KANSAS CITY, MISSOURI — The central and eastern US are about to go from summer to fall in a matter of days. The end of this never-ending heat dome is near, and by Tuesday, September 22, a powerful push of cooler air will send high temperatures plummeting across the Plains and East Coast compared to what residents are feeling today, Friday, September 18, according to a High Temperature Change forecast from Max Velocity. If you’re anywhere from Kansas City to Washington, D.C., this is the pattern shift you’ve been waiting for.
Kansas City and Omaha Face the Most Dramatic Cooldown in the Country
If you’re in Kansas City, brace for one of the sharpest temperature swings anywhere on the map: highs are forecast to plunge 25 degrees by Tuesday compared to today. Omaha isn’t far behind, with a projected drop of 24 degrees. These two cities represent the epicenter of this week’s cooldown, meaning residents across this stretch of the central Plains should expect Tuesday to feel like an entirely different season compared to the heat you’re dealing with right now.
Washington DC Sees Temperatures Over 20 Degrees Lower Than Today
Out east, Washington, D.C., is forecast for a drop of 22 degrees by Tuesday, one of the most dramatic swings anywhere along the East Coast. If you’re in the D.C. metro, this cooldown will feel every bit as significant as what’s headed for the central Plains, marking a genuine, abrupt transition out of the lingering summer warmth that’s gripped the region.
New York, Boston and the Northeast Cool Sharply as Well
The chill doesn’t stop at D.C. New York City is forecast to cool by 16 degrees, while Boston sees an even sharper drop of 19 degrees. If you’re anywhere across the Northeast corridor, from New York up through Boston, plan on a genuinely crisp changeover arriving right around Tuesday, with temperatures falling well below what you’ve experienced through much of this week.
Charlotte and the Mid-Atlantic Also Join the Broader East Coast Cooldown
Farther south, Charlotte is forecast to see highs drop 12 degrees by Tuesday, part of a broader East Coast cooldown running 12 to 16 degrees across much of the region. If you’re in Charlotte or nearby communities across the Carolinas, this cooldown won’t hit quite as hard as what’s forecast for D.C. or Kansas City, but it’s still a meaningful, noticeable shift heading into the new week.
Detroit, Chicago and the Midwest See a Solid Drop as Well
Across the Midwest, Detroit is forecast for a 13-degree drop by Tuesday, while Chicago sees a more modest but still meaningful 5-degree decrease. Minneapolis, interestingly, bucks this trend entirely with a projected increase of 6 degrees, meaning if you’re in the Twin Cities, don’t expect the same relief your neighbors farther south and east are getting.
Nashville, Oklahoma City and the South Central US Cool Into the Low Teens
Farther south, Nashville and Oklahoma City are both forecast to see highs drop 12 degrees by Tuesday. If you’re anywhere across this stretch of the South Central US, expect a real, tangible cooldown, even if it doesn’t reach the dramatic 20-plus-degree swings forecast for Kansas City or Washington, D.C.
Dallas, Houston and Miami Stay Largely Unchanged or Even Warm Slightly
Not everyone is getting in on this cooldown. Dallas is forecast to see essentially no change, sitting right at 0 degrees difference, while Houston actually warms slightly by 3 degrees and Miami warms by 4 degrees. If you’re anywhere along the Gulf Coast or in South Florida, don’t expect Tuesday to bring the same relief that’s heading toward the central and eastern US; your weather looks set to stay largely status quo.
Boise and the Intermountain West Take the Opposite Path
While most of the country cools down, the Intermountain West is heading in the exact opposite direction. Boise, Idaho, is forecast for a significant warmup of 14 degrees by Tuesday, the single largest increase anywhere on the map. Salt Lake City also warms modestly, by 2 degrees, while Seattle ticks up just 1 degree. If you’re in Boise specifically, get ready for a noticeably hotter Tuesday even as places like Kansas City and D.C. are diving into fall.
Los Angeles Warms While Phoenix, Las Vegas and Denver See Slight Cooling
Elsewhere across the West, Los Angeles is forecast to warm by 3 degrees, while Phoenix cools slightly by 3 degrees and Las Vegas and Denver both see modest 2-degree decreases. This mixed bag across the Southwest and Rockies shows just how localized this pattern shift really is, with Boise’s sharp warmup standing out as the clear outlier compared to its neighboring cities.
What This Means for Your Tuesday Plans
Wherever you are, this map is worth a close look before finalizing weekend and early-next-week plans. If you’re in Kansas City, Omaha or Washington, D.C., prepare for one of the more dramatic single-week temperature swings you’ll see all year. If you’re along the broader East Coast, from New York and Boston down through Charlotte, expect a real but somewhat less extreme cooldown. And if you’re in Boise or elsewhere across the Intermountain West, don’t put away the summer gear just yet, since your Tuesday is trending warmer, not cooler, than what you’re feeling today.
