hot does it get in Mililani Town?
July, with a typical high of 82°. 90° days are rare: none in a normal year at Upper Wahiawa 874.3, HI.
When is the first and last frost in Mililani Town?
Most years have no frost at all: a 32° night comes in about 0% of winters at Upper Wahiawa 874.3, HI, usually in December or January.
What growing zone is Mililani Town in?
Zone 12a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 53°.
What is the best time of year to visit Mililani Town?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, May, June, July, August, September, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Neighbors talk weather
Gardens, snow, and the best days of the year in Mililani Town.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.