Today | Weather | Friday, September 18, 2026

Weather in Stamford, Connecticut

10:59 AM
Now
Cloudy Weather
75° F
Feels Like 81°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 4
Humidity 67 %
Today
Cloudy Weather
Day 82°
Night 55°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 5

Stamford Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Night

Day

82°

Night

63°

Wind

6 mph

Precipitation

1 %

Air Quality in Stamford

NOW
53 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 13.51 µg/m³
PM10 15.85 µg/m³
O3 0.029 ppm
NO2 7.1 ppb
SO2 1.7 ppb
CO 0.22 ppm
NH3 0.47 µg/m³
NO 4.57 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.513.51 µg/m³
PM1015.85 µg/m³
O356.99 µg/m³
NO213.4 µg/m³
SO24.36 µg/m³
CO248.21 µg/m³
NH30.47 µg/m³
NO4.57 µg/m³