Today | Weather | Friday, September 18, 2026

Weather in Antioch, California

02:40 AM
Now
Cloudy Night
61° F
Feels Like 57°
Precipitation 0 %
Wind 8 mph
Humidity 88 %
Today
Sunny Weather
Day 86°
Night 57°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 6

Antioch Weather Forecast Updated

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

Day

88°

Night

64°

Wind

6 mph

Precipitation

82 %

Air Quality in Antioch

NOW
35 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.61 µg/m³
PM10 15.07 µg/m³
O3 0.038 ppm
NO2 1.2 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)
PM2.56.61 µg/m³
PM1015.07 µg/m³
O374.41 µg/m³
NO22.27 µg/m³
SO20.76 µg/m³
CO176.14 µg/m³
NH30 µg/m³
NO0 µg/m³