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Cooler air arrives for the start of the fall season

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Central Indiana has seen a breezy and cooler day to end the weekend. What’s crucial about the wind is the direction it’s coming from and that’s the northwest. This will bring in cooler and drier air for the overnight hours and this will allow our temperatures to fall very quickly. This evening alone, temperatures will drop from 67°F at 6 PM to 60°F at 10 PM here in Indianapolis. Once the clouds decrease after midnight, that’s when temperatures take a nose dive!

morning rushTONIGHT: Skies turn mostly clear overnight and winds will also subside. This will allow temperatures to fall between 40-48°F for early Monday morning. The city of Indianapolis will be the warmest with a low of 48° due to the heat island effect from our city. But the outlying areas will see significantly cooler temperatures. Lows could fall as low as the 40 degree mark in the northeastern part of our state. This includes Muncie, Marion, Gas City and Kokomo.

MONDAY: High pressure is moving into the state on Monday and this will ensure plenty of sunshine for the day. But due to the very chilly start, temperatures will have a lot more ground to cover which will result in cooler daytime highs again. Highs ranging from 63-68° seem very feasible across our viewing area. The normal high for this time of year is 75°F.

FALL STARTSFALL BEGINS: The autumnal equinox happens at 10:29 PM Monday and this means that the fall season is officially here. On the equinox, the suns rays line up with the equator but as we venture deeper into fall, those rays will shift more and more south of the equator. This means cooler conditions here in Indiana.

EXTENDED: High pressure will remain the main feature this week for the forecast. We’ll enjoy plenty of sunshine and those cool overnight temperatures. Slowly, daytime highs will start to get a bit warmer and return to the upper 70s by Friday. As for now, the models are split regarding this coming weekend on the Sunday outlook. One solution has a low pressure system finally sneaking in from the south while the other long range model has high pressure holding on tight. We’ll continue to keep an eye on that next chance for rain but that this point it’s not a guaranteed thing on Sunday.