Today | Weather | Tuesday, April 21, 2026

Weather in Norwalk, California

04:26 PM
Now
Partly Sunny with Showers
66° F
Feels Like 64°
Precipitation 54 %
Wind 9 mph
UV Index (0 - 11+) 2
Humidity 67 %
Today
Partly Sunny with Showers
Day 68°
Night 55°
Precipitation 55 %
Wind 7 mph
UV Index (0 - 11+) 3

Norwalk Weather Forecast Updated

36 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 21, 2025)
Cloudy Weather

Day

73°

Night

55°

Wind

6 mph

UV Index

9

Precipitation

0 %

Air Quality in Norwalk

NOW
41 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.32 µg/m³
PM10 2.6 µg/m³
O3 0.044 ppm
NO2 0 ppb
SO2 0.1 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0.01 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)
PM2.51.32 µg/m³
PM102.6 µg/m³
O386.96 µg/m³
NO20.09 µg/m³
SO20.21 µg/m³
CO122.72 µg/m³
NH30 µg/m³
NO0.01 µg/m³