Indianapolis Weather Today: Hour-by-Hour Forecast, Storm Warnings & Must-Know Safety Updates

Indianapolis woke up to a blanket of low clouds and a crisp northeasterly breeze this Sunday, May 25, 2025, as temperatures hovered near 50 °F at sunrise. Afternoon highs are expected to struggle into the upper 60s, roughly five degrees below the seasonal norm, while skies remain mostly cloudy before gradual clearing late day. Race-day outlook Weather will be front-of-mind for the 109th running of the Indianapolis 500. The National Weather Service and local forecasters agree on a dry, partly sunny setup for the green flag, with race-time temperatures near 68 °F and light northeast winds—ideal conditions for drivers and fans alike. Track temperatures should climb into the low 70s by mid-afternoon, reducing the risk of tire grip issues that plagued practice runs earlier in the week. Extended Memorial Day forecast • Monday: Sunshine dominates, highs 70-74 °F. Perfect for holiday cookouts and downtown parades. • Tuesday–Thursday: A warming trend continues; highs rebound to the upper 70s. Humidity creeps up by mid-week. • Friday: A potent spring cold front arrives. Thunderstorms may turn strong, with isolated wind gusts above 60 mph and small hail possible during the late-day commute. Rain totals of 0.50-1.00″ are likely. • First weekend of June: Behind the front, cooler, drier air returns; mornings drop to the upper 40s with pleasant afternoons in the mid-60s. Severe-weather recap and outlook Central Indiana already endured a significant outbreak on May 16 featuring multiple tornadoes, 4″ hail, and widespread 80 mph straight-line winds. While the severe season typically peaks in late May, this week’s frontal passage could trigger another round of storms. Residents should refresh preparedness plans, verify that NOAA Weather Radios have fresh batteries, and enable emergency alerts on mobile devices. Climate context Driven by a weakening La Niña and lingering Gulf moisture, the May precipitation tally at Indianapolis International Airport sits 1.2″ above the long-term average. Meteorologists anticipate above-normal rainfall through early June, followed by a warmer-than-usual summer pattern according to long-range outlooks from the Climate Prediction Center. What this means for Hoosiers • Outdoor events: Sunday and Memorial Day offer comfortable windows for grilling, hiking at Eagle Creek Park, or visiting the Indianapolis Zoo. • Agriculture: Recent rains have boosted soil moisture, providing favorable germination for newly planted corn and soybean fields. • Allergy sufferers: Tree pollen remains moderate; grass pollen will spike as lawns dry out mid-week. Bottom line Clouds and cool air headline today’s Indianapolis weather story, but an almost picture-perfect Indy 500 and Memorial Day beckon. Keep an eye on late-week thunderstorms, stay weather-aware, and enjoy one of the most pleasant stretches of spring the city has seen this year.