Today | Weather | Monday, April 27, 2026

Weather in Stamford, Connecticut

04:37 PM
Now
Cloudy Weather
64° F
Feels Like 66°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 3
Humidity 40 %
Today
Sunny Weather
Day 66°
Night 45°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 8

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.

Stamford Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 27, 2025)
Cloudy Weather

Day

59°

Night

48°

Wind

19 mph

UV Index

5

Precipitation

40 %

Air Quality in Stamford

NOW
151 AQI
Unhealthy air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 22.88 µg/m³
PM10 25.96 µg/m³
O3 0.085 ppm
NO2 2.6 ppb
SO2 1.1 ppb
CO 0.19 ppm
NH3 0.43 µg/m³
NO 0.58 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:

Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.

Show raw pollutant concentrations (µg/m³)
PM2.522.88 µg/m³
PM1025.96 µg/m³
O3167.53 µg/m³
NO24.81 µg/m³
SO22.84 µg/m³
CO217.36 µg/m³
NH30.43 µg/m³
NO0.58 µg/m³