Good morning, East Tennessee!
As your local meteorologist, I’m rolling out the latest weather update for Friday, July 25, 2025. The heat is on, not just this weekend, but even more so next week as excessive heat is expected to take over. We’ve been feeling the warmth lately, but things are about to crank up a notch! This easy-to-grab blog dives deep into today’s forecast for Knoxville, Chattanooga, and the Great Smoky Mountains, then lays out the rest of the story in detail—so let’s jump in and get ready!
Today, Friday: Sizzing Start with Rising Heat
We’re starting off this morning with temps already in the upper 70s, and that muggy, heavy air is making its presence known as a strong ridge of high pressure settles in. It’s going to feel like wading through warm syrup, but the day will heat up fast. By lunchtime—temps are climbing into the upper 80s, and afternoon highs are set to hit the mid-90s, possibly tying or breaking some of our hottest marks this year. That heat index? It’s pushing well into the low 100s, and in spots like the southern and Sequatchie valleys, it could nudge toward 105°F, flirting with Heat Advisory levels. It’s a day to take it slow—stay hydrated, seek shade, and don’t forget sunscreen because the UV Index will likely soar to 10 or 11, meaning you could burn in under 15 minutes without protection. Rain chances are practically zilch today, thanks to that dominating ridge locking out any storm potential. If a stray cloud drifts by, it’ll be a rare sight. Keep the eastTNweather app handy—its Interactive Radar offers past, current, and future views, just in case—download it now!
The Rest of the Story: Thursday and Beyond
Looking ahead, Thursday and Friday will carry that same high-pressure vibe, with temps holding in the low 90s and heat index values hovering around the low 100s. The pattern won’t shift much, and rain chances will stay low, with maybe an isolated shower or two if a disturbance sneaks through. The muggy feel will persist, making it another warm stretch—perfect for water activities if you can beat the heat.
As we roll into the weekend—Saturday, July 26, and Sunday, July 27—the ridge weakens a bit, but high pressure still calls the shots. A couple of disturbances will move to our north on the north side of that ridge, likely bringing a little more rain than we’ve seen. I don’t think we’re looking at a deluge, though—expect scattered showers and storms, maybe with slightly better coverage, but nothing to cancel plans over. Highs will stay in the low 90s, with the heat index near 100°F, keeping that summer stickiness alive. Use the app to stay updated as these could pop up quickly.
Next week, another ridge builds in, cranking up the heat even more. Highs will push into the mid-90s, and that heat index could edge close to Heat Advisory criteria, nearing 105°F if it peaks. With less precipitable water and drier air settling in, the chance for storms drops, leaving us with just those classic summertime afternoon showers—mostly isolated, with the best action along the Cumberland Plateau and Smoky Mountains. The Climate Prediction Center backs this up, forecasting sustained heat with average to slightly above-average rainfall—yep, it’s summer, y’all! For Knoxville locals, Chattanooga outdoor fans, and Smoky Mountain visitors, this helps you plan and stay safe.
ABOVE AND BEYOND THE 7 DAY FORECAST
Extended Outlook: More Heat, Average Rain Chances
Beyond the 7-day forecast, the pattern looks to hold steady with above-average heat and near-normal rain chancesaccording to the latest guidance from the Weather Prediction Center. So we may not get a ton of relief from the heat anytime soon — but at least we’re not trending bone-dry.
The Rest of the Story: Saturday and Sunday
Looking ahead, Saturday, July 26, will keep this heat wave rolling. That ridge will hold strong, pushing highs into the mid-90s, with the heat index lingering around 100-104°F across the region. The humidity will stick around, turning it into a steam bath, especially in lower areas. Rain remains a long shot, with only a faint chance of an isolated afternoon shower if a weak disturbance slips through—most likely along the Cumberland Plateau or Smoky Mountains where a bit of lift might trigger it. It’s not a total dry spell, but don’t expect much relief.
Sunday, July 27, might hint at a slight shift as the ridge weakens just a tad. Highs will still sit in the mid-90s, with the heat index near 100-102°F, but a whisper of a disturbance could bring a bit more cloud cover and a slight uptick in rain chances—think scattered showers rather than storms. It won’t cool things down significantly, but it might offer a brief break from the relentless sun. Stay tuned with the app for updates.
The Rest of the Forecast: Next Week and Beyond
Next week, the heat cranks up to excessive levels as that ridge strengthens into a heat dome. Highs will climb into the upper 90s, possibly touching 98-100°F by midweek, with the heat index soaring past 105°F and potentially hitting 108-110°F in some areas—definitely Heat Advisory or even Warning territory. The dry air under this ridge will squash storm chances, limiting us to rare, isolated afternoon showers, mostly along the higher elevations like the Smokies and Plateau where a bit of lift might spark a sprinkle. The Climate Prediction Center warns this heat could be the most intense of the year, with rainfall dropping well below average unless a surprise front breaks through—which looks unlikely for now. We’re in for a brutal stretch of sweltering, mostly dry days.
Looking further out, toward late July and early August, the ridge might start to wane as we approach the end of the month. This could allow a gradual return of more typical summer weather, with average rainfall creeping back in via scattered afternoon storms. The heat won’t vanish overnight—highs will likely hold in the low to mid-90s—but humidity might ease slightly, dropping the heat index closer to 100°F. No major cool fronts are on the radar yet, so we’re still in that peak East Tennessee summer mode. For Knoxville locals, Chattanooga outdoor fans, and Smoky Mountain visitors, this means prioritizing heat safety, sticking to water-based activities, and planning indoor time during peak heat.