Today | Weather | Saturday, April 4, 2026
Active Weather Warnings

Weather in Honolulu, Hawaii

10:35 PM
Now
Night
72° F
Feels Like 68°
Precipitation 0 %
Wind 9 mph
Humidity 73 %
Today
Cloudy Weather
Day 81°
Night 66°
Precipitation 8 %
Wind 13 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Honolulu Weather Forecast Updated

Air Quality in Honolulu

NOW
47 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.53 µg/m³
PM10 7.42 µg/m³
O3 0.050 ppm
NO2 0.1 ppb
SO2 0.1 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)
PM2.51.53 µg/m³
PM107.42 µg/m³
O398.81 µg/m³
NO20.2 µg/m³
SO20.24 µg/m³
CO116.5 µg/m³
NH30 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Honolulu

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 4, 9:46 PM Source: NWS Alert