Today | Weather | Monday, July 20, 2026

Weather in Portsmouth, Virginia

05:29 PM
Now
Cloudy Weather
81° F
Feels Like 88°
Precipitation 49 %
Wind 9 mph
UV Index (0 - 11+) 2
Humidity 77 %
Today
Sunny with a Chance of Thunderstorms
Day 84°
Night 73°
Precipitation 100 %
Wind 8 mph
UV Index (0 - 11+) 5

Portsmouth Weather Forecast Updated

1 minute ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 20, 2025)
Cloudy Night

Day

93°

Night

77°

Wind

6 mph

Precipitation

14 %

Air Quality in Portsmouth

NOW
20 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.55 µg/m³
PM10 2.8 µg/m³
O3 0.022 ppm
NO2 1 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0.51 µg/m³
NO 0.13 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)
PM2.52.55 µg/m³
PM102.8 µg/m³
O342.92 µg/m³
NO21.94 µg/m³
SO20.46 µg/m³
CO129.8 µg/m³
NH30.51 µg/m³
NO0.13 µg/m³