The maximum temperatures on Sunday would make you believe it was August 13 rather than September 13 yesterday. The NDAWN station in Fort Yates recorded a maximum of 98 degrees and the Mandan station 96 degrees. The Bismarck Airport reached a maximum of 97° which set a record high for the date.
It will be cooler today, with most NDAWN stations recording a maximum from the mid 70s to the very low 80s with the high heat from yesterday shifting south into southern and southwestern South Dakota.
The warmer air will surge north again tomorrow bringing high temperatures back into the 80s with a few lower 90s also expected.
Beyond tomorrow, tomorrow will slowly get to more seasonal normals with maximums mostly in the low to middle 70s with northern North Dakota in particular recording some upper 60s for maximums. Minimums will be quite mild Tuesday and Wednesday and then decrease Thursday through the weekend. Although some upper 30s are expected on Friday, at this time, no frost is foreseen for a vast majority of the state through at least Sunday.