Approaching Record Territory
Thursday, September 17, 2026 · 6:36 PM
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Very hot and humid conditions with triple digit heat indices continue. A Heat Advisory is in effect through Saturday for most of Middle Tennessee. Not as hot next week, but overall temperatures will stay above-normal for the foreseeable future. Low rain chances mainly for the Plateau this weekend. Low to medium rain chances areawide early to mid next week. The five hundred millibar high is pushing southwest! Ninety-nine degrees in Nashville, no time to rest! Looking back to eighteen ninety-six when the old record stood, Middle Tennessee is burning up the whole neighborhood! Heat indices rising, one hundred five to one hundred eight! Overnight lows in the seventies, locked at the gate! The ridge is holding strong, giving us no relief! Living through September in absolute disbelief! The heat advisory is locked in through Saturday night! The sun is beating down with all of its power and might! We are burning at ninety-nine, feeling the heat! Approaching record territory! West of the Plateau, low seventies in the dark! Sixties in the hills, but the daytime leaves a mark! Upper nineties running wild right into the weekend, A pop-up shower chance is a fake best friend! The heat advisory is locked in through Saturday night! The sun is beating down with all of its power and might! We are burning at ninety-nine, feeling the heat! Approaching record territory! Eight P.M. Saturday! Shift to the southwest! One hundred eight heat index! Approaching record territory! Approaching record territory!
The forecast discussion
KEY MESSAGES
Updated at 632 PM CDT Thu Sep 17 2026
- Very hot and humid conditions with triple digit heat indices continue.
A Heat Advisory is in effect through Saturday for most of Middle Tennessee.
- Not as hot next week, but overall temperatures will stay above- normal for the foreseeable future.
- Low rain chances mainly for the Plateau this weekend.
Low to medium rain chances areawide early to mid next week.
SHORT TERM
(Rest of today through Friday) Issued at 1047 AM CDT Thu Sep 17 2026
Heat continues to be the main story of the forecast as a very strong 500mb high makes just a slight movement to the southwest.
Highs today will once again approach record territory for Nashville (Current record: 99 set in 1896, today's forecast: 99).
A few spots across Middle TN could surpass 100 degrees this afternoon with heat indicies in the 105-108 range.
Highs will continue to run in the upper 90s into the weekend as the center of the ridge continues a gradual shift southwest.
Very low chance for a pop up shower each day, but most spots will remain dry through the weekend.
Heat Risk levels will remain elevated with the continued heat, so be sure to check on your people and take precautions to keep yourself cool and hydrated.
Overnight lows will be in the low to mid 70s west of the Plateau where 60s will be common.
LONG TERM
(Friday Night through next Thursday) Issued at 1047 AM CDT Thu Sep 17 2026
The Heat Advisory currently runs through 8 PM Saturday, though an extension into Sunday is not out of the question with highs remaining in the upper 90s.
The ridge will continue pulling back west, opening the door for more widespread rain chances to re- enter the forecast next week.
Chances are ranging between 30-50% areawide.
Temperatures will cool off into the upper 80s, but will still be above normal for this time of year.