Today | Weather | Friday, September 18, 2026

Weather in Port St. Lucie, Florida

07:41 PM
Now
Cloudy Weather
79° F
Feels Like 86°
Precipitation 45 %
Wind 5 mph
Humidity 86 %
Today
Stormy Weather
Day 84°
Night 72°
Precipitation 100 %
Wind 7 mph
UV Index (0 - 11+) 7

Port St. Lucie Weather Forecast Updated

58 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Cloudy Night

Day

82°

Night

73°

Wind

6 mph

Precipitation

49 %

Air Quality in Port St. Lucie

NOW
26 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.52 µg/m³
PM10 3.89 µg/m³
O3 0.028 ppm
NO2 3.3 ppb
SO2 0.2 ppb
CO 0.12 ppm
NH3 0.18 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)
PM2.53.52 µg/m³
PM103.89 µg/m³
O355.73 µg/m³
NO26.3 µg/m³
SO20.57 µg/m³
CO132.78 µg/m³
NH30.18 µg/m³
NO0 µg/m³