I didn’t see the April thread when I first posted this in the March thread. So, I deleted it there and will instead leave it here:
With no summer 2026 thread yet (there’s only a tropics thread so far), I’ll put this here. This is from pro-met Travis Hartman of Vaisala Xweather:
What kind of summer are we walking into?
For 2026, the early answer is: another warmer-than-normal season in the US and Europe with important regional caveats.
Ocean signals point to warmth
A major driver of the expected heat is the ocean. Global sea surface temperatures remain historically warm, and the North Atlantic is firmly in its positive multidecadal phase, also known as warmer-than-average Atlantic Multidecadal Oscillation (+AMO). In plain terms, the Atlantic has been running hot for decades, and warm oceans amplify heat on land. A warmer Atlantic tends to pump up the Bermuda High, helping lock in warmer conditions across the Eastern US.
Enter El Niño—but with nuance
Models suggest that El Niño will develop through the summer. Historically, El Niño can take some of the edge off the heat in the Midwest and East by shifting the jet stream. But whether that cooling influence is realized depends on an unlikely character: West Pacific typhoons. Their recurving paths can tug on the jet stream in ways that promote cooler conditions across the US. Fewer typhoons, on the other hand, leave the hotter background state unchallenged. And recent decades have seen a trend toward fewer summer typhoons overall.
So, what does this mean for 2026?
The forecast calls for summer 2026 to rank as the 11th-hottest since 1950, with the strongest confidence in significant heat across the West and South. The Midwest and East are the wild cards—torn between ocean-driven warmth and the possibility (but not the guarantee) of El Niño-related moderation.