Emergency crews were busy clearing wrecks and tending to fender benders.
Fransisco Sanchez with Houston TranStar says water on the roadways lead to all kinds of challenges.
"Any time you get a significant amount of rain in a short period of time, we're gonna have road flooding here. And then another challenge is the roadways have been dry for some time, so once they get wet again, it becomes so slick, because the oil and some of the residue that's on there."
Some street flooding came after the clouds opened up.
"Anytime we get 2-3 inches of rain in an hour or two, we're going to see water ponding on the streets. But that is to be expected when we do get that kind of rain."
That's Heather Saucier with the Harris County Flood Control District. She says the Buffalo Bayou watershed fared well, considering all the rain.
"The only channel that got kind of high was a little channel called Brickhouse Gulley, which is a tributary of White Oak Bayou. It never came out of its banks, but it certainly responded with all of the rain that that particular watershed received."
Meteorologist Gene Hafele with the National Weather Service says conditions remain unstable as a mild cold front approaches the Houston area.
"Next couple of days, we expect the frontal system to actually move through the Houston area, but we're gonna probably remain cloudy. We're gonna have periods of rain, showers and thunderstorms...probably through Friday."
EnjoyÎ¾the cooler conditions. Hafele says early next weekÎ¾— sunny skies and no rain.
PH, KUHF-Houston Public Radio News.