Today | Weather | Wednesday, March 18, 2026

Weather in Rochester, New Hampshire

03:07 AM
Now
Night
23° F
Feels Like 12°
Precipitation 0 %
Wind 9 mph
Humidity 38 %
Today
Cloudy Weather
Day 34°
Night 19°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 4
Overnight Frost 6 AM – 8 AM
Tomorrow Morning Frost 12 AM – 7 AM

Rochester Weather Forecast Updated

Last updated on

Air Quality in Rochester

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.56 µg/m³
PM10 0.97 µg/m³
O3 0.049 ppm
NO2 1.6 ppb
SO2 0.2 ppb
CO 0.14 ppm
NH3 0.22 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)
PM2.50.56 µg/m³
PM100.97 µg/m³
O396.04 µg/m³
NO23.09 µg/m³
SO20.63 µg/m³
CO165.55 µg/m³
NH30.22 µg/m³
NO0 µg/m³