Today | Weather | Friday, October 31, 2025

Weather in Concord, California

11:50 PM

Now

57° F

Feels Like 57°

Precipitation 0 %

Wind 5 mph

Humidity 84 %

Today

Day 79°

Night 52°

Precipitation 0 %

Wind 6 mph

UV Index (0 - 11+) 3

Concord Weather Forecast Updated

Last updated on October 31, 2025 10:45 PM

Weather Forecast History

Last Year's Weather on This Day (October 31, 2024)

Day

68°

Night

48°

Wind

8 mph

UV Index

Precipitation

Air Quality in Concord

NOW

36 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 4 µg/m³

PM₁₀ 11.2 µg/m³

O₃ 0.039 ppm

NO₂ 1.1 ppb

SO₂ 0.3 ppb

CO 0.09 ppm

NH₃ 0.02 µg/m³

NO 0 µg/m³

PM_2.5 – 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)

PM_2.5 – 4 µg/m³

PM₁₀ – 11.2 µg/m³

O₃ – 75.83 µg/m³

NO₂ – 1.99 µg/m³

SO₂ – 0.86 µg/m³

CO – 103.85 µg/m³

NH₃ – 0.02 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast