Long Range Forecast Predicts First Cool Snap For Acadiana
Unfortunately, terms like "cool" and "cold" temperatures are objective. What might be cool or cold to me could be totally warm or hot to you. So, we'll have to break down the Old Farmer's forecast with lots of wiggle room.
In their long-range outlook for the Deep South for September and October the Old Farmer's Almanac suggests that "chilly" conditions will affect the area between September 18th and 30th. Exactly what "chilly" translates too isn't defined but based on long-range outlooks from traditional weather services it looks as if a coat won't be necessary.
The Almanac also suggests a cool spell the first week in October but again the temperatures are not necessarily defined. Based on charts posted to the Old Farmer's website we might see temperatures as much as six degrees below normal.
The average high in October in Lafayette is 81 degrees, the normal low is 59 degrees. So, if you subtract six degrees that would mean 75 for a high and 53 for a low, which would be cool enough to bring out the sweaters and pumpkin spice.
My guess is this. I think before the end of September there will be a morning cool enough that you will want a light jacket or at least long sleeves. By the middle of October, there will be a few days you'll be needing a jacket. By Halloween, you'll be needing costume make up that won't drip off when you sweat because it's always too darn hot for Halloween.
Oh, one more thing. The Old Farmer's Almanac is NOT predicting any more tropical threats for the Gulf South through the end of 2019.