NASHVILLE, Tennessee — Friday, June 20, 2025, 8:00 a.m. (ET) — A powerful heat dome is settling across Middle Tennessee, marking the official start of summer with the hottest temperatures of the year. This atmospheric phenomenon is expected to intensify over the coming days, bringing oppressive heat and dangerous humidity levels through at least Wednesday, June 25.
What is a heat dome and why it matters
The term ‘heat dome’ refers to a large, slow-moving ridge of high pressure that effectively traps heat near the surface. As the air sinks, it compresses and warms, resulting in hot, dry conditions. At the same time, this dome-like cap prevents cooler air from entering the region and keeps pollutants and moisture locked in place — leading to poor air quality and high dew points.
Scorching weekend forecast for Nashville and surrounding areas
Starting Saturday, June 21, daytime highs across Nashville, Murfreesboro, Clarksville, and Franklin are forecast to hit the mid to upper 90s°F (around 35–37°C). But the real-feel temperatures will soar even higher — reaching over 105°F (40.5°C) at times, especially during the peak afternoon hours.
This spell of intense, unrelenting heat is likely to continue until at least Thursday, June 26, as the high-pressure ridge remains firmly anchored over the eastern United States. By the middle of next week, temperatures may approach or even hit 100°F (37.8°C) across parts of Middle Tennessee.
Humidity will amplify the danger
Unlike the dry heat typical of desert regions, this event will bring a sweltering combination of heat and humidity. Thanks to previous heavy rains this year, the soil moisture and airborne humidity will remain high — making it feel hotter and more oppressive. Dew points are projected to stay in the upper 60s to low 70s°F (about 20–22°C), pushing the heat index well above the National Weather Service’s advisory thresholds.
First heat advisories of the year incoming
The National Weather Service is expected to issue official heat advisories beginning this weekend, with the possibility of excessive heat warnings if temperatures exceed current projections. Urban centers, such as downtown Nashville, are especially vulnerable due to the urban heat island effect, which retains warmth even after sunset.
Stay alert for further updates and always keep the News 2 Storm Tracker app handy for real-time weather alerts across Middle Tennessee.
