Today | Weather | Monday, September 21, 2026

Weather in Concord, California

06:43 PM
Now
Cloudy Weather
68° F
Feels Like 64°
Precipitation 0 %
Wind 12 mph
UV Index (0 - 11+) 0
Humidity 59 %
Today
Cloudy Weather
Day 73°
Night 57°
Precipitation 1 %
Wind 14 mph
UV Index (0 - 11+) 5

Concord Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Night

Day

88°

Night

61°

Wind

4 mph

Precipitation

0 %

Air Quality in Concord

NOW
43 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.74 µg/m³
PM10 14.68 µg/m³
O3 0.047 ppm
NO2 0.4 ppb
SO2 0.3 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)
PM2.53.74 µg/m³
PM1014.68 µg/m³
O392.15 µg/m³
NO20.79 µg/m³
SO20.75 µg/m³
CO118.29 µg/m³
NH30 µg/m³
NO0 µg/m³