Today | Weather | Monday, September 1, 2025

Heat Advisory (Issued when high temperatures and humidity create conditions that may be hazardous during outdoor activity or prolonged exposure.)

Weather in Norwalk, California

08:05 AM

Now

66° F

Feels Like 70°

Precipitation 0 %

Wind 4 mph

UV Index (0 - 11+) 11

Humidity 93 %

Today

Day 93°

Night 72°

Precipitation 0 %

Wind 7 mph

UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Other:

Very warm with plenty of bright sunlight.

Norwalk Weather Forecast Updated

40 minutes ago

Last updated on September 01, 2025 7:24 AM

Air quality in Norwalk

NOW

62 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 27.78 µg/m³

PM10 28.96 µg/m³

O₃ 10.75 ppb

NO₂ 22.62 ppb

SO₂ 4.10 ppb

CO 349.19 ppb

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

View Hourly Air Quality Forecast