Today | Weather | Wednesday, May 20, 2026

Weather in Rochester, New Hampshire

05:53 PM
Now
Cloudy Weather
84° F
Feels Like 82°
Precipitation 34 %
Wind 12 mph
UV Index (0 - 11+) 2
Humidity 42 %
Today
Sunny with a Chance of Thunderstorms
Day 86°
Night 54°
Precipitation 55 %
Wind 9 mph
UV Index (0 - 11+) 6

Rochester Weather Forecast Updated

Last updated on

Air Quality in Rochester

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.92 µg/m³
PM10 2.08 µg/m³
O3 0.037 ppm
NO2 2.2 ppb
SO2 0.1 ppb
CO 0.13 ppm
NH3 0.27 µg/m³
NO 0.29 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)
PM2.51.92 µg/m³
PM102.08 µg/m³
O372.31 µg/m³
NO24.17 µg/m³
SO20.38 µg/m³
CO143.48 µg/m³
NH30.27 µg/m³
NO0.29 µg/m³