Today | Weather | Thursday, May 21, 2026

Weather in Waterbury, Connecticut

11:20 AM
Now
Rainy Weather
59° F
Feels Like 59°
Precipitation 47 %
Wind 7 mph
UV Index (0 - 11+) 2
Humidity 68 %
Today
Rainy Weather
Day 63°
Night 46°
Precipitation 70 %
Wind 6 mph
UV Index (0 - 11+) 4

Waterbury Weather Forecast Updated

9 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 21, 2025)
Rainy Weather

Day

54°

Night

45°

Wind

11 mph

UV Index

2

Precipitation

90 %

Air Quality in Waterbury

NOW
26 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.72 µg/m³
PM10 4.59 µg/m³
O3 0.028 ppm
NO2 9.5 ppb
SO2 1.7 ppb
CO 0.16 ppm
NH3 1.07 µg/m³
NO 3.11 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)
PM2.52.72 µg/m³
PM104.59 µg/m³
O354.65 µg/m³
NO217.92 µg/m³
SO24.41 µg/m³
CO179.51 µg/m³
NH31.07 µg/m³
NO3.11 µg/m³