Today | Weather | Thursday, July 23, 2026

Weather in Rochester, New Hampshire

06:33 AM
Now
Sunny Weather
61° F
Feels Like 63°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 70 %
Today
Cloudy Weather
Day 81°
Night 50°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Rochester Weather Forecast Updated

28 minutes ago
Last updated on

Air Quality in Rochester

NOW
18 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.71 µg/m³
PM10 0.92 µg/m³
O3 0.019 ppm
NO2 2.1 ppb
SO2 0.2 ppb
CO 0.09 ppm
NH3 0.21 µg/m³
NO 0.28 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)
PM2.50.71 µg/m³
PM100.92 µg/m³
O337.37 µg/m³
NO23.97 µg/m³
SO20.54 µg/m³
CO103.88 µg/m³
NH30.21 µg/m³
NO0.28 µg/m³