Today | Weather | Thursday, May 21, 2026

Weather in New Haven, Connecticut

01:07 AM
Now
Cloudy Weather
64° F
Feels Like 63°
Precipitation 30 %
Wind 7 mph
Humidity 68 %
Today
Rainy Weather
Day 63°
Night 50°
Precipitation 84 %
Wind 7 mph
UV Index (0 - 11+) 3

New Haven Weather Forecast Updated

26 minutes 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
21 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.67 µg/m³
PM10 4.82 µg/m³
O3 0.022 ppm
NO2 9.3 ppb
SO2 0.9 ppb
CO 0.16 ppm
NH3 0.31 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)
PM2.53.67 µg/m³
PM104.82 µg/m³
O343.63 µg/m³
NO217.43 µg/m³
SO22.24 µg/m³
CO187.78 µg/m³
NH30.31 µg/m³
NO0 µg/m³