30-year climate normals

Maui County Climate and Weather Averages

Hottest month — September

90.0°

average daily high. The coldest month is January, averaging a low of 63.6°F.

Maui County gets 16.21" of precipitation a year, and 45% of it falls in Dec, Jan, Feb.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	82.2°	63.6°	2.42"
February	82.2°	63.8°	2.00"
March	82.9°	65.1°	2.64"
April	84.5°	66.6°	1.32"
May	86.5°	67.7°	0.71"
June	88.3°	70.3°	0.17"
July	89.2°	71.8°	0.53"
August	89.9°	72.3°	0.53"
September	90.0°	71.2°	0.45"
October	88.7°	70.1°	0.83"
November	85.8°	68.4°	1.81"
December	83.3°	65.9°	2.80"

Rainfall by month

Maui County has a distinct wet season. 45% of the year's precipitation arrives in Dec, Jan, Feb.

January 2.42"

February 2.00"

March 2.64"

April 1.32"

May 0.71"

June 0.17"

July 0.53"

August 0.53"

September 0.45"

October 0.83"

November 1.81"

December 2.80"

Annual total 16.21"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 4,423

Heating degree days How much heating the climate demands 0

Approximate annual cooling cost At 52¢/kWh, Hawaii average $2,300

Approximate annual electric heating cost Lower where heating is gas rather than electric $0

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Maui County, where electricity is one line of eight.

Common questions

What is the weather like in Maui County?

Maui County averages a high of 90.0°F in September and a low of 63.6°F in January. Annual precipitation is 16.21 inches, with essentially no snow.

When is the rainy season in Maui County?

The wettest stretch is Dec, Jan, Feb, which accounts for 45% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Maui County?

The average daily high in September, the hottest month, is 90.0°F. That drives 4,423 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Maui County?

Effectively no. Measurable snowfall is rare in Maui County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station KAHULUI AP, HI US (USW00022516), 11.6 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Hawaii residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.