Southport, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Southport, a city in Marion County, Indiana.
Today
89°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 5pm, then a chance of showers and thunderstorms. Partly sunny. High near 89, with temperatures falling to around 85 in the afternoon. South wind around 8 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Southport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Slight Chance Showers And Thunderstorms | 8 mph S | 65% |
| Tonight | 70°F | Chance Showers And Thunderstorms then Mostly Cloudy | 7 mph SSE | 25% |
| Sunday | 86°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 3 to 8 mph WNW | 32% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 52% |
| Monday | 71°F | Rain Showers Likely | 13 mph ENE | 64% |
| Monday Night | 56°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 64% |
| Tuesday | 70°F | Chance Showers And Thunderstorms | 13 mph NE | 43% |
| Tuesday Night | 57°F | Chance Showers And Thunderstorms | 7 to 14 mph NNE | 33% |
| Wednesday | 70°F | Slight Chance Rain Showers | 9 mph NNE | 15% |
| Wednesday Night | 57°F | Mostly Cloudy | 6 to 9 mph NNE | 10% |
| Thursday | 71°F | Partly Sunny | 6 to 10 mph NNE | 5% |
| Thursday Night | 56°F | Mostly Cloudy | 6 to 10 mph NNE | 5% |
| Friday | 73°F | Mostly Sunny | 6 to 9 mph NNE | 3% |
| Friday Night | 54°F | Partly Cloudy | 5 to 9 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Southport (39.660, -86.117). Updated through the day.
Growing snapshot for Southport
Last spring frost
Apr 20
First fall frost
Oct 21
Growing season
183 days
Hardiness zone
6b
More local growing data for Southport: nearby ZIP 46227 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Beech Grove
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Homecroft
Indianapolis city
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Speedway
Spring Hill
Warren Park
Williams Creek
Wynnedale
Climate data from the nearest NOAA station, Indianapolis Se Side, In (4.5 mi from Southport). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.