Indianapolis/ Weather & Environment

Indianapolis Basks In Sun, Braces For Sunday Frost Before Big Warmup

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Published on October 17, 2026
Indianapolis Basks In Sun, Braces For Sunday Frost Before Big WarmupSource: Google Street View

Indianapolis is starting Saturday with clear skies, temperatures near 40 degrees and a brisk north breeze. The city should warm to about 55 degrees under full sunshine, making for a crisp but comfortable fall day.

Sunny Saturday Gives Way To Frost

Saturday night will stay clear as winds ease, with temperatures falling to around 34 degrees. A Frost Advisory is in effect from 2 a.m. to 9 a.m. Sunday, when frost could form and temperatures may drop as low as 33 degrees, according to the National Weather Service.

Sunday afternoon will rebound into the low 60s with sunny skies, but residents should protect tender outdoor plants before heading into the coldest part of the night. The advisory warns that exposed sensitive vegetation could be damaged or killed by the frost.

Clear Skies And A Big Warmup Next Week

The dry stretch continues Monday through Friday, with sunny skies and highs climbing from about 68 degrees Monday to 71 Tuesday and 73 Wednesday. Thursday and Friday could reach the mid to upper 70s, with forecast highs near 76 and 77 degrees, respectively.

Overnight lows will remain chilly early in the week, mostly in the upper 30s to mid-40s, but rain is not expected through Friday. In short, Indianapolis gets one more frosty reminder of fall before the forecast turns unusually mild.