Today | Weather | Friday, September 18, 2026

Weather in Largo, Florida

07:38 AM
Now
Cloudy Weather
72° F
Feels Like 75°
Precipitation 7 %
Wind 7 mph
UV Index (0 - 11+) 1
Humidity 98 %
Today
Stormy Weather
Day 91°
Night 73°
Precipitation 55 %
Wind 8 mph
UV Index (0 - 11+) 6

Largo Weather Forecast Updated

10 seconds ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Sunny with a Chance of Thunderstorms

Day

90°

Night

73°

Wind

6 mph

UV Index

80

Precipitation

55 %

Air Quality in Largo

NOW
38 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.6 µg/m³
PM10 4.43 µg/m³
O3 0.041 ppm
NO2 0.5 ppb
SO2 0.1 ppb
CO 0.12 ppm
NH3 0.03 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)
PM2.51.6 µg/m³
PM104.43 µg/m³
O380.07 µg/m³
NO20.95 µg/m³
SO20.37 µg/m³
CO142.64 µg/m³
NH30.03 µg/m³
NO0 µg/m³