Today | Weather | Friday, October 31, 2025

Weather in Norwalk, California

12:34 AM

Now

61° F

Feels Like 63°

Precipitation 0 %

Wind 4 mph

Humidity 90 %

Today

Day 79°

Night 57°

Precipitation 0 %

Wind 6 mph

UV Index (0 - 11+) 4

Norwalk Weather Forecast Updated

56 minutes ago

Last updated on October 30, 2025 11:37 PM

Weather Forecast History

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

Day

73°

Night

48°

Wind

4 mph

UV Index

Precipitation

Air Quality in Norwalk

NOW

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 12.56 µg/m³

PM₁₀ 33.44 µg/m³

O₃ 0.042 ppm

NO₂ 0.3 ppb

SO₂ 0.3 ppb

CO 0.10 ppm

NH₃ 0 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 12.56 µg/m³

PM₁₀ – 33.44 µg/m³

O₃ – 81.61 µg/m³

NO₂ – 0.63 µg/m³

SO₂ – 0.74 µg/m³

CO – 109.88 µg/m³

NH₃ – 0 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast