Today | Weather | Thursday, December 4, 2025

Weather in Waterbury, Connecticut

04:30 AM
Now
Cloudy Night
30° F
Feels Like 27°
Precipitation 0 %
Wind 6 mph
Humidity 82 %
Today
Snowy Weather
Day 39°
Night
Precipitation 55 %
Wind 16 mph
UV Index (0 - 11+) 1

Waterbury Weather Forecast Updated

41 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 4, 2024)
Snowy Weather

Day

37°

Night

30°

Wind

14 mph

Precipitation

100 %

Air Quality in Waterbury

NOW
57 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 15.32 µg/m³
PM10 19.73 µg/m³
O3 0.020 ppm
NO2 13.5 ppb
SO2 3.5 ppb
CO 0.23 ppm
NH3 0.54 µg/m³
NO 0.03 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.515.32 µg/m³
PM1019.73 µg/m³
O338.99 µg/m³
NO225.48 µg/m³
SO29.3 µg/m³
CO265.55 µg/m³
NH30.54 µg/m³
NO0.03 µg/m³