Today | Weather | Monday, July 20, 2026

Weather in Danbury, Connecticut

05:27 PM
Now
Cloudy Weather
79° F
Feels Like 81°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 3
Humidity 40 %
Today
Cloudy Weather
Day 79°
Night 61°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Danbury Weather Forecast Updated

9 minutes ago
Last updated on

Air Quality in Danbury

NOW
112 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 10.34 µg/m³
PM10 11.44 µg/m³
O3 0.074 ppm
NO2 1.2 ppb
SO2 0.7 ppb
CO 0.11 ppm
NH3 0.26 µg/m³
NO 0.27 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:

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Show raw pollutant concentrations (µg/m³)
PM2.510.34 µg/m³
PM1011.44 µg/m³
O3144.51 µg/m³
NO22.31 µg/m³
SO21.89 µg/m³
CO127.37 µg/m³
NH30.26 µg/m³
NO0.27 µg/m³