Today | Weather | Saturday, September 19, 2026

Weather in Hartford, Connecticut

04:47 AM
Now
Cloudy Night
55° F
Feels Like 55°
Precipitation 0 %
Wind 6 mph
Humidity 72 %
Today
Cloudy Weather
Day 70°
Night 54°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 5

Hartford Weather Forecast Updated

2 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 19, 2025)
Night

Day

81°

Night

50°

Wind

6 mph

Precipitation

1 %

Air Quality in Hartford

NOW
29 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.5 µg/m³
PM10 2.99 µg/m³
O3 0.031 ppm
NO2 2.6 ppb
SO2 0.5 ppb
CO 0.16 ppm
NH3 0.38 µg/m³
NO 0 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.51.5 µg/m³
PM102.99 µg/m³
O360.64 µg/m³
NO24.8 µg/m³
SO21.43 µg/m³
CO181.48 µg/m³
NH30.38 µg/m³
NO0 µg/m³