Today | Weather | Monday, April 27, 2026

Weather in Norwalk, Connecticut

05:58 PM
Now
Cloudy Weather
63° F
Feels Like 61°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 2
Humidity 45 %
Today
Sunny Weather
Day 66°
Night 43°
Precipitation 0 %
Wind 7 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

Last updated on

Air Quality in Norwalk

NOW
132 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 18.56 µg/m³
PM10 21.21 µg/m³
O3 0.080 ppm
NO2 2.8 ppb
SO2 0.9 ppb
CO 0.18 ppm
NH3 0.46 µg/m³
NO 0.47 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:

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Show raw pollutant concentrations (µg/m³)
PM2.518.56 µg/m³
PM1021.21 µg/m³
O3156.1 µg/m³
NO25.18 µg/m³
SO22.41 µg/m³
CO208.33 µg/m³
NH30.46 µg/m³
NO0.47 µg/m³