CLARKSVILLE, TN (CLARKSVILLE NOW) – The heat index in Clarksville today is expected to be between 109 and 114 today, and the National Weather Service has issued a Heat Advisory.

The advisory is in effect from 11 a.m. to 8 p.m., and it may be extended to Friday as well. This is the second day for the heat advisory.

Hot temperatures, with natural highs in the mid-90s, combined with high humidity may cause heat illnesses to occur.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances,” the NWS said.

“Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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 911.”

Clarksville forecast

Here’s the day-by-day outlook.

Today: Mostly sunny in the morning then becoming partly cloudy. Highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index readings 109 to 114.

Tonight: Partly cloudy. Lows in the mid 70s. Southwest winds around 5 mph. Heat index readings 96 to 101 early in the evening.

Friday: Partly cloudy in the morning then becoming partly sunny. A 50 percent chance of showers and thunderstorms. Highs in the lower 90s. Southwest winds 5 to 10 mph. Heat index readings 105 to 107.

Friday night: Mostly cloudy with a 40 percent chance of showers and thunderstorms. Lows around 70. West winds up to 5 mph shifting to the north after midnight.

Saturday: Mostly cloudy with a 40 percent chance of showers and thunderstorms. Highs in the upper 80s. North winds up to 10 mph.

Saturday night: Partly cloudy. A 20 percent chance of showers and thunderstorms in the evening. Lows in the mid 60s.

Sunday: Partly cloudy. A 30 percent chance of showers and thunderstorms in the afternoon. Highs in the mid 80s.

Sunday night: Partly cloudy. A 20 percent chance of showers and thunderstorms after midnight. Lows in the upper 60s.

Monday: Partly cloudy in the morning then becoming partly sunny. A 50 percent chance of showers and thunderstorms. Highs in the mid 80s.

Monday night: Mostly cloudy. Lows in the upper 60s.

Tuesday: Partly sunny with a 40 percent chance of showers and thunderstorms. Highs in the mid 80s.

Tuesday night: Partly cloudy. A 20 percent chance of showers and thunderstorms after midnight. Lows in the upper 60s.

Wednesday: Partly cloudy with a 40 percent chance of showers and thunderstorms. Highs in the upper 80s.