Today | Weather | Friday, September 18, 2026

Weather in St. Petersburg, Florida

05:41 AM
Now
Night
77° F
Feels Like 82°
Precipitation 5 %
Wind 12 mph
Humidity 90 %
Today
Stormy Weather
Day 90°
Night 77°
Precipitation 55 %
Wind 10 mph
UV Index (0 - 11+) 6

St. Petersburg Weather Forecast Updated

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

Day

88°

Night

75°

Wind

8 mph

Precipitation

80 %

Air Quality in St. Petersburg

NOW
38 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.63 µg/m³
PM10 4.52 µg/m³
O3 0.041 ppm
NO2 0.3 ppb
SO2 0.1 ppb
CO 0.13 ppm
NH3 0.05 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)
PM2.51.63 µg/m³
PM104.52 µg/m³
O380.35 µg/m³
NO20.62 µg/m³
SO20.31 µg/m³
CO143.69 µg/m³
NH30.05 µg/m³
NO0 µg/m³