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Today | Weather | Thursday, February 26, 2026
Active Weather Warnings

Weather in Norwalk, Connecticut

01:15 AM
Now
Cloudy Night
23° F
Feels Like 7°
Precipitation 7 %
Wind 15 mph
Humidity 81 %
Today
Cloudy Weather
Day 41°
Night 16°
Precipitation 25 %
Wind 7 mph
UV Index (0 - 11+) 2
FROST FORECAST
Overnight Frost 12 AM – 5 AM
Tomorrow Morning Frost 12 AM – 9 AM

Norwalk Weather Forecast Updated

2 minutes ago
Last updated on

Air Quality in Norwalk

NOW
39 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 9.27 µg/m³
PM10 11.63 µg/m³
O3 0.037 ppm
NO2 7.1 ppb
SO2 0.7 ppb
CO 0.21 ppm
NH3 0.38 µg/m³
NO 0 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)
PM2.5 – 9.27 µg/m³
PM10 – 11.63 µg/m³
O3 – 72.89 µg/m³
NO2 – 13.43 µg/m³
SO2 – 1.88 µg/m³
CO – 237.74 µg/m³
NH3 – 0.38 µg/m³
NO – 0 µg/m³
View Hourly Air Quality Forecast

Weather Alerts and Warnings for Norwalk

Moderate Expected Observed

Special Weather Statement

Special Weather Statement issued February 25 at 11:52PM EST by NWS Upton NY
Feb 25, 11:52 PM → Feb 26, 3:00 AM
Showers are currently moving through southern CT. This
precipitation is falling as freezing rain in some locations where
surface temperatures have dropped below freezing. A glaze of ice
is possible which could cause slick conditions.

Use caution if traveling tonight and leave extra room between you
and the car in front of you.
Updated: Feb 26, 1:13 AM Source: NWS Alert