Illiopolis, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 77°F 25°C Heat Index: 77°F	Observed at: Illiopolis, IL	Elevation: 721 ft | 220 m
	Last Updated: July 16, 10:30 PM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 77°F | 25°C
	Pressure: 29.37 in | 994.7 mb	Dewpoint: 72°F | 22°C
	Humidity: 83%	Wind: E 2 mph | E 3 kph
	Feels Like: 85°F | 29°C	Visibility: 34.2 mi | 55.1 km
	Lat/Long: 39.8536 | -89.2419	Sunrise: 5:42 AM   Sunset: 8:23 PM

7 Day Graphical Forecast

Valid: 10:36 PM 7/16/2026

Tonight Overcast 70 °F 12% Chance Precipitation Friday Overcast 90 |74 °F 28% Chance Precipitation Saturday Drizzle 93 |75 °F 43% Chance Precipitation Sunday Drizzle 83 |69 °F 26% Chance Precipitation Monday Light Showers 88 |69 °F 10% Chance Precipitation Tuesday Overcast 87 |68 °F 15% Chance Precipitation Wednesday Partly Cloudy 71 |52 °F 3% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:36 PM 7/16/2026

10 PM Clear 78 °F 2% Chance Precipitation

11 PM Clear 77 °F 5% Chance Precipitation

12 AM Clear 76 °F 5% Chance Precipitation

1 AM Clear 75 °F 5% Chance Precipitation

2 AM Clear 75 °F 4% Chance Precipitation

3 AM Clear 75 °F 4% Chance Precipitation

4 AM Clear 74 °F 5% Chance Precipitation

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

7 Day & Night Weather Forecast for Illiopolis, IL - (Fahrenheit & Celsius) Valid: 10:36 PM 7/16/2026 Tonight Overcast with a low around 70°F [21°C]. SE wind to around 5 mph [8 kph], with gusts to near 7 mph [11 kph]. Chance of precipitation 12% with QPF of 0.00 in [0.0 mm]. Friday Overcast with a high near 90°F [32°C]. WSW wind to around 11 mph [17 kph], with gusts to near 16 mph [26 kph]. Dewpoint near 72°F [22°C] with humidity of 96%. Pressure around 29.37 in [994.7 mb]. UV Index: 7.55. Chance of precipitation 28% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 74°F [23°C]. WSW wind to around 11 mph [17 kph], with gusts to near 16 mph [26 kph]. Chance of precipitation 28% with QPF of 0.00 in [0.0 mm]. Saturday Drizzle with a high near 93°F [34°C]. W wind to around 15 mph [25 kph], with gusts to near 29 mph [47 kph]. Dewpoint near 72°F [22°C] with humidity of 94%. Pressure around 29.37 in [994.7 mb]. UV Index: 7.7. Chance of precipitation 43% with QPF of 0.07 in [1.7 mm]. Saturday Night Drizzle with a low around 75°F [24°C]. W wind to around 15 mph [25 kph], with gusts to near 29 mph [47 kph]. Chance of precipitation 43% with QPF of 0.07 in [1.7 mm]. Sunday Drizzle with a high near 83°F [28°C]. E wind to around 8 mph [12 kph], with gusts to near 16 mph [25 kph]. Dewpoint near 72°F [22°C] with humidity of 96%. Pressure around 29.37 in [994.7 mb]. UV Index: 7.7. Chance of precipitation 26% with QPF of 0.06 in [1.5 mm]. Sunday Night Drizzle with a low around 69°F [20°C]. E wind to around 8 mph [12 kph], with gusts to near 16 mph [25 kph]. Chance of precipitation 26% with QPF of 0.06 in [1.5 mm]. Monday Light Showers with a high near 88°F [31°C]. S wind to around 10 mph [17 kph], with gusts to near 27 mph [44 kph]. Dewpoint near 72°F [22°C] with humidity of 92%. Pressure around 29.37 in [994.7 mb]. UV Index: 7.65. Chance of precipitation 10% with QPF of 0.19 in [4.8 mm]. Monday Night Light Showers with a low around 69°F [21°C]. S wind to around 10 mph [17 kph], with gusts to near 27 mph [44 kph]. Chance of precipitation 10% with QPF of 0.19 in [4.8 mm]. Tuesday Overcast with a high near 87°F [31°C]. WNW wind to around 19 mph [31 kph], with gusts to near 36 mph [58 kph]. Dewpoint near 72°F [22°C] with humidity of 84%. Pressure around 29.37 in [994.7 mb]. UV Index: 7.1. Chance of precipitation 15% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 68°F [20°C]. WNW wind to around 19 mph [31 kph], with gusts to near 36 mph [58 kph]. Chance of precipitation 15% with QPF of 0.00 in [0.0 mm]. Wednesday Partly Cloudy with a high near 71°F [22°C]. NNE wind to around 13 mph [21 kph], with gusts to near 27 mph [43 kph]. Dewpoint near 72°F [22°C] with humidity of 88%. Pressure around 29.37 in [994.7 mb]. UV Index: 7.5. Chance of precipitation 3% with QPF of 0.00 in [0.0 mm]. Wednesday Night Partly Cloudy with a low around 52°F [11°C]. NNE wind to around 13 mph [21 kph], with gusts to near 27 mph [43 kph]. Chance of precipitation 3% with QPF of 0.00 in [0.0 mm].

---

7 Day and Night - QPF Forecast for Illiopolis, IL

Tonight: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 1.7 mm | 0.07 in

Saturday Night: 1.7 mm | 0.07 in

Sunday: 1.5 mm | 0.06 in

Sunday Night: 1.5 mm | 0.06 in

Monday: 4.8 mm | 0.19 in

Monday Night: 4.8 mm | 0.19 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 Illiopolis, IL

Tonight: SE @ 8 kph | 5 mph

Friday: WSW @ 17 kph | 11 mph

Friday Night: WSW @ 17 kph | 11 mph

Saturday: W @ 25 kph | 15 mph

Saturday Night: W @ 25 kph | 15 mph

Sunday: E @ 12 kph | 8 mph

Sunday Night: E @ 12 kph | 8 mph

Monday: S @ 17 kph | 10 mph

Monday Night: S @ 17 kph | 10 mph

Tuesday: WNW @ 31 kph | 19 mph

Tuesday Night: WNW @ 31 kph | 19 mph

Wednesday: NNE @ 21 kph | 13 mph

Wednesday Night: NNE @ 21 kph | 13 mph

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

Tonight: 94 %

Friday: 96 %

Friday Night: 96 %

Saturday: 94 %

Saturday Night: 94 %

Sunday: 96 %

Sunday Night: 96 %

Monday: 92 %

Monday Night: 92 %

Tuesday: 84 %

Tuesday Night: 84 %

Wednesday: 88 %

Wednesday Night: 88 %

7 Day and Night - Snowfall Totals Forecast for Illiopolis, 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

Contact Us | Mobile Private Policy | Terms & Conds | Consent Preferences | Cookie Policy Never base any life decisions on weather information from this site or anywhere over the Internet. Site is dedicated to our Lord & Savior Jesus Christ | Random Quotes of Jesus Copyright © 2026 El Dorado Weather, Inc. | Site Designed By:  Webmaster Danny