Today | Weather | Monday, April 27, 2026

Weather in Danbury, Connecticut

05:58 PM
Now
Sunny Weather
64° F
Feels Like 64°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 2
Humidity 37 %
Today
Sunny Weather
Day 70°
Night 37°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 8
Overnight Frost 7 AM – 7 AM

Warning: High UV Index Today: 8

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

Last updated on

Air Quality in Danbury

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

Pollutant Concentrations:

PM2.5 22.26 µg/m³
PM10 25.38 µg/m³
O3 0.083 ppm
NO2 3.7 ppb
SO2 1.1 ppb
CO 0.20 ppm
NH3 0.62 µg/m³
NO 0.62 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)
PM2.522.26 µg/m³
PM1025.38 µg/m³
O3162.54 µg/m³
NO27 µg/m³
SO22.9 µg/m³
CO229.22 µg/m³
NH30.62 µg/m³
NO0.62 µg/m³