Today | Weather | Monday, July 20, 2026

Weather in Stamford, Connecticut

04:32 PM
Now
Cloudy Weather
81° F
Feels Like 82°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 3
Humidity 42 %
Today
Sunny Weather
Day 82°
Night 66°
Precipitation 0 %
Wind 6 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.

Stamford Weather Forecast Updated

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

Day

88°

Night

68°

Wind

13 mph

Precipitation

40 %

Air Quality in Stamford

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

Pollutant Concentrations:

PM2.5 10.2 µg/m³
PM10 11.36 µg/m³
O3 0.071 ppm
NO2 1 ppb
SO2 0.6 ppb
CO 0.11 ppm
NH3 0.21 µg/m³
NO 0.22 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)
PM2.510.2 µg/m³
PM1011.36 µg/m³
O3139.82 µg/m³
NO21.84 µg/m³
SO21.68 µg/m³
CO129.91 µg/m³
NH30.21 µg/m³
NO0.22 µg/m³