Mild May or Early Heat: What to Expect

The weather is set for a gentle start in May, but the pattern will shift as summer approaches. Across most of the U. S. , temperatures will hover below normal, especially in the Midwest and much of the East. This cooler spell is caused by a low‑pressure system that keeps cold air stuck over the country, while a blocking pattern prevents it from moving northward. By mid‑May, that hold will weaken and warmer air will push in from the west. In the Midwest, cities like Chicago may see daytime highs 10 to 15 degrees lower than usual during the first week, and overnight lows could dip into the freezing range. Frost or even a brief freeze is likely around May 7–8, according to forecasters. Similar chills may affect the Mid‑Atlantic and New England, keeping people in their jackets longer than expected. The East Coast will feel more like late March or early April, with plenty of cloud cover and only a few sunny days. Some major cities—Detroit, Pittsburgh, New York City—could record May averages 2 to 4 degrees below normal. For instance, New York might stay in the 60s instead of rising into the 70s, and Chicago’s early May temperatures could linger in the 50s before warming toward late month.In contrast, the West Coast is already heating up. The Pacific Northwest will see temperatures that feel like late June, with Spokane potentially reaching 80 degrees in early May. The warmth will spread eastward through the Great Basin, putting places like Boise on track for highs in the 70s and 80s, with occasional 90‑degree days by month’s end. This rapid warming, combined with a dry snowpack, raises fire risk in the region. By late May and into June, most of the country will begin to see a gradual rise in temperature and humidity. The East’s transition will be slower, giving residents more time to enjoy cooler evenings, while the West will experience a quicker shift toward summer heat. Weather experts warn of an uneven summer: some areas may face extreme heat, others flash flooding, and the Northwest could battle drought and wildfires. Overall, May will start cool but set the stage for a hot, varied summer. People should prepare for cooler early weather and be ready to adapt as temperatures climb across the nation.