Marietta, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marietta, a community in Shelby County, Indiana.
Tonight
65°F
Isolated Rain Showers then Mostly Cloudy
Isolated rain showers before 9pm. Mostly cloudy. Low around 65, with temperatures rising to around 67 overnight. East wind around 8 mph. Chance of precipitation is 20%.
7-day forecast for Marietta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Isolated Rain Showers then Mostly Cloudy | 8 mph E | 16% |
| Saturday | 89°F | Partly Sunny then Scattered Showers And Thunderstorms | 8 mph SSE | 49% |
| Saturday Night | 70°F | Scattered Showers And Thunderstorms | 7 mph SSE | 49% |
| Sunday | 88°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph SW | 31% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms | 6 to 10 mph NNE | 50% |
| Monday | 76°F | Showers And Thunderstorms Likely | 8 to 12 mph NE | 63% |
| Monday Night | 58°F | Chance Showers And Thunderstorms | 8 to 14 mph NE | 51% |
| Tuesday | 72°F | Chance Showers And Thunderstorms | 12 mph NE | 48% |
| Tuesday Night | 57°F | Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 14 mph NNE | 37% |
| Wednesday | 71°F | Mostly Cloudy | 6 to 9 mph NNE | 8% |
| Wednesday Night | 57°F | Mostly Cloudy | 3 to 9 mph N | 8% |
| Thursday | 73°F | Partly Sunny | 5 to 8 mph N | 6% |
| Thursday Night | 57°F | Mostly Cloudy | 5 to 8 mph NNE | 6% |
| Friday | 73°F | Mostly Sunny | 5 to 8 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Marietta (39.441, -85.881). Updated through the day.
Growing snapshot for Marietta
Last spring frost
Apr 20
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
6b
More local growing data for Marietta: nearby ZIP 46124 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Boggstown
Carrollton
Edinburgh
Fairland
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Fountaintown
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Gwynneville
London
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Morristown
Pleasant View Village
Shelbyville
Waldron
Climate data from the nearest NOAA station, Franklin Wwtp, In (8.4 mi from Marietta). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.