Today | Weather | Tuesday, April 7, 2026
Active Weather Warnings

Weather in Waipahu, Hawaii

03:45 AM
Now
Cloudy Night
68° F
Feels Like 68°
Precipitation 0 %
Wind 4 mph
Humidity 88 %
Today
Partly Sunny with Showers
Day 81°
Night 64°
Precipitation 65 %
Wind 8 mph
UV Index (0 - 11+) 4

Waipahu Weather Forecast Updated

58 minutes ago
Last updated on

Air Quality in Waipahu

NOW
33 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.14 µg/m³
PM10 10.34 µg/m³
O3 0.035 ppm
NO2 0 ppb
SO2 0.5 ppb
CO 0.10 ppm
NH3 0 µg/m³
NO 0 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.55.14 µg/m³
PM1010.34 µg/m³
O369.13 µg/m³
NO20.09 µg/m³
SO21.44 µg/m³
CO109.33 µg/m³
NH30 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Waipahu

Unknown Future Possible

Hydrologic Outlook

Hydrologic Outlook issued April 4 at 8:55AM HST by NWS Honolulu HI
Apr 4, 8:55 AM Apr 7, 6:00 PM
ESFHFO

Southerly winds associated with low pressure developing northwest of
the islands will draw a very moist tropical airmass northward early
next week. This will bring periods of heavy rain and a risk of flash
flooding. The most likely period for significant impacts is
Wednesday night through Thursday night. However, afternoon shower
development over island interiors on Tuesday may be heavy as well.
The duration of flooding potential remains less certain than usual
as deep moisture remains over the state into the middle of April
leading to potential for additional waves of heavy rain next weekend
or beyond.

Now would be a good time to clear storm drains, culverts, and other
drainage areas of debris to help reduce localized flooding.

This outlook will be updated daily or sooner if needed.

Stay up to date with the latest forecast information through
weather.gov/hawaii, local media, social media, or NOAA Weather Radio
broadcasts.
Updated: Apr 7, 2:46 AM Source: NWS Alert