INDIANAPOLIS | Indianapolis will finish Saturday warm and partly sunny, with a high near 86°F and a light south-southwest wind before moisture and a passing front bring showers and thunderstorms overnight. The National Weather Service expects storm chances to increase late tonight, with showers becoming more likely toward daybreak. The overnight low will be near 66°F. Rainfall should generally range from one-tenth to one-quarter inch, with locally higher amounts possible in thunderstorms.
This is a Daily Weather Brief, not a Severe Weather Alert. No qualifying severe-thunderstorm or tornado watch was active for Indianapolis at publication time. A new National Weather Service warning or watch would supersede this general forecast. Residents should keep alerts enabled because thunderstorms can still produce lightning, brief heavy rain and gusty wind without meeting severe criteria.
Saturday afternoon remains the best outdoor period. Humidity will be noticeable, and people attending festivals, sporting events or neighborhood gatherings should use sunscreen, drink water and take breaks. Organizers should identify indoor shelter before storms approach. Tents, trees and open pavilions do not provide safe lightning protection.
Anyone who hears thunder should move into a substantial building or hard-topped vehicle and remain there for at least 30 minutes after the final thunder. People camping or working outside overnight should monitor radar and alerts rather than relying on visual conditions alone.
Sunday morning will be wetter and cooler. The NWS forecasts showers and possibly a thunderstorm before late morning, followed by a chance of additional showers or storms through early afternoon. The chance of precipitation is about 80 percent, with a high near 75°F. South-southwest winds will turn northwest at 7 to 11 mph, with gusts up to about 22 mph.
Rainfall Sunday should again average roughly one-tenth to one-quarter inch, with higher totals under thunderstorms. Drivers may encounter reduced visibility and ponding. Never enter water covering a road, and allow additional stopping distance during heavier rain.
Clouds should gradually break later Sunday. Sunday night will be partly cloudy with a low near 55°F. Monday is expected to be mostly sunny with a high near 75°F, providing a quieter and more comfortable start to the workweek.
Thunderstorm chances return later Tuesday and increase Tuesday night, with Wednesday also carrying a chance of storms. Forecast confidence decreases with time, so residents with outdoor work or travel should check updated timing. The current outlook does not justify a severe-weather label for Indianapolis today.
Travel conditions should be best Saturday afternoon and Sunday afternoon after the main rain moves east. Overnight drivers may encounter standing water and sudden visibility changes. Airline delays are possible if storms affect Indianapolis International Airport or major connecting hubs.
Households still cleaning up after earlier storms should secure tarps, tools and loose debris before the overnight rain. Downed lines must be treated as energized, and damaged trees should be handled by trained crews.
The practical weekend plan is to use Saturday afternoon for outdoor activity, preserve flexibility tonight and Sunday morning, and expect cooler, drier conditions by Sunday afternoon and Monday.
Additional Reporting By: National Weather Service Indianapolis point forecast; National Weather Service Indianapolis; WTHR 13 Weather; NOAA Storm Prediction Center