Kahului, Hawaii climate: Normal weather by month, frost dates and records
Kahului's normal year runs from 64°F January nights to 90°F August afternoons, with 16.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 25.1°C, January lows of 18°C, August highs of 32°C, 412 mm of precipitation a year.
- NOAA stationKahului Airport
- Station IDUSW00022516
- Location20.90°N 156.43°W
- Elevation51 ft (16 m)
- From the center3 miles
- Population (census place)27,068
On October 23, the normal high in Kahului is 88°F and the normal low 70°F, and the chance of measurable rain or snow is 23%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Kahului.
- Jan 82° 64°
- Feb 82° 64°
- Mar 83° 65°
- Apr 85° 67°
- May 87° 68°
- Jun 88° 70°
- Jul 89° 72°
- Aug 90° 72°
- Sep 90° 71°
- Oct 89° 70°
- Nov 86° 68°
- Dec 83° 66°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Kahului each month?
August is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 64°F. The most precipitation falls in December (2.80 in), the least in June (0.17 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 82°F | 64°F | 72.9°F | 2.42 | 8 | <1 | <1 | 11 h |
| February | 82°F | 64°F | 73.0°F | 2.00 | 9 | <1 | <1 | 11 h 30 min |
| March | 83°F | 65°F | 74.0°F | 2.64 | 10 | <1 | <1 | 12 h |
| April | 85°F | 67°F | 75.5°F | 1.32 | 9 | <1 | <1 | 12 h 40 min |
| May | 87°F | 68°F | 77.1°F | 0.71 | 6 | 2 | <1 | 13 h 10 min |
| June | 88°F | 70°F | 79.3°F | 0.17 | 5 | 3 | <1 | 13 h 20 min |
| July | 89°F | 72°F | 80.5°F | 0.53 | 8 | 7 | <1 | 13 h 20 min |
| August | 90°F | 72°F | 81.1°F | 0.53 | 7 | 9 | <1 | 12 h 50 min |
| September | 90°F | 71°F | 80.6°F | 0.45 | 5 | 10 | <1 | 12 h 20 min |
| October | 89°F | 70°F | 79.4°F | 0.83 | 7 | 7 | <1 | 11 h 40 min |
| November | 86°F | 68°F | 77.1°F | 1.81 | 9 | 2 | <1 | 11 h 10 min |
| December | 83°F | 66°F | 74.6°F | 2.80 | 10 | <1 | <1 | 10 h 50 min |
| Year (annual) | 86°F | 68°F | 77.1°F | 16.21 | 93 | 39 | <1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 28°C | 18°C | 22.7°C | 61 mm |
| February | 28°C | 18°C | 22.8°C | 51 mm |
| March | 28°C | 18°C | 23.3°C | 67 mm |
| April | 29°C | 19°C | 24.2°C | 34 mm |
| May | 30°C | 20°C | 25.1°C | 18 mm |
| June | 31°C | 21°C | 26.3°C | 4 mm |
| July | 32°C | 22°C | 26.9°C | 13 mm |
| August | 32°C | 22°C | 27.3°C | 13 mm |
| September | 32°C | 22°C | 27.0°C | 11 mm |
| October | 32°C | 21°C | 26.3°C | 21 mm |
| November | 30°C | 20°C | 25.1°C | 46 mm |
| December | 29°C | 19°C | 23.7°C | 71 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00022516; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Kahului?
Normal highs sit between 65°F and 85°F in January, February, March, April and December. Of those, January has the fewest days with rain (8).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00022516.
How hot and how cold does it get in Kahului?
In a normal year in Kahului, 39 days a year reach 90°F, nights almost never fall to freezing and 93 days bring measurable precipitation.
- Days at 90°F or more
- 39a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- fewer than 1a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 93a normal year
The highest temperature in Kahului's official record (kept by the National Weather Service since 1954) is 97°F, on July 29, 2019; the lowest is 48°F, on January 20, 1969.
The wettest calendar year on that record is 1989, with 40.63 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00022516; records: ACIS (NOAA Regional Climate Centers), NWS threaded record OGGthr. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Kahului, and how clear are its skies?
