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Weather & Climate in Waipahu, HI

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Waipahu has a warm climate with an average annual temperature of 77°F (25°C). Winters average 73°F in January while summers reach 80°F in July / relatively mild seasonal variation. The area gets 330 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 13.9 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 24 / among the cleanest air in the country. The city sits at an elevation of 10 feet.

Temperature

73°F Jan (23°C) 80°F Jul (27°C)
Annual Average77.0°F
43% above US avg
January Average73°F (23°C)
July Average80°F (27°C)
Sunny Days330 days/yr

Geography

Elevation10 ft (3 m)
Area2.8 sq mi (7.2 km²)
Population Density14,877/sq mi
Coordinates21.3849°N, 158.0110°W
TimezonePacific/Honolulu
CountyHonolulu County County
Nearest AirportDaniel K Inouye International (HNL)
7 miles away

Precipitation & Snow

Annual Rainfall 13.9"
63% below US avg
Wettest Month (Jan) 8.07"
Driest Month (Jun) 1.89"

Air Quality

AQI Median24.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively High
Risk Score98.8 / 100
Social Vulnerability25.9 / 100
Community Resilience62.6 / 100

Hazard Breakdown

Tornado Relatively Low
Hurricane Relatively Low
Earthquake Relatively High
Wildfire Relatively High
Flood Very High
Hail Very Low
Strong Wind Very Low
Heat Wave No Rating
Winter Weather No Rating
Lightning Very High
Ice Storm Relatively Moderate
Drought Very Low
Cold Wave No Rating
Landslide Relatively High
Coastal Flood Relatively Moderate
Tsunami Relatively High
Volcano No Rating
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

60 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.

Mar 9, 2017 70 km NNE of Kualapu‘u, Hawaii M4.7 126 km 32 km
Jun 21, 2013 49 km N of Kualapu‘u, Hawaii M4.5 107 km 35 km
Aug 22, 2014 54 km SW of Maunaloa, Hawaii M4.2 79 km 6 km
May 20, 2005 28 km ENE of Ka‘a‘awa, Hawaii M4.1 53 km 10 km
Jun 7, 2014 5 km ESE of Maunaloa, Hawaii M4.1 92 km 0 km
Jun 1, 2006 66 km N of Kualapu‘u, Hawaii M4.1 113 km 31 km
Oct 23, 1991 29 km NW of Maunaloa, Hawaii M4.0 65 km 23 km
Jul 19, 2010 37 km S of Honolulu, Hawaii M3.9 48 km 3 km
Aug 15, 2002 Oahu region, Hawaii M3.9 43 km 5 km
Jun 14, 1991 24 km NNE of Kualapu‘u, Hawaii M3.8 112 km 4 km
May 29, 2014 56 km NNW of Kualapu‘u, Hawaii M3.8 95 km 30 km
Jul 29, 2013 11 km ESE of Waim?nalo Beach, Hawaii M3.7 44 km 33 km
Feb 25, 2011 27 km SSE of East Honolulu, Hawaii M3.7 55 km 0 km
Sep 16, 2017 34 km NE of Marine Corps Base Hawaii - MCBH, Hawaii M3.7 61 km 10 km
Apr 9, 1993 16 km WNW of Lanai City, Hawaii M3.6 112 km 1 km
Jun 15, 2013 122 km WSW of Ko Olina, Hawaii M3.6 136 km 17 km
Jun 4, 2018 13 km S of East Honolulu, Hawaii M3.6 40 km 32 km
Apr 30, 1993 31 km N of Kualapu‘u, Hawaii M3.5 104 km 15 km
Aug 23, 2017 24 km NNE of Waialua, Hawaii M3.5 142 km 13 km
May 21, 2011 118 km SW of Lanai City, Hawaii M3.5 143 km 16 km
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Hurricane History

6 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.

Year Name Category Max Wind Closest
2020 Douglas Category 1 92 mph 100 km
2018 Lane Category 1 75 mph 277 km
2016 Lester Category 1 75 mph 242 km
2014 Ana Category 1 81 mph 181 km
1992 Iniki Category 4 144 mph 186 km
1982 Iwa Category 1 92 mph 211 km
Source: NOAA IBTrACS (Category 1+, 1980-2026).

Tornado History

21 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 2 injuries.

Date Rating Distance Path Fatalities
Mar 18, 1982 EF2 13 km 0.1 mi 0
Feb 11, 1982 EF2 31 km 0.1 mi 0
Feb 11, 1982 EF2 25 km 0.1 mi 0
Mar 26, 1988 EF1 10 km 0.2 mi 0
Jun 15, 1971 EF1 12 km 0.5 mi 0
Jan 28, 1971 EF1 13 km 1.7 mi 0
Mar 28, 1963 EF1 33 km 0.1 mi 0
Mar 1, 1963 EF1 10 km 0.1 mi 0
Jan 21, 1957 EF1 16 km 2.5 mi 0
Apr 23, 2015 EF0 8 km 1.0 mi 0
Mar 9, 2012 EF0 31 km 1.3 mi 0
Feb 11, 2009 EF0 7 km 0.4 mi 0
Dec 4, 2005 EF0 97 km 0.1 mi 0
Feb 7, 2004 EF0 94 km 1.0 mi 0
Jan 25, 2004 EF0 4 km 1.0 mi 0
Feb 11, 1989 EF0 13 km 0.2 mi 0
May 13, 1986 EF0 4 km 0.2 mi 0
Sep 26, 1985 EF0 33 km 0.1 mi 0
Sep 23, 1983 EF0 10 km 0.1 mi 0
Nov 26, 1975 EF0 15 km 1.5 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).

Nearby Volcanoes

1 volcano within 200 km. Closest: Haleakala (198 km).

Name Type Elevation Last Eruption Distance
Haleakala Shield 3,055 m (10,023 ft) 1750 198 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

1 wildfire (100+ acres) recorded within 100 km. Largest: MILILANI (1,717 acres, 2023).

Year Name Acres Burned Distance
2023 MILILANI 1,717 13 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 73°F (23°C) 8.1 in Wettest
February 70°F (21°C) 4.4 in Coldest
March 71°F (22°C) 5.6 in
April 72°F (22°C) 4.8 in
May 74°F (23°C) 3.3 in
June 76°F (24°C) 1.9 in Driest
July 80°F (27°C) 2.4 in Warmest
August 78°F (25°C) 2.6 in
September 77°F (25°C) 2.2 in
October 76°F (24°C) 5.2 in
November 74°F (23°C) 6.1 in
December 72°F (22°C) 5.9 in

Waipahu has a seasonal temperature swing of 10°F / from 70°F in February to 80°F in July. Total annual precipitation is 52.4 inches, with January being the wettest month (8.1") and June the driest (1.9").

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