Not so long ago, Mr. Mamdani was a little-known state assemblyman. But his personality and platform captivated an unlikely coalition of New York City primary voters.

The shape of the mayor’s race in November and the future of Andrew M. Cuomo are now in flux after Zohran Mamdani’s performance on Tuesday.

Climate change is increasingly making weather extremes more common.

Mr. Weiner returned from a prison term to launch an unlikely campaign for the City Council. Outside a polling place on Tuesday, it was hot, mostly friendly and a little awkward.