Today | Weather | Thursday, May 21, 2026

Weather in New Haven, Connecticut

11:19 AM
Now
Rainy Weather
61° F
Feels Like 55°
Precipitation 62 %
Wind 8 mph
UV Index (0 - 11+) 2
Humidity 72 %
Today
Rainy Weather
Day 63°
Night 52°
Precipitation 96 %
Wind 8 mph
UV Index (0 - 11+) 3

New Haven Weather Forecast Updated

1 minute ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 21, 2025)
Rainy Weather

Day

55°

Night

48°

Wind

12 mph

UV Index

2

Precipitation

90 %

Air Quality in New Haven

NOW
28 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.61 µg/m³
PM10 4.38 µg/m³
O3 0.030 ppm
NO2 7.8 ppb
SO2 1.3 ppb
CO 0.15 ppm
NH3 0.88 µg/m³
NO 2.49 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)
PM2.52.61 µg/m³
PM104.38 µg/m³
O358.46 µg/m³
NO214.77 µg/m³
SO23.29 µg/m³
CO168.76 µg/m³
NH30.88 µg/m³
NO2.49 µg/m³