My first day at KPRC 2 was July 15, 2003. That fall, I received my first email from a viewer explaining that the system moving through Southeast Texas couldn’t be a cold front because it wasn’t actually cold. You’ve heard the saying, “If a had a nickel every time someone said this, I’d be rich!” And this isn’t an understatement.
My answer used to be simply showing the science and not arguing. Well, that didn’t exactly settle the debate. So, over time, I adjusted how I explained what a cold front is.
If you’re a regular KPRC 2 viewer, you’ve probably heard me use one of three phrases: a “front” is moving through, a “cool front” is on the way, or a “cold front” is coming.
Here’s the thing: meteorologically, all three mean the same thing!
So, let’s start with the actual meteorological definition of a cold front.
That’s the key. A cold front is a boundary between two air masses, and one of the ways we identify it is by a change in wind direction. Temperature matters, too, but it’s not the defining characteristic.
As summer winds down and fall approaches, cold fronts begin pushing toward Southeast Texas. The first couple often tease us, stalling out before they make it all the way to Houston. That’s why you’ll hear me say, “Never trust the first cold front. It won’t make it here.”
Eventually, usually by the third or fourth attempt, one finally pushes through.
Ahead of a cold front, we typically have surface winds blowing from the south. Behind it, winds shift and blow from the north. That wind shift defines when the front has passed.
So, if it’s called a cold front, why doesn’t it always feel cold? That’s where the confusion comes in.
Across much of the continental United States, cold fronts are often accompanied by a significant drop in temperature. But by the time those fronts reach Houston, especially in late summer and early fall, they’ve often lost much of their punch. The wind shifts, but the cooler air behind the front may not be all that cool by our standards.
That’s why a cold front can move through Houston without delivering what most of us would consider cold weather.
Our first cold front of the season moved through Southeast Texas on Thursday, September 24. Winds shifted from the southeast to the northeast, bringing in drier air and lowering our humidity. But temperatures? They barely budged.
The graphic below shows how the front affected our morning temperatures. Afternoon highs dropped from the upper 90s to the lower 90s.
That’s a perfect example of why a cold front doesn’t necessarily mean cold weather. The wind shifts, the humidity drops, and temperatures may fall a few degrees but it still feels like summer in Houston.
There is an old meteorological saying that once the first cold front moves through Southeast Texas, hurricane season is essentially over for us.
Obviously, hurricane season doesn’t officially end until November 30. But there is some meteorological truth behind the saying.
Think of that front as a brick wall.
Once the front moves through, the northerly winds associated with it block tropical systems from moving north into Southeast Texas. Instead, storms get steered either toward the west or, more commonly this time of year, toward the east.
I’m good friends with Eric Berger of Space City Weather. He wrote an article that our first “real” cold front comes in when morning temperatures reach 65°. That happened October 9th. The high that day was 93° but it was a dry heat. You can read the article here.
A few years ago, we came up with a simple way to define Houston’s first real cold front of the season, something we could all agree on.
The wind shift still matters, but we added one more requirement: three consecutive days with high temperatures in the 70s. That’s our benchmark for a real taste of fall in Houston.
The graphic below shows when Houston (IAH) first met that standard each year since 2020.
For 2026, I’m expecting our first real cold front to arrive this weekend, with highs in the 70s from October 16–18. That would match 2021, when we hit the same milestone on those exact dates.
Enjoy it, Houston! Cooler temperatures, low humidity, and a refreshing north wind are finally on the way.
