Marietta, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Marietta, a village in Fulton County, Illinois.

This Afternoon

80°F

Mostly Sunny

Mostly sunny, with a high near 80. East wind around 8 mph.

7-day forecast for Marietta

When	Temp	Forecast	Wind	Precip
This Afternoon	80°F	Mostly Sunny	8 mph E	7%
Tonight	69°F	Partly Cloudy then Slight Chance Showers And Thunderstorms	8 mph SE	19%
Saturday	88°F	Slight Chance Rain Showers then Mostly Cloudy	5 to 8 mph SSW	18%
Saturday Night	67°F	Mostly Cloudy then Chance Showers And Thunderstorms	3 to 7 mph NE	60%
Sunday	77°F	Rain Showers Likely	1 to 10 mph N	66%
Sunday Night	59°F	Showers And Thunderstorms Likely	7 to 12 mph NE	68%
Monday	66°F	Showers And Thunderstorms Likely	12 mph NE	68%
Monday Night	54°F	Chance Rain Showers	6 to 12 mph NE	48%
Tuesday	64°F	Chance Rain Showers	10 mph NE	29%
Tuesday Night	49°F	Mostly Cloudy	2 to 7 mph NNE	4%
Wednesday	68°F	Mostly Sunny	6 mph NNE	2%
Wednesday Night	52°F	Partly Cloudy	0 to 3 mph NNE	1%
Thursday	69°F	Mostly Sunny	0 to 3 mph NNE	4%
Thursday Night	54°F	Partly Cloudy	2 mph NNE	4%

Forecast source: National Weather Service (api.weather.gov) for Marietta (40.499, -90.393). Updated through the day.

Growing snapshot for Marietta

Last spring frost

Apr 17

First fall frost

Oct 22

Growing season

185 days

Hardiness zone

More local growing data for Marietta: nearby ZIP 61459 weather · frost dates · planting calendar · Illinois frost dates

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All Illinois locations ›

Climate data from the nearest NOAA station, Prairie City 2S, Il (6.1 mi from Marietta). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.