Update, 9 a.m. Wednesday: The high reached 97 degrees at 4 p.m. Tuesday, with a heat index of 105.

CLARKSVILLE, TN (CLARKSVILLE NOW) – With temperatures near 100 and heat indexes up to 109 degrees expected this week, a Heat Advisory has been issued for Montgomery and surrounding counties.

The advisory from the National Weather Service is in effect from 11 a.m. Wednesday through 8 p.m. Friday.

“Hot temperatures and high humidity may cause heat illnesses,” the NWS said. “Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.”

| MORE: What’s a heat index? Your guide to hot weather warnings

Clarksville forecast

Here’s the day-by-day outlook.

  • Today: Sunny and hot, with a high near 97. Heat index values as high as 106. West southwest wind around 5 mph becoming calm.
  • Tonight: Mostly clear, with a low around 74. Calm wind.
  • Wednesday: Sunny and hot, with a high near 98. Heat index values as high as 107. Calm wind.
  • Wednesday night: Clear, with a low around 74. Calm wind.
  • Thursday: Sunny and hot, with a high near 98. Calm wind becoming south around 5 mph.
  • Thursday night: Mostly clear, with a low around 75. Calm wind.
  • Friday: Sunny and hot, with a high near 97. Calm wind becoming south southeast around 5 mph.
  • Friday night: Mostly clear, with a low around 73. Calm wind.

| WEATHER UPDATES: Click here for seven-day and hour-by-hour Clarksville weather forecasts