The summer (June-August) dew point averages 68°F. The muggiest month is August, with an average dew point of 68°F, above the 65°F at which most people call the air sticky; the driest air comes in February (62°F). July is the windiest month (14.8 mph on average), and December has the most clear or nearly clear hours (58%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 63°F | 74% | 61% | 10.6 mph | 55% | 9% |
| February | 62°F | 72% | 58% | 11.0 mph | 51% | 8% |
| March | 64°F | 72% | 60% | 12.3 mph | 51% | 9% |
| April | 64°F | 70% | 57% | 12.2 mph | 48% | 10% |
| May | 66°F | 69% | 56% | 13.1 mph | 54% | 4% |
| June | 67°F | 68% | 55% | 14.5 mph | 50% | 4% |
| July | 68°F | 69% | 55% | 14.8 mph | 51% | 5% |
| August | 68°F | 69% | 56% | 13.6 mph | 52% | 6% |
| September | 68°F | 70% | 56% | 11.8 mph | 55% | 5% |
| October | 67°F | 72% | 59% | 11.1 mph | 56% | 6% |
| November | 65°F | 73% | 61% | 11.6 mph | 54% | 10% |
| December | 63°F | 74% | 61% | 10.4 mph | 58% | 8% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00022516. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Kahului?
Over a year 86% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Kahului, 5.8 kWh per square metre a day. August is the sunniest month (88%) and March the cloudiest (81%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 85% | 4.5 |
| February | 84% | 5.1 |
| March | 81% | 5.6 |
| April | 85% | 6.5 |
| May | 87% | 6.8 |
| June | 87% | 7.0 |
| July | 88% | 7.0 |
| August | 88% | 6.8 |
| September | 88% | 6.3 |
| October | 86% | 5.4 |
| November | 84% | 4.6 |
| December | 83% | 4.1 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Kahului need?
A normal year in Kahului brings 0 heating degree days, 100% fewer than the median U.S. place (5,373), and 4,423 cooling degree days, 4.9 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 9,898 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 0 | 245 |
| February | 0 | 224 |
| March | 0 | 279 |
| April | 0 | 317 |
| May | 0 | 375 |
| June | 0 | 429 |
| July | 0 | 481 |
| August | 0 | 499 |
| September | 0 | 468 |
| October | 0 | 446 |
| November | 0 | 363 |
| December | 0 | 298 |
| Year (annual) | 0 | 4,423 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00022516. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Kahului been warmer than normal lately?
2023 averaged 76.7°F, 0.4°F below the 1991-2020 normal of 77.1°F. 1 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.5°F | −0.6°F | 23.76 |
| 2022 | 78.1°F | +1.0°F | 6.69 |
| 2023 | 76.7°F | −0.4°F | 11.57 |
Over 54 complete years from 1955 to 2025, the station's annual mean temperature rose at a fitted 4.0°F per century (+0.22°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00022516; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Kahului's climate compare?
Kahului is warmer than 15 of the other 17 places with their own NOAA record in Hawaii, and wetter than 2. Across the 7,247 U.S. stations with normals, its annual mean of 77.1°F is warmer than 100%.
In the Köppen classification computed from these normals, Kahului is BSh: hot semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Kahului share this climate record?
7 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Wailuku, HI15,754 people · 5 mi W
- Waihee-Waiehu, HI11,369 people · 5 mi W
- Haiku-Pauwela, HI9,290 people · 8 mi E
- Waikapu, HI3,645 people · 8 mi SW
- Paia, HI2,629 people · 4 mi E
- Haliimaile, HI1,096 people · 7 mi E
- Maalaea, HI242 people · 8 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Kahului's climate
What is the coldest month in Kahului?
January, with a normal high of 82°F and a normal low of 64°F. The warmest is August (90°F by day, 72°F at night).
What is the rainiest month in Kahului?
December, with 2.80 in of precipitation in a normal year; the driest is June with 0.17 in.
What plant hardiness zone is Kahului in?
The USDA's 2023 map puts Kahului in zone 12b in ZIP code 96732. By the same method at Kahului's NOAA station, the coldest night of a typical year reaches 54°F (30 years, 1991-2020): zone 12a.
Nearby and next
- Kahului in OctoberThis month day by day, its records and recent years
- Hawaii climateThe statewide normals and every place in the state
- Kula, HI12 miles from this station, 63.9°F a year
- Kula Hospital 267, HI14 miles from this station, 62.9°F a year
- Haleakala Ranger Station 338, HI15 miles from this station, 54.5°F a year
- Puukolii 457.1, HI16 miles from this station, 74.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made