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The first day of fall isn’t until next week, and the Indianapolis forecast for this week is reminding us that summer isn’t over yet with temperatures in the upper 80s.
Here’s what to know.
When is fall 2025?
The first official day of fall, or the autumnal equinox, is on Monday, Sept. 22, 2025.
What is the autumnal equinox?
The autumnal equinox is an astronomical event that marks the start of autumn, according to the Farmer’s Almanac. The autumnal equinox for the northern hemisphere and the first day of fall begin on the same day.
The fall equinox and the first day of autumn arrive on Monday, September 22, 2025, at 2:19 P.M. EDT.
Fall leaves begin to change and float to the water along the Central Canal Towpath on Monday, October 21, 2024, in Indianapolis.
Is it normally this hot in September?
Acccording to historical weather data from NWS Indianapolis, on average the temperature high for September is 78.2 degrees.
So for September in Indianapolis, especially this week, we are seeing temperatures above average. On Monday, Sept. 15 the temperature peaked at 88 degrees.
The hottest day of the month last year was on Sept. 21, 2024 (the day before the autumnal equinox), when the temperature reached 94 degrees.
Indianapolis weather forecast
Here’s the weather forecast for the rest of the week according to NWS Indianapolis:
Tuesday: Partly sunny, with a high near 87. Northeast wind 3 to 5 mph.
Tuesday night: Partly cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening.
Wednesday: Sunny, with a high near 88. Calm wind.
Wednesday night: Mostly clear, with a low around 62. Light east southeast wind.
Thursday: Sunny, with a high near 90. Calm wind.
Thursday night: Mostly clear, with a low around 63. Light and variable wind.
Friday: Mostly sunny, with a high near 90. Calm wind becoming south southeast around 5 mph in the afternoon.
Friday night: Mostly cloudy, with a low around 66. East southeast wind around 6 mph.
Saturday: A 20% chance of showers. Partly sunny, with a high near 84. East southeast wind 3 to 6 mph.
Saturday night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South wind 3 to 6 mph. Chance of precipitation is 30%.
Sunday: A 30% chance of showers and thunderstorms. Partly sunny, with a high near 82.
Sunday night: A 30% chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
For the most up-to-date forecast, visit forecast.weather.gov.
When does daylight saving time end?
Daylight saving time will end at 2 a.m. local time on Sunday, Nov. 2, 2025. This means the clocks will “fall back” and we will get an extra hour of sleep on this day.
On Sunday, March 8, 2026 daylight saving time will begin again.
More on DST 2025: When does Daylight Saving Time 2025 end? Falling back means an extra hour
Is it autumn or fall?
Technically, it is both.
Autumn is the oldest word used to describe the season between summer and winter. However, in the 1600s, some people started abbreviating the season to “fall” in association with the phrase often used by poets “fall of the leaves,” according to Merriam-Webster.
Chris Sims contributed to this report.
Katie Wiseman covers trending news for IndyStar and Midwest Connect. Contact her at klwiseman@gannett.com. Follow her on Bluesky @katiewiseman
This article originally appeared on Indianapolis Star: When is fall? Is it usually this hot in September? See the weekly forecast
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