Marietta, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 78°F 26°C Heat Index: 78°F	Observed at: Marietta, IL	Elevation: 805 ft | 245 m
	Last Updated: July 16, 10:30 PM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 78°F | 26°C
	Pressure: 29.31 in | 992.5 mb	Dewpoint: 71°F | 22°C
	Humidity: 80%	Wind: S 4 mph | S 6 kph
	Feels Like: 85°F | 29°C	Visibility: 38.3 mi | 61.7 km
	Lat/Long: 40.5011 | -90.3925	Sunrise: 5:45 AM   Sunset: 8:30 PM

7 Day Graphical Forecast

Valid: 10:33 PM 7/16/2026

Tonight Overcast 69 °F 10% Chance Precipitation Friday Overcast 92 |72 °F 26% Chance Precipitation Saturday Drizzle 95 |74 °F 39% Chance Precipitation Sunday Light Drizzle 84 |69 °F 13% Chance Precipitation Monday Light Showers 92 |69 °F 15% Chance Precipitation Tuesday Overcast 86 |66 °F 18% Chance Precipitation Wednesday Overcast 70 |52 °F 4% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:33 PM 7/16/2026

10 PM Clear 80 °F 1% Chance Precipitation

11 PM Clear 78 °F 1% Chance Precipitation

12 AM Partly Cloudy 78 °F 2% Chance Precipitation

1 AM Mostly Clear 77 °F 2% Chance Precipitation

2 AM Clear 76 °F 3% Chance Precipitation

3 AM Mostly Clear 75 °F 3% Chance Precipitation

4 AM Clear 74 °F 4% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for Marietta, IL - (Fahrenheit & Celsius) Valid: 10:33 PM 7/16/2026 Tonight Overcast with a low around 69°F [21°C]. WSW wind to around 6 mph [10 kph], with gusts to near 8 mph [12 kph]. Chance of precipitation 10% with QPF of 0.00 in [0.0 mm]. Friday Overcast with a high near 92°F [33°C]. WSW wind to around 10 mph [17 kph], with gusts to near 18 mph [28 kph]. Dewpoint near 71°F [22°C] with humidity of 93%. Pressure around 29.31 in [992.5 mb]. UV Index: 7.6. Chance of precipitation 26% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 72°F [22°C]. WSW wind to around 10 mph [17 kph], with gusts to near 18 mph [28 kph]. Chance of precipitation 26% with QPF of 0.00 in [0.0 mm]. Saturday Drizzle with a high near 95°F [35°C]. W wind to around 14 mph [23 kph], with gusts to near 30 mph [48 kph]. Dewpoint near 71°F [22°C] with humidity of 95%. Pressure around 29.31 in [992.5 mb]. UV Index: 7.7. Chance of precipitation 39% with QPF of 0.04 in [1.1 mm]. Saturday Night Drizzle with a low around 74°F [23°C]. W wind to around 14 mph [23 kph], with gusts to near 30 mph [48 kph]. Chance of precipitation 39% with QPF of 0.04 in [1.1 mm]. Sunday Light Drizzle with a high near 84°F [29°C]. E wind to around 9 mph [15 kph], with gusts to near 19 mph [31 kph]. Dewpoint near 71°F [22°C] with humidity of 96%. Pressure around 29.31 in [992.5 mb]. UV Index: 7.75. Chance of precipitation 13% with QPF of 0.00 in [0.1 mm]. Sunday Night Light Drizzle with a low around 69°F [20°C]. E wind to around 9 mph [15 kph], with gusts to near 19 mph [31 kph]. Chance of precipitation 13% with QPF of 0.00 in [0.1 mm]. Monday Light Showers with a high near 92°F [33°C]. S wind to around 10 mph [16 kph], with gusts to near 28 mph [45 kph]. Dewpoint near 71°F [22°C] with humidity of 96%. Pressure around 29.31 in [992.5 mb]. UV Index: 7.75. Chance of precipitation 15% with QPF of 0.25 in [6.4 mm]. Monday Night Light Showers with a low around 69°F [20°C]. S wind to around 10 mph [16 kph], with gusts to near 28 mph [45 kph]. Chance of precipitation 15% with QPF of 0.25 in [6.4 mm]. Tuesday Overcast with a high near 86°F [30°C]. WNW wind to around 19 mph [31 kph], with gusts to near 36 mph [58 kph]. Dewpoint near 71°F [22°C] with humidity of 77%. Pressure around 29.31 in [992.5 mb]. UV Index: 7. Chance of precipitation 18% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 66°F [19°C]. WNW wind to around 19 mph [31 kph], with gusts to near 36 mph [58 kph]. Chance of precipitation 18% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 70°F [21°C]. NNE wind to around 14 mph [22 kph], with gusts to near 28 mph [45 kph]. Dewpoint near 71°F [22°C] with humidity of 87%. Pressure around 29.31 in [992.5 mb]. UV Index: 7.5. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 52°F [11°C]. NNE wind to around 14 mph [22 kph], with gusts to near 28 mph [45 kph]. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Marietta, IL

Tonight: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 1.1 mm | 0.04 in

Saturday Night: 1.1 mm | 0.04 in

Sunday: 0.1 mm | 0.00 in

Sunday Night: 0.1 mm | 0.00 in

Monday: 6.4 mm | 0.25 in

Monday Night: 6.4 mm | 0.25 in

Tuesday: 0.0 mm | 0.00 in

Tuesday Night: 0.0 mm | 0.00 in

Wednesday: 0.0 mm | 0.00 in

Wednesday Night: 0.0 mm | 0.00 in

7 Day and Night - Maximum Wind Speed Forecast for Marietta, IL

Tonight: WSW @ 10 kph | 6 mph

Friday: WSW @ 17 kph | 10 mph

Friday Night: WSW @ 17 kph | 10 mph

Saturday: W @ 23 kph | 14 mph

Saturday Night: W @ 23 kph | 14 mph

Sunday: E @ 15 kph | 9 mph

Sunday Night: E @ 15 kph | 9 mph

Monday: S @ 16 kph | 10 mph

Monday Night: S @ 16 kph | 10 mph

Tuesday: WNW @ 31 kph | 19 mph

Tuesday Night: WNW @ 31 kph | 19 mph

Wednesday: NNE @ 22 kph | 14 mph

Wednesday Night: NNE @ 22 kph | 14 mph

7 Day and Night - Maximum Humidity Forecast for Marietta, IL

Tonight: 96 %

Friday: 93 %

Friday Night: 93 %

Saturday: 95 %

Saturday Night: 95 %

Sunday: 96 %

Sunday Night: 96 %

Monday: 96 %

Monday Night: 96 %

Tuesday: 77 %

Tuesday Night: 77 %

Wednesday: 87 %

Wednesday Night: 87 %

7 Day and Night - Snowfall Totals Forecast for Marietta, IL

Tonight: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

Monday: 0.0 cm | 0.00 in

Monday Night: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

Wednesday: 0.0 cm | 0.00 in

Wednesday Night: 0.0 cm | 0.00 in

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