Today | Weather | Saturday, September 19, 2026

Weather in Waterbury, Connecticut

08:28 AM
Now
Cloudy Weather
55° F
Feels Like 55°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 1
Humidity 60 %
Today
Cloudy Weather
Day 70°
Night 54°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 5

Waterbury Weather Forecast Updated

52 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 19, 2025)
Night

Day

79°

Night

48°

Wind

7 mph

Precipitation

0 %

Air Quality in Waterbury

NOW
28 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.61 µg/m³
PM10 3.6 µg/m³
O3 0.030 ppm
NO2 4 ppb
SO2 0.9 ppb
CO 0.17 ppm
NH3 0.57 µg/m³
NO 0.23 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)
PM2.51.61 µg/m³
PM103.6 µg/m³
O358.82 µg/m³
NO27.58 µg/m³
SO22.39 µg/m³
CO199.01 µg/m³
NH30.57 µg/m³
NO0.23 µg/m³