Today | Weather | Monday, September 21, 2026

Weather in Concord, California

03:46 PM
Now
Sunny Weather
75° F
Feels Like 73°
Precipitation 0 %
Wind 14 mph
UV Index (0 - 11+) 3
Humidity 48 %
Today
Cloudy Weather
Day 75°
Night 57°
Precipitation 1 %
Wind 14 mph
UV Index (0 - 11+) 5

Concord Weather Forecast Updated

3 minutes ago
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
42 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.8 µg/m³
PM10 14.22 µg/m³
O3 0.046 ppm
NO2 0.5 ppb
SO2 0.3 ppb
CO 0.10 ppm
NH3 0.01 µg/m³
NO 0.07 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)
PM2.53.8 µg/m³
PM1014.22 µg/m³
O390.06 µg/m³
NO20.87 µg/m³
SO20.76 µg/m³
CO119.82 µg/m³
NH30.01 µg/m³
NO0.07 µg/m³