Today | Weather | Saturday, August 29, 2026

Active Weather Warnings

Extreme Heat Warning

Weather in Chino Hills, California

01:56 AM

Now

75° F

Feels Like 75°

Precipitation 0 %

Wind 4 mph

Humidity 73 %

Today

Day 99°

Night 70°

Precipitation 2 %

Wind 9 mph

UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Chino Hills Weather Forecast Updated

47 minutes ago

Last updated on August 29, 2026 at 1:08 AM

Air Quality in Chino Hills

NOW

102 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 36.12 µg/m³

PM₁₀ 53.35 µg/m³

O₃ 0.047 ppm

NO₂ 0.6 ppb

SO₂ 0.2 ppb

CO 0.13 ppm

NH₃ 0.13 µg/m³

NO 0 µg/m³

PM_2.5 – 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:

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 36.12 µg/m³

PM₁₀ – 53.35 µg/m³

O₃ – 91.67 µg/m³

NO₂ – 1.04 µg/m³

SO₂ – 0.61 µg/m³

CO – 150.95 µg/m³

NH₃ – 0.13 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Chino Hills

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued August 28 at 9:06PM PDT until August 29 at 8:00PM PDT by NWS San Diego CA

Aug 28, 9:06 PM → Aug 29, 8:00 PM

WHAT: Hot conditions continue into Saturday with high temperatures
up to 103 degrees. Lows will be in the mid to upper 70s.

WHERE: San Bernardino and Riverside County Valleys-The Inland
Empire.

WHEN: Until 8 PM PDT Saturday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat events.

ADDITIONAL DETAILS: Temperatures will fall to below normal by
Sunday.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Updated: Aug 29, 1:08 AM Source: NWS Alert