Today | Weather | Friday, December 12, 2025
Active Weather Warnings

Weather in Downey, California

08:54 PM
Now
Night
59° F
Feels Like 59°
Precipitation 0 %
Wind 4 mph
Humidity 78 %
Today
Cloudy Night
Day 72°
Night 52°
Precipitation 0 %
Wind 4 mph

Downey Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 12, 2024)
Cloudy Night

Day

61°

Night

48°

Wind

4 mph

Precipitation

1 %

Air Quality in Downey

NOW
111 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 39.74 µg/m³
PM10 48.24 µg/m³
O3 0.047 ppm
NO2 0.4 ppb
SO2 0.2 ppb
CO 0.21 ppm
NH3 0.02 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:

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

Show raw pollutant concentrations (µg/m³)
PM2.539.74 µg/m³
PM1048.24 µg/m³
O391.79 µg/m³
NO20.72 µg/m³
SO20.65 µg/m³
CO244.36 µg/m³
NH30.02 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Downey

Air Quality Alert

Air Quality Alert issued December 12 at 12:45PM PST by NWS Los Angeles/Oxnard CA
Dec 12, 12:45 PM 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 to midnight.

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, 7:34 PM Source: NWS Alert