Well, northern Michigan, we have already entered the second half of September. Last year the second half of the month brought slightly below normal temperatures, as afternoon highs across northern Michigan were generally in the mid 50s to lower 60s, while low temperatures were in the 30s and lower 40s.
In contrast, the second half of September this year is trending much milder with above normal temperatures. Afternoon highs will trend seasonal to above normal in the 60s and lower 70s while low temperatures will trend toward the 40s and lower 50s.
Interesting fact: The warmest temperature recorded during the second half of September last year was 65 to 66 degrees around Gladwin, Standish, Hale and Rose City. In contrast, some of the warmest temperatures during the second half of September this year will be today (Sept 19th) when afternoon readings warm into the 80s.