Waipahu, HI
Full City Profile · Hawaii · Honolulu County County
2.9
/5.0
C+
Fair
39,871
Population
14,877/sq mi density
$98,633
Median Income
$30,363 per capita
$835,400
Home Value
$863,950 Zillow
$1,585
Median Rent
31.0% income on rent
77°F
Avg Temperature
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
A
Economy
4.4 / 5.0
$98,633 median income, 4.2% unemployment
D
Affordability
1.9 / 5.0
$835,400 home value, $1,585/mo rent
C
Education
2.5 / 5.0
18.6% bachelor's degree or higher
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. Annual precipitation totals 13.9 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 31.
Temperature
73°F Jan (23°C)
80°F Jul (27°C)
| Annual Average | 77.0°F |
| 43% above US avg | |
| January Average | 73°F (23°C) |
| July Average | 80°F (27°C) |
Geography
| Elevation | 10 ft (3 m) |
| Area | 2.8 sq mi (7.2 km²) |
| Population Density | 14,877/sq mi |
| Coordinates | 21.3849°N, 158.0110°W |
| Timezone | Pacific/Honolulu |
| County | Honolulu County County |
| Nearest Airport | Daniel K Inouye International (HNL) 7 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 31.0 |
| Rating | Good |
| Good Days % | 98.4% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0275 ppm |
| NO₂ (Nitrogen Dioxide) | 6.1 ppb |
| SO₂ (Sulfur Dioxide) | 1.31 ppb |
| CO (Carbon Monoxide) | 0.11 ppm |
| PM2.5 (Fine Particles) | 4.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.8 / 100 |
| Social Vulnerability | 25.9 / 100 |
| Community Resilience | 62.6 / 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)
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). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 73°F (23°C) | 1.4 in | Coldest |
| February | 73°F (23°C) | 1.8 in | |
| March | 74°F (23°C) | 2.0 in | |
| April | 76°F (24°C) | 0.6 in | |
| May | 77°F (25°C) | 1.0 in | |
| June | 79°F (26°C) | 0.3 in | Driest |
| July | 80°F (27°C) | 0.3 in | |
| August | 81°F (27°C) | 0.6 in | Warmest |
| September | 81°F (27°C) | 0.7 in | |
| October | 80°F (26°C) | 1.3 in | |
| November | 77°F (25°C) | 1.8 in | |
| December | 75°F (24°C) | 2.3 in | Wettest |
Waipahu has a seasonal temperature swing of 8°F / from 73°F in January to 81°F in August. Total annual precipitation is 13.9 inches, with December being the wettest month (2.3") and June the driest (0.3").