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City of Sullivan, IllinoisSullivan, IL 14 Day Weather - 61951 WeatherWorld.com
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Sullivan, IL Weather Forecast
Sullivan, IL Weather Forecast Dated: 1113 AM Sun Sep 13 2026
Expect a mild stretch with a mix of sun and clouds and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.
Sunday, September 13, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
84°F 29°C
Cloudy
Early-Evening
71°F 22°C
Overcast
Warm and summery near 84°F 29°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure. Winds out of the N at 16 mph 25 km/h.
Monday, September 14, 2026
Mid-Morning
64°F 18°C
Overcast
Mid-Afternoon
80°F 27°C
Overcast
Early-Evening
75°F 24°C
Overcast
Balmy with temperatures reaching 80°F 27°C, overcast through the afternoon, turning cloudy this evening, with steady humidity and barometric pressure falling. Winds switching from the E to the SE at 11 mph 17 km/h. Gusts up to 23 mph 37 km/h.
Tuesday, September 15, 2026
Mid-Morning
77°F 25°C
Sunny
Mid-Afternoon
96°F 35°C
Overcast
Early-Evening
78°F 26°C
Scattered Showers
Sizzling hot with 96°F 35°C, locally heavy downpours at times, with increasing humidity and steady pressure. Winds moving from the S to the SW at 12 mph 19 km/h. Gusts up to 22 mph 35 km/h.
Wednesday, September 16, 2026
Mid-Morning
73°F 23°C
Light Showers
Mid-Afternoon
88°F 31°C
Sunny
Early-Evening
81°F 27°C
Sunny
Warm and summery around 88°F 31°C (feels like 93°F 34°C), early showers breaking for a drier afternoon, with lower humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
70°F 21°C
Overcast
Mid-Afternoon
77°F 25°C
Scattered Showers
Early-Evening
72°F 22°C
Overcast
Mild with a high of 77°F 25°C, scattered downpours possible, with lower humidity and steady pressure. Winds swinging from the NNE to the NE at 10 mph 16 km/h.
Friday, September 18, 2026
Mid-Morning
68°F 20°C
Sunny
Mid-Afternoon
79°F 26°C
Partly Cloudy
Early-Evening
72°F 22°C
Partly Cloudy
Pleasant near 79°F 26°C, partly cloudy throughout the day, with steady humidity and barometric pressure falling. Winds shifting from the ENE to the E at 9 mph 15 km/h.
Saturday, September 19, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
88°F 31°C
Sunny
Early-Evening
84°F 29°C
Sunny
Balmy with temperatures reaching 88°F 31°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds SW at 10 mph 16 km/h.
Sunday, September 20, 2026
Mid-Morning
72°F 22°C
Light Showers
Mid-Afternoon
74°F 23°C
Light Showers
Early-Evening
71°F 21°C
Light Showers
Enjoyable around 74°F 23°C, persistent showers off and on through the day, with steady humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
64°F 18°C
Light Showers
Mid-Afternoon
68°F 20°C
Light Showers
Early-Evening
62°F 17°C
Light Showers
Mild temperatures up to 68°F 20°C, on-and-off showers throughout the day, with steady humidity and steady pressure. Winds switching from the E to the NNE at 9 mph 15 km/h.
Tuesday, September 22, 2026
Mid-Morning
54°F 12°C
Scattered Showers
Mid-Afternoon
54°F 12°C
Scattered Showers
Early-Evening
51°F 11°C
Scattered Showers
Cool and brisk at 54°F 12°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds blowing from the WNW at 14 mph 23 km/h. Gusts up to 26 mph 42 km/h.
Wednesday, September 23, 2026
Mid-Morning
51°F 11°C
Scattered Showers
Mid-Afternoon
56°F 13°C
Overcast
Early-Evening
53°F 12°C
Scattered Showers
Chilly near 56°F 13°C, scattered downpours possible, with lower humidity and steady pressure. Winds NW at 17 mph 28 km/h. Gusts up to 27 mph 43 km/h.
Thursday, September 24, 2026
Mid-Morning
54°F 12°C
Overcast
Mid-Afternoon
62°F 17°C
Scattered Showers
Early-Evening
59°F 16°C
Scattered Showers
Cool with a high near 62°F 17°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds shifting from the NNW to the NNE at 10 mph 16 km/h. Gusts up to 21 mph 33 km/h.
Friday, September 25, 2026
Mid-Morning
58°F 15°C
Light Fog
Mid-Afternoon
69°F 20°C
Sunny
Early-Evening
63°F 17°C
Sunny
Enjoyable around 69°F 20°C, sunny throughout the day, with steady humidity and steady pressure. Winds turning from the NNE to the ENE at 8 mph 13 km/h.
Saturday, September 26, 2026
Mid-Morning
61°F 16°C
Sunny
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
66°F 19°C
Sunny
Mild temperatures up to 73°F 23°C, sunny throughout the day, with steady humidity and steady pressure.
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