"But then there's going to be additional damage to our system, which may take another two to three days," he said.
Merten said the shelter is working with its partners, including the city, to ensure that everyone's needs are met.
"Fortunately no one's going to go without shelter, which is always important but particularly important when it's this hot outside," he said.
The temperature at Dallas Love Field reached 101 around 6 p.m. Saturday. That's a bit warmer than the 98-degree high at DFW International Airport, the official recording site for Dallas-Fort Worth.
But it's the heat index that really matters, and that reached a scorching 108 for Love Field and 105 at DFW. At Fort Worth's Meacham International Airport, the mercury hit 102 and the heat index was 10 degrees higher.
Temperatures on Sunday and Monday should remain in the lower 90s, with Monday's high reaching 91. Temperatures will quickly rise again the rest of the week, edging up to near 100, though possibly without reaching it.
The best chances for rain come early in the week, with a 30 percent chance on Monday and a 20 percent chance Tuesday.