Today | Weather | Wednesday, March 18, 2026

Weather in Waterbury, Connecticut

12:21 PM
Now
Cloudy Weather
30° F
Feels Like 36°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 4
Humidity 36 %
Today
Cloudy Weather
Day 36°
Night 21°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 5
Overnight Frost 12 AM – 6 AM
Tomorrow Morning Frost 3 AM – 6 AM

Waterbury Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Sunny Weather

Day

63°

Night

32°

Wind

11 mph

UV Index

5

Precipitation

0 %

Air Quality in Waterbury

NOW
43 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.78 µg/m³
PM10 6.42 µg/m³
O3 0.046 ppm
NO2 8.2 ppb
SO2 1.9 ppb
CO 0.19 ppm
NH3 1 µg/m³
NO 4.75 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)
PM2.53.78 µg/m³
PM106.42 µg/m³
O390.12 µg/m³
NO215.46 µg/m³
SO25.07 µg/m³
CO215.83 µg/m³
NH31 µg/m³
NO4.75 µg/m³