Today | Weather | Friday, September 18, 2026

Weather in Concord, California

02:38 AM
Now
Night
57° F
Feels Like 55°
Precipitation 0 %
Wind 6 mph
Humidity 93 %
Today
Sunny Weather
Day 84°
Night 57°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 6

Concord Weather Forecast Updated

32 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Rainy Weather

Day

84°

Night

63°

Wind

6 mph

Precipitation

80 %

Air Quality in Concord

NOW
36 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.89 µg/m³
PM10 17.27 µg/m³
O3 0.039 ppm
NO2 0.7 ppb
SO2 0.3 ppb
CO 0.15 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)
PM2.56.89 µg/m³
PM1017.27 µg/m³
O376.49 µg/m³
NO21.32 µg/m³
SO20.71 µg/m³
CO168.86 µg/m³
NH30 µg/m³
NO0 µg/m³