Today | Weather | Monday, July 20, 2026

Weather in Waterbury, Connecticut

07:42 PM
Now
Cloudy Weather
72° F
Feels Like 70°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 0
Humidity 61 %
Today
Cloudy Night
Day 82°
Night 59°
Precipitation 3 %
Wind 6 mph

Waterbury Weather Forecast Updated

34 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 20, 2025)
Stormy Weather

Day

88°

Night

64°

Wind

13 mph

Precipitation

86 %

Air Quality in Waterbury

NOW
81 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 9.07 µg/m³
PM10 10.69 µg/m³
O3 0.064 ppm
NO2 3.9 ppb
SO2 1.1 ppb
CO 0.13 ppm
NH3 0.45 µg/m³
NO 0.09 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)
PM2.59.07 µg/m³
PM1010.69 µg/m³
O3125.49 µg/m³
NO27.29 µg/m³
SO22.98 µg/m³
CO145.34 µg/m³
NH30.45 µg/m³
NO0.09 µg/m³