Today | Weather | Saturday, May 16, 2026

Weather in Norwalk, California

01:46 PM
Now
Cloudy Weather
72° F
Feels Like 79°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 8
Humidity 56 %
Today
Cloudy Weather
Day 73°
Night 59°
Precipitation 3 %
Wind 8 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Norwalk Weather Forecast Updated

3 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 16, 2025)
Cloudy Weather

Day

72°

Night

59°

Wind

6 mph

UV Index

11

Precipitation

1 %

Air Quality in Norwalk

NOW
48 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.06 µg/m³
PM10 18.89 µg/m³
O3 0.052 ppm
NO2 0.1 ppb
SO2 0.3 ppb
CO 0.11 ppm
NH3 0.06 µg/m³
NO 0.04 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)
PM2.56.06 µg/m³
PM1018.89 µg/m³
O3101.21 µg/m³
NO20.18 µg/m³
SO20.67 µg/m³
CO122.2 µg/m³
NH30.06 µg/m³
NO0.04 µg/m³