Today | Weather | Wednesday, March 18, 2026

Weather in Portsmouth, Virginia

08:23 PM
Now
Night
39° F
Feels Like 36°
Precipitation 0 %
Wind 8 mph
Humidity 53 %
Today
Cloudy Weather
Day 41°
Night 36°
Precipitation 1 %
Wind 9 mph
UV Index (0 - 11+) 5

Portsmouth Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Sunny Weather

Day

63°

Night

39°

Wind

12 mph

UV Index

5

Precipitation

0 %

Air Quality in Portsmouth

NOW
47 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.02 µg/m³
PM10 4.61 µg/m³
O3 0.051 ppm
NO2 2.2 ppb
SO2 0.4 ppb
CO 0.15 ppm
NH3 1.62 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)
PM2.53.02 µg/m³
PM104.61 µg/m³
O3100.23 µg/m³
NO24.18 µg/m³
SO20.92 µg/m³
CO172.73 µg/m³
NH31.62 µg/m³
NO0 µg/m³