Below Average Temperatures to Grip the Northeast From May 9 Through May 13 With 60s by Day and 40s by Night Across Cleveland, Philadelphia, Boston, and Washington

NORTHEAST UNITED STATES — A prolonged stretch of below average temperatures was forecast to settle across the Northeast from May 9 through May 13, 2026, delivering daytime highs in the 60s and overnight lows in the 40s across a wide corridor covering Cleveland, Philadelphia, Boston, Washington, Buffalo, Cincinnati, and surrounding communities during a period when average temperatures typically sit around 70 degrees.

The temperature outlook covering the May 9 to May 13 window showed a broad below average designation blanketing the full Northeast and mid-Atlantic corridor, confirming a week-plus stretch of unseasonably cool conditions across one of the most densely populated regions of the country.

60s by Day and 40s by Night Across the Full Region

With the regional average temperature sitting around 70 degrees for this time of year, the forecast of daytime highs only reaching the 60s represented a meaningful departure from what mid-May conditions should feel like across the Northeast. The accompanying overnight lows dropping into the 40s added a noticeably chilly overnight element to the extended cool stretch, making the May 9 through May 13 period feel more reminiscent of early April than mid-May across communities from Cincinnati and Cleveland through Philadelphia, Washington, and Boston.

The below average temperature pattern was expected to persist consistently through the full five-day outlook window rather than representing a brief one or two day dip before returning to seasonal norms.

Extended Cool Pattern Follows Active Severe Weather Week

The below average temperature stretch arriving after May 9 followed what was shaping up as an active severe weather period through the earlier portion of the week, with the cool and settled pattern offering a welcome break from storm concerns across the broader region heading into the mid-May period.

Residents across Cleveland, Buffalo, Cincinnati, Philadelphia, Washington, Norfolk, Boston, and surrounding Northeast communities were advised to keep light jackets and layers accessible through the May 9 to 13 window as the below average temperature pattern kept conditions noticeably cooler than typical mid-May expectations across the full region.

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