Today | Weather | Friday, September 18, 2026
Active Weather Warnings

Weather in Clarksville, Tennessee

11:37 AM
Now
Cloudy Weather
97° F
Feels Like 104°
Precipitation 47 %
Wind 7 mph
UV Index (0 - 11+) 6
Humidity 40 %
Today
Sunny with a Chance of Thunderstorms
Day 100°
Night 72°
Precipitation 55 %
Wind 6 mph
UV Index (0 - 11+) 6

Clarksville Weather Forecast Updated

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

Day

93°

Night

63°

Wind

4 mph

Precipitation

0 %

Air Quality in Clarksville

NOW
48 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.8 µg/m³
PM10 5.39 µg/m³
O3 0.052 ppm
NO2 0.2 ppb
SO2 0.3 ppb
CO 0.11 ppm
NH3 0.3 µg/m³
NO 0.05 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)
PM2.54.8 µg/m³
PM105.39 µg/m³
O3101.89 µg/m³
NO20.39 µg/m³
SO20.74 µg/m³
CO121.76 µg/m³
NH30.3 µg/m³
NO0.05 µg/m³

Weather Alerts and Warnings for Clarksville

Moderate Expected Likely

Heat Advisory

Heat Advisory issued September 17 at 9:51PM CDT until September 20 at 7:00PM CDT by NWS Nashville TN
Sep 17, 9:51 PM Sep 20, 7:00 PM
WHAT: Heat index values up to 108 expected.

WHERE: Across Middle Tennessee.

WHEN: Until 7 PM CDT Sunday.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.
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Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Updated: Sep 18, 10:10 AM Source: NWS Alert