Weather in Marietta, Illinois
Live weather conditions. Source: Open-Meteo
Updated May 24, 2026 · 04:08 PM ET · Refreshes every hour
80°F
Clear sky
Feels like 80°F
35%
Humidity
8 mph
Wind Speed
About Weather in Marietta
Marietta is located in Illinois (coordinates: 40.49945°N, 90.393016°W). Weather data is sourced from Open-Meteo, a free and open meteorological API using data from national weather services including NOAA.
All temperatures are displayed in Fahrenheit. Wind speed is in miles per hour.