Today | Weather | Friday, September 18, 2026

Weather in Tracy, California

07:54 PM
Now
Night
79° F
Feels Like 75°
Precipitation 0 %
Wind 8 mph
Humidity 42 %
Today
Night
Day 84°
Night 55°
Precipitation 0 %
Wind 5 mph

Tracy Weather Forecast Updated

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

Day

90°

Night

66°

Wind

6 mph

Precipitation

96 %

Air Quality in Tracy

NOW
42 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 7.13 µg/m³
PM10 17.35 µg/m³
O3 0.045 ppm
NO2 0.8 ppb
SO2 0.3 ppb
CO 0.14 ppm
NH3 0.01 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)
PM2.57.13 µg/m³
PM1017.35 µg/m³
O388.59 µg/m³
NO21.57 µg/m³
SO20.78 µg/m³
CO161.75 µg/m³
NH30.01 µg/m³
NO0 µg/m³