Hourly Weather | Today Friday, December 12, 2025
Active Weather Warnings
Rancho Cucamonga, California
9 PM
Cloudy Night
61°
Feels Like 59°
40
Humidity: 44%
Wind: 6 mph
UV Index: 0
10 PM
Cloudy Night
61°
Feels Like 59°
17
Humidity: 68%
Wind: 6 mph
UV Index: 0
11 PM
Cloudy Night
59°
Feels Like 57°
17
Humidity: 63%
Wind: 5 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

9 PM
154 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 62.91 µg/m³
  • PM10: 69.07 µg/m³
  • O3: 0.046 ppm
  • NO2: 1.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.33 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

10 PM
155 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 65.12 µg/m³
  • PM10: 71.19 µg/m³
  • O3: 0.046 ppm
  • NO2: 1.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.34 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

11 PM
155 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 64.36 µg/m³
  • PM10: 70.26 µg/m³
  • O3: 0.046 ppm
  • NO2: 1.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.33 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

Weather Alerts and Warnings for Rancho Cucamonga

Air Quality Alert

Air Quality Alert issued December 12 at 11:54AM PST by NWS San Diego CA
Dec 12, 11:54 AM Dec 14, 12:00 AM
WHAT: The South Coast AQMD has issued a mandatory wood-burning
ban for residents in the South Coast Air Basin. The No-Burn rule
bans burning wood, pellets, and manufactured fire logs in any indoor
or outdoor wood-burning device.

WHERE: The South Coast Air Basin, which includes Orange County
and non-desert portions of Los Angeles, Riverside, and San
Bernardino counties. No-Burn Day alerts do not apply to areas above
3,000 feet in elevation, the Coachella Valley, or the High Desert.
Homes that rely on wood as a sole source of heat, low-income
households and those without natural gas service also are exempt
from the requirement.

WHEN: Midnight tonight to midnight Saturday night.

IMPACTS: Particles in smoke can get deep into the lungs and cause
health problems (including asthma attacks), increases in emergency
room visits, and hospitalizations. No-Burn Days are needed to
protect public health when fine particle pollution levels are
expected to be high anywhere in the South Coast Air Basin. No-Burn
Days are based on fine particle pollution levels that are forecasted
for an entire 24-hour period, which may not be reflected in
real-time air quality maps.
+ Read More
To protect your health, check current and forecasted air quality levels at www.aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. When air quality is poor in your area, limited extended or intense outdoor activity and remain inside with windows and doors closed. Run your air conditioner and/or an air purifier and avoid using devices that bring in outside air like a swamp cooler or whole house fan if you have other ways to stay cool. Additional details for this air quality alert are available at www.aqmd.gov/advisory. Information on the South Coast AQMD Check Before You Burn program is available at www.aqmd.gov/cbyb.
Updated: Dec 12, 7:52 PM Source: NWS Alert