Happy Sunday, folks!
As your local meteorologist, I’m rolling out the latest weather update for Sunday, July 13, 2025.
Hope you can make it a fun day—let’s get to it! We kicked off with some patchy dense fog and temps on the warm side, sitting in the 70s. This easy-to-follow blog breaks it down day by day for Knoxville, Chattanooga, and the Great Smoky Mountains, so let’s dive in and plan your day!
Sunday: Warm Start with a Hot, Less Stormy Afternoon
We’re starting off warm with that foggy kick, and temps will jump to the 80s by lunchtime, hitting low 90s for highs. But watch out—that heat index will climb near or over 100°F for many, especially across the southern valley and Sequatchie valley, thanks to the sticky air. Rain chances are looking lighter than Saturday, which is great news if you’ve got outdoor plans! Just keep tabs on them with the eastTNweather app—it’s free to download and keeps you in the loop.
Monday: Hot and Muggy with Afternoon Storms
Monday, July 14, keeps the heat rolling. Highs will stay in the 90s, with the heat index pushing into the low 100s thanks to that muggy air. Expect some afternoon showers and storms to pop up, so plan your day and track them with the app. It’s a warm one, so stay cool!
Tuesday: More Heat and Storms
Tuesday, July 15, follows suit with highs in the 90s and a heat index near the low 100s. That muggy feel sticks around, and we’ll see more afternoon showers and storms. Nothing wild, but use the app to dodge any surprises and enjoy your day!
Wednesday: Stick Heat with More Storms
Wednesday, July 16, brings another hot day with highs in the 90s and a heat index in the low 100s. The humidity will keep things sticky, and afternoon showers and storms are on the menu. Keep the eastTNweather app handy to stay ahead of the weather.
Thursday: Staying Hot and Muggy with Afternoon Storms
Thursday, July 17, keeps the pattern going—highs in the 90s, heat index in the low 100s, and those afternoon showers and storms lingering. It’s a muggy week, so track it with the app and plan your outdoor time wisely.
Friday: Hot Week Wrap-Up with Yet Again, More Storms
Friday, July 18, wraps the week with highs in the 90s and a heat index near the low 100s. Afternoon showers and storms will stick around, keeping things interesting. Use the app to stay updated and make the most of it!
ABOVE AND BEYOND THE 7 DAY FORECAST
Looking past the 7 Day Forecast, the Climate Prediction Center has issues a forecast based on probabilities.
These maps don’t show you how far above or below, but rather an idea of how strong the signal is.
Why This Weather’s Happening
Here’s the story: High pressure is parked strong along the southeast coast, pumping in that humidity—our dew points are hanging in the 70s, making it feel thick. Our mid-level ridge along the Gulf coast is letting disturbances swing our way from the north side, while the upper-level ridge (that jet stream) is building and sticking with us all week. That’s what’s cranking up the heat. For Knoxville locals, Chattanooga outdoor fans, and Smoky Mountain visitors, this helps you plan and stay safe.
Your Weather Pal: The eastTNweather App
The eastTNweather app is your go-to for East Tennessee weather. Launched in October 2023 after 20 years at WBIR, it delivers three daily video forecasts, a live morning chat, and updates on MikeWitcherTV and ETNWeather. Free on Roku, Amazon Fire, eastTNweather.com, and the app, it’s packed with Interactive Radar to track rain. Download it today!
Stay Connected with eastTNweather
I’m here to keep you in the know and safe. Pop over to eastTNweather.com, grab the app, or follow me on social media for the latest on today’s heat and the week’s storms. Have a great Sunday, make it fun, and check back in—let’s roll with this summer weather!