textproduct: Indianapolis

KEY MESSAGES

- Cooler weather will continue through the upcoming week, with afternoon temperatures staying below seasonal averages

- A few light showers tonight into tomorrow, mainly across eastern Indiana

- Persistent mostly cloudy skies will begin to break towards Friday

DISCUSSION (This evening through Tuesday)

Issued at 202 PM EDT Tue Sep 22 2026

Overview.

Central Indiana is set for a prolonged stretch of cool, dry autumn weather. High pressure anchored to the north and northeast will keep a continuous supply of cool air moving into the region on northeasterly winds. Persistent low level moisture combined with cooler air will keep skies mostly cloudy to cloudy through Thursday. Skies will then clear Friday into the weekend with a slight warming trend going into next week.

Tonight Through Thursday.

Broad high pressure continues to remain locked in place across the Great Lakes region along with low pressure to the southeast allowing for persistent northeasterly flow both at the surface and near surface. This is helping to keep widespread cloud cover in place across much of central Indiana along with keeping temperatures slightly below normal. A weak shortwave will push southeast across Iowa tonight into tomorrow which will interact with a remnant vort max across Ohio during the daytime hours to bring few light rain showers to central Indiana, mainly across the eastern counties. Beyond those low chances, dry weather is expected through the remainder of the 7 day forecast with a fairly steady-state weather pattern continuing into Thursday.

Friday Through Tuesday.

Increasing subsidence aloft along with weak upper level flow will begin to break down the cloud cover Friday into the weekend will help to bring temperatures closer to normal for this time of the year. Min RH values will drop below 40 percent across south central Indiana which combined with the drier conditions of late, may need to be monitored for a low-end fire danger. Near calm winds will help to limit that threat.

Looking further into early next week, temperatures in the lower 80s look to return as the surface flow gradually gains a more southerly component along with gradually increasing rain chances towards late Tuesday ahead of the next system.

AVIATION (18Z TAF Issuance)

Issued at 202 PM EDT Tue Sep 22 2026

Impacts:

-MVFR to IFR cigs through the TAF period -Low chance for light rain late tonight and tomorrow

Discussion:

Cigs are expected to remain MVFR or worse through the TAF period with levels generally around 020 through the remainder of the day today. High IFR around 007 will be possible during the overnight, mainly from 06Z to 12Z with cigs generally around 015 otherwise. There may be some drizzle tonight but winds should remain strong enough to limit coverage. Better chances for rain arrive tomorrow afternoon, mainly at IND. Winds will generally remain northwesterly at 7-12kt through the TAF period.

IND WATCHES/WARNINGS/ADVISORIES

None.