Sullivan, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 80°F 27°C Heat Index: 84°F	Observed at: Sullivan, IL	Elevation: 688 ft | 210 m
	Last Updated: July 27, 8:30 PM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 80°F | 27°C
	Pressure: 29.03 in | 983.2 mb	Dewpoint: 72°F | 22°C
	Humidity: 76%	Wind: SSW 3 mph | SSW 5 kph
	Feels Like: 87°F | 31°C	Visibility: 30.4 mi | 48.9 km
	Lat/Long: 39.5994 | -88.6078	Sunrise: 5:49 AM   Sunset: 8:12 PM

7 Day Graphical Forecast

Valid: 11:29 AM 7/28/2026

Tonight Overcast 74 °F 28% Chance Precipitation Tuesday Overcast 88 |70 °F 4% Chance Precipitation Wednesday Overcast 81 |62 °F 0% Chance Precipitation Thursday Overcast 84 |63 °F 2% Chance Precipitation Friday Heavy Showers 73 |65 °F 39% Chance Precipitation Saturday Light Drizzle 77 |62 °F 44% Chance Precipitation Sunday Light Drizzle 82 |62 °F 18% Chance Precipitation

7 Hour Graphical Forecast

Valid: 11:29 AM 7/28/2026

11 AM Clear 85 °F 1% Chance Precipitation

12 PM Clear 86 °F 1% Chance Precipitation

1 PM Partly Cloudy 86 °F 1% Chance Precipitation

2 PM Overcast 87 °F 1% Chance Precipitation

3 PM Overcast 88 °F 1% Chance Precipitation

4 PM Clear 88 °F 1% Chance Precipitation

5 PM Mostly Clear 86 °F 1% Chance Precipitation

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

7 Day & Night Weather Forecast for Sullivan, IL - (Fahrenheit & Celsius) Valid: 11:29 AM 7/28/2026 Tonight Overcast with a low around 74°F [24°C]. SW wind to around 15 mph [24 kph], with gusts to near 27 mph [43 kph]. Chance of precipitation 28% with QPF of 0.00 in [0.0 mm]. Tuesday Overcast with a high near 88°F [31°C]. N wind to around 13 mph [21 kph], with gusts to near 21 mph [33 kph]. Dewpoint near 72°F [22°C] with humidity of 91%. Pressure around 29.03 in [983.2 mb]. UV Index: 6.95. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 70°F [21°C]. N wind to around 13 mph [21 kph], with gusts to near 21 mph [33 kph]. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 81°F [27°C]. NNE wind to around 11 mph [17 kph], with gusts to near 22 mph [35 kph]. Dewpoint near 72°F [22°C] with humidity of 86%. Pressure around 29.03 in [983.2 mb]. UV Index: 7.55. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 62°F [16°C]. NNE wind to around 11 mph [17 kph], with gusts to near 22 mph [35 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 84°F [29°C]. SSW wind to around 8 mph [13 kph], with gusts to near 8 mph [12 kph]. Dewpoint near 72°F [22°C] with humidity of 87%. Pressure around 29.03 in [983.2 mb]. UV Index: 7.55. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 63°F [17°C]. SSW wind to around 8 mph [13 kph], with gusts to near 8 mph [12 kph]. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Friday Heavy Showers with a high near 73°F [23°C]. ESE wind to around 13 mph [20 kph], with gusts to near 21 mph [33 kph]. Dewpoint near 72°F [22°C] with humidity of 99%. Pressure around 29.03 in [983.2 mb]. UV Index: 1.45. Chance of precipitation 39% with QPF of 2.51 in [63.8 mm]. Friday Night Heavy Showers with a low around 65°F [18°C]. ESE wind to around 13 mph [20 kph], with gusts to near 21 mph [33 kph]. Chance of precipitation 39% with QPF of 2.51 in [63.8 mm]. Saturday Light Drizzle with a high near 77°F [25°C]. NE wind to around 10 mph [17 kph], with gusts to near 18 mph [29 kph]. Dewpoint near 72°F [22°C] with humidity of 99%. Pressure around 29.03 in [983.2 mb]. UV Index: 5.35. Chance of precipitation 44% with QPF of 0.04 in [0.9 mm]. Saturday Night Light Drizzle with a low around 62°F [17°C]. NE wind to around 10 mph [17 kph], with gusts to near 18 mph [29 kph]. Chance of precipitation 44% with QPF of 0.04 in [0.9 mm]. Sunday Light Drizzle with a high near 82°F [28°C]. NNE wind to around 11 mph [17 kph], with gusts to near 15 mph [24 kph]. Dewpoint near 72°F [22°C] with humidity of 97%. Pressure around 29.03 in [983.2 mb]. UV Index: 7.25. Chance of precipitation 18% with QPF of 0.02 in [0.6 mm]. Sunday Night Light Drizzle with a low around 62°F [17°C]. NNE wind to around 11 mph [17 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 18% with QPF of 0.02 in [0.6 mm].

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7 Day and Night - QPF Forecast for Sullivan, IL

Tonight: 0.0 mm | 0.00 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

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 63.8 mm | 2.51 in

Friday Night: 63.8 mm | 2.51 in

Saturday: 0.9 mm | 0.04 in

Saturday Night: 0.9 mm | 0.04 in

Sunday: 0.6 mm | 0.02 in

Sunday Night: 0.6 mm | 0.02 in

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

Tonight: SW @ 24 kph | 15 mph

Tuesday: N @ 21 kph | 13 mph

Tuesday Night: N @ 21 kph | 13 mph

Wednesday: NNE @ 17 kph | 11 mph

Wednesday Night: NNE @ 17 kph | 11 mph

Thursday: SSW @ 13 kph | 8 mph

Thursday Night: SSW @ 13 kph | 8 mph

Friday: ESE @ 20 kph | 13 mph

Friday Night: ESE @ 20 kph | 13 mph

Saturday: NE @ 17 kph | 10 mph

Saturday Night: NE @ 17 kph | 10 mph

Sunday: NNE @ 17 kph | 11 mph

Sunday Night: NNE @ 17 kph | 11 mph

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

Tonight: 96 %

Tuesday: 91 %

Tuesday Night: 91 %

Wednesday: 86 %

Wednesday Night: 86 %

Thursday: 87 %

Thursday Night: 87 %

Friday: 99 %

Friday Night: 99 %

Saturday: 99 %

Saturday Night: 99 %

Sunday: 97 %

Sunday Night: 97 %

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

Tonight: 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

Thursday: 0.0 cm | 0.00 in

Thursday Night: 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

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