Above-normal temps predicted for U.S. in September 

Most of the country is set to experience above-normal temperatures in September, according to the National Weather Service’s (NWS) preliminary outlook. 

What’s happening: On the third Thursday of each month, the NWS releases a “monthly temperature outlook,” which it then updates on the last day of the month. 

Go deeper: Issued on August 21, the September forecast predicts that temperatures across the country, excluding a sliver of Southern California, will be “leaning above” — meaning they have at least a 33 percent chance of being above what the agency defines as normal for the month.

• Meanwhile, temps will be “likely above” — at least a 50 percent chance of being above normal — in New England, South Florida, and along the Rocky Mountains, per the outlook. 
• No place in the country is predicted to see cooler-than-normal temperatures.

The big picture: The forecast builds on a favorable comparison, as U.S. Cooling Degree Days, the primary measure of cooling demand, in September 2024 were only four percent above normal levels — and flat compared to 2023. 

• September’s outlook will be updated on August 31.