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Speedway, IN Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Speedway, a town in Marion County, Indiana.

Today
88°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 11am and 1pm, then showers and thunderstorms likely between 1pm and 4pm, then a chance of showers and thunderstorms. Partly sunny. High near 88, with temperatures falling to around 85 in the afternoon. South wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast for Speedway

WhenTempForecastWindPrecip
Today 88°F Slight Chance Showers And Thunderstorms 7 mph S 64%
Tonight 70°F Slight Chance Showers And Thunderstorms then Mostly Cloudy 6 mph S 23%
Sunday 85°F Partly Sunny then Chance Showers And Thunderstorms 3 to 8 mph WNW 46%
Sunday Night 61°F Showers And Thunderstorms Likely 12 mph NE 56%
Monday 71°F Showers And Thunderstorms Likely 9 to 13 mph NE 63%
Monday Night 55°F Rain Showers Likely 9 to 13 mph NE 61%
Tuesday 69°F Chance Showers And Thunderstorms 12 mph NE 42%
Tuesday Night 56°F Chance Showers And Thunderstorms 6 to 12 mph NNE 33%
Wednesday 70°F Slight Chance Rain Showers 6 to 9 mph NNE 15%
Wednesday Night 56°F Mostly Cloudy 5 to 9 mph NNE 9%
Thursday 71°F Partly Sunny 5 to 9 mph NNE 4%
Thursday Night 56°F Mostly Cloudy 5 to 9 mph NNE 4%
Friday 74°F Mostly Sunny 5 to 9 mph NNE 3%
Friday Night 55°F Partly Cloudy 5 to 9 mph NE 2%

Forecast source: National Weather Service (api.weather.gov) for Speedway (39.794, -86.248). Updated through the day.

Growing snapshot for Speedway

Last spring frost
Apr 12
First fall frost
Oct 29
Growing season
198 days
Hardiness zone
6b

More local growing data for Speedway: nearby ZIP 46224 weather · frost dates · planting calendar · Indiana frost dates

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Climate data from the nearest NOAA station, Indianapolis Eagle Creek Ap, In (2.9 mi from Speedway). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.