Big Bend?
https://www.google.com/search?q=big+bend+current+weather&oq=big+bend+current&aqs=chrome.0.0j69i57j0l2j69i64.4886j0j4&sourceid=chrome&ie=UTF-8
Some creativity will be needed to make a longer route, esp on trail, however. Perhaps combine it with nearby Big Bend Ranch State Park if some road walking is OK (or do two separate loops).
I have never been there so I have no route ideas, unfortunately.
EDIT: A quick google search shows some potential if some potentially brief “Thru-hiker” some style road walks want to be done to connect the two units. Apparently, two classic loops are in each park. A 20-mile loop in the state park and a 30-mile loop in the NP. Â I’m sure there are ways to extend the loops. Connect the two parks and there you go. Or spend a lof time meandering in the national park. Â Again, I am not sure of the trails there personally. Â But with highs in the 80s next week and with lows around 55 +/- , the Big Bend area may be a good option for the CONUS.