textproduct: Indianapolis

KEY MESSAGES

- Dry through Saturday with seasonable temperatures

- Hotter and more humid air arrives Sunday and persists through much of next week

- Isolated thunderstorms may return mid to late week next week

FORECAST UPDATE

Issued at 940 PM EDT Fri Aug 28 2026

No substantive changes required to this evening's forecast. High pressure will provide another night of mostly clear skies, mild temperatures, and light winds. Patchy fog will be possible in the rural and climatologically favored areas, but should not be terribly widespread or dense. A gradual increase in high cloud is expected from the west overnight, but this will be of little consequence.

DISCUSSION (This evening through Friday)

Issued at 211 PM EDT Fri Aug 28 2026

Rest of This Afternoon through Saturday...

Quiet weather will continue this period. High pressure will be at the surface. The few to scattered cumulus will dissipate early this evening. Upper energy will bring some high clouds tonight through Saturday.

There may be some patchy fog tonight depending on how thick the cirrus becomes. Guidance looks a bit warm for low temperatures again, so nudged them down a bit. Lows will be in the upper 50s to lower 60s. Highs on Saturday will generally be in the lower to middle 80s.

Saturday night through Sunday night...

An 850mb jet will aid in maintaining convection as it moves into the Great Lakes region Saturday night. This convection will ride around the upper high (the high will be to the southwest of central Indiana). While some models like the NAM try to bring some of this into parts of the area later Saturday night into Sunday, believe that the ridge will win prevail across central Indiana and keep the area dry. Will continue with a dry forecast.

Warmer air will start to move into the area as the ridge builds on Sunday, with highs in the upper 80s to lower 90s expected. Southwest surface winds will bring in more humid air as well.

Monday and beyond...

The upper ridge will keep convection at bay at least through Tuesday. It may weaken enough for isolated convection to pop up Wednesday through Friday afternoons, but confidence remains low.

The main story will be heat with highs in the 90s each day. Low temperatures mainly in the 70s won't provide much relief. Humid air will provide heat indices near 100 degrees for at least Tuesday into Thursday. These conditions will likely require a Heat Advisory due to the length of the heat.

AVIATION (06Z TAF Issuance)

Issued at 1138 PM EDT Fri Aug 28 2026

Impacts:

- MVFR fog possible overnight; Otherwise VFR.

Discussion:

GOES19 shows a few high and mid clouds over the Wabash valley early this morning. Cigs will remain unlimited. Low dew point depressions at the outlying areas may result in some patchy MVFR fog. Confidence for this is low. Any fog will mix out in typical diurnal fashion after daybreak.

Winds will become more southeasterly to southerly during the day on Saturday, but remain below 10KT. A few cumulus along with high cloud cover can be expected, all of which is ultimately VFR.

IND WATCHES/WARNINGS/ADVISORIES

None.