This weather has a price Keeping the median Hawaii County home comfortable runs roughly $1,143 a year in heating and cooling alone. See where it lands in the monthly bill

30-year climate normals

Hawaii County Climate and Weather Averages

Hottest month: June

57.6°

average daily high. The coldest month is February, averaging a low of 34.3°F.

Hawaii County gets 14.3" of precipitation a year, and 32% of it falls in Aug, Sep, Oct.

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	51.1°	35.4°	1.10"
February	50.1°	34.3°	1.04"
March	50.5°	34.8°	1.94"
April	53.1°	36.5°	0.87"
May	55.5°	39.3°	0.60"
June	57.6°	41.1°	0.43"
July	57.5°	40.7°	1.27"
August	57.3°	40.7°	2.38"
September	56.5°	40.6°	0.67"
October	55.8°	39.6°	1.47"
November	52.4°	37.2°	1.21"
December	51.1°	35.8°	1.32"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 32% falling in the wettest three months (Aug, Sep, Oct).

January 1.10"

February 1.04"

March 1.94"

April 0.87"

May 0.60"

June 0.43"

July 1.27"

August 2.38"

September 0.67"

October 1.47"

November 1.21"

December 1.32"

Annual total 14.3"

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 0

Heating degree days How much heating the climate demands 6,919

Approximate annual cooling cost At 47.18¢/kWh, Hawaii average $0

Approximate annual electric heating cost Lower where heating is gas rather than electric $1,143

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 Hawaii County, where electricity is one line of eight.

Common questions

What is the weather like in Hawaii County?

Hawaii County averages a high of 57.6°F in June and a low of 34.3°F in February. Annual precipitation is 14.3 inches, with essentially no snow.

When is the rainy season in Hawaii County?

The wettest stretch is Aug, Sep, Oct, which accounts for 32% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Hawaii County?

The average daily high in June, the hottest month, is 57.6°F. That drives 0 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Hawaii County?

The weather station used for Hawaii County, MAUNA LOA 5 NNE, HI US, reports temperature and precipitation but not snowfall, so there is no snow normal to quote here. Precipitation that falls as snow is still counted in the 14.3 inches above, measured as melted water.

Sources

Temperature, precipitation and snowfall normals: NOAA National Centers for Environmental Information, 1991 to 2020 Monthly Climate Normals, station MAUNA LOA 5 NNE, HI US (USW00021514), 6.5 miles from the county centroid.
Heating and cooling degree days: NOAA, same station and period.
Annual figures on this page are the sum of that station's twelve monthly normals. NOAA also publishes a separately-computed annual normal, which can differ from the monthly sum by a few percent; we use the monthly series because the month-by-month breakdown above has to come from it.
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.