Indianapolis is starting Monday in full swamp-mode, with muggy air, mostly clear skies, and temperatures in the low 70s at Indianapolis International Airport. The warm‑up will be fast: highs are expected to push near 90°F this afternoon, with heat‑index values climbing over 100°F during the hottest part of the day. Showers and thunderstorms are likely after about 2 p.m., and a few could turn strong to severe.
Heat Advisory Through Monday Evening
The National Weather Service has a Heat Advisory in effect from 11 a.m. to 9 p.m. on Monday, July 27, for portions of central Indiana. Forecasters warn that heat‑index values could hit as high as 110°F and caution that the hot, humid setup "may cause heat illnesses," according to NWS Indianapolis.
Afternoon Storms Could Be Strong
Forecasters say the atmosphere will be unusually primed for organized thunderstorms this afternoon and evening, even though the exact timing and track remain fuzzy. The main concern is damaging straight‑line winds, with guidance suggesting isolated gusts could reach 60–80 mph in a worst‑case scenario, and scattered heavy downpours and small hail also on the table. Because storm motion will depend on how any thunderstorm complexes develop, conditions could change quickly, so keep an eye on the sky and be ready to act on any warnings.
Where To Cool Off
If your air conditioning is unreliable or nonexistent, Indy Parks Family Centers are open as cooling centers today. Locations and hours vary, so check before you head out. For the full list and current hours, see Indy Parks & Recreation.
Tonight And Tuesday
Scattered showers and thunderstorms remain possible into the night, with one window of activity before about 11 p.m. and another late tonight. Lows will hang in the mid‑70s, with southwest winds around 10 mph and gusts up to 20 mph. A weak front sliding through Tuesday morning should bring slightly cooler, drier air. Highs on Tuesday are expected near 86°F, with northwest winds of 8–13 mph and gusts into the 20s, which should make it feel noticeably less sticky and more tolerable for outdoor plans.
What To Do Now
Try to push strenuous outdoor work to the cooler parts of the day, hydrate often, and check on neighbors who may not have air conditioning. If storms move in, get indoors, avoid flooded roads, and follow local emergency alerts and forecasts for any watches or warnings that may be issued.
For more background on this stretch of summer heat, revisit our late‑June coverage of the brutal heat wave bear-hugs city all week. This story will be updated if watches or warnings change for central Indiana.
