Today | Weather | Friday, September 18, 2026

Weather in Livermore, California

07:54 PM
Now
Night
70° F
Feels Like 66°
Precipitation 0 %
Wind 6 mph
Humidity 59 %
Today
Cloudy Night
Day 81°
Night 55°
Precipitation 0 %
Wind 5 mph

Livermore Weather Forecast Updated

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

Day

81°

Night

63°

Wind

5 mph

Precipitation

55 %

Air Quality in Livermore

NOW
42 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.78 µg/m³
PM10 17.53 µg/m³
O3 0.045 ppm
NO2 0.6 ppb
SO2 0.3 ppb
CO 0.14 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)
PM2.56.78 µg/m³
PM1017.53 µg/m³
O389.29 µg/m³
NO21.04 µg/m³
SO20.81 µg/m³
CO157.78 µg/m³
NH30 µg/m³
NO0 µg/m³