Weather World
Simpson Lake, IL 14 Day Weather
Quick Weather Clicks
Settings
Sun & Moon
Simpson Lake, IL Weather Forecast
Simpson Lake, IL Weather Forecast Dated: 652 PM Sat Sep 19 2026
Expect a mild stretch with a mix of sun and clouds and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate.
Saturday, September 19, 2026
Mid-Morning
81°F 27°C
Sunny
Mid-Afternoon
98°F 37°C
Sunny
Early-Evening
90°F 32°C
Cloudy
Very hot with temperatures reaching 98°F 37°C, sunny through the afternoon, turning overcast this evening, with lower humidity and barometric pressure falling. Winds turning from the WSW to the SW at 5 mph 8 km/h.
Sunday, September 20, 2026
Mid-Morning
80°F 27°C
Overcast
Mid-Afternoon
97°F 36°C
Overcast
Early-Evening
87°F 31°C
Overcast
Hot and sweltering around 97°F 36°C, overcast throughout the day, with steady humidity and steady pressure. Winds switching from the W to the NE at 4 mph 7 km/h.
Monday, September 21, 2026
Mid-Morning
70°F 21°C
Cloudy
Mid-Afternoon
84°F 29°C
Overcast
Early-Evening
72°F 23°C
Light Showers
Quite warm around 84°F 29°C, dry most of the day, with showers developing late, with steady humidity and steady pressure. Winds moving from the NNE to the N at 5 mph 8 km/h.
Tuesday, September 22, 2026
Mid-Morning
65°F 19°C
Sunny
Mid-Afternoon
81°F 27°C
Partly Cloudy
Early-Evening
74°F 23°C
Overcast
Warm temperatures up to 81°F 27°C, sunny in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds out of the N at 8 mph 13 km/h.
Wednesday, September 23, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
76°F 25°C
Cloudy
Early-Evening
71°F 22°C
Cloudy
Mild with a high of 76°F 25°C, sunny in the morning, overcast in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds blowing from the N at 12 mph 19 km/h.
Thursday, September 24, 2026
Mid-Morning
61°F 16°C
Fog
Mid-Afternoon
76°F 24°C
Sunny
Early-Evening
69°F 21°C
Sunny
Pleasant near 76°F 24°C, partly cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure.
Friday, September 25, 2026
Mid-Morning
65°F 18°C
Light Fog
Mid-Afternoon
76°F 25°C
Overcast
Early-Evening
72°F 22°C
Overcast
Comfortable with temperatures reaching 76°F 25°C, cloudy in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure.
Saturday, September 26, 2026
Mid-Morning
62°F 17°C
Scattered Showers
Mid-Afternoon
76°F 24°C
Sunny
Early-Evening
69°F 21°C
Sunny
Enjoyable around 76°F 24°C, scattered downpours possible, with lower humidity and steady pressure. Winds ENE at 8 mph 13 km/h.
Sunday, September 27, 2026
Mid-Morning
56°F 13°C
Overcast
Mid-Afternoon
57°F 14°C
Light Showers
Early-Evening
69°F 21°C
Scattered Showers
Brisk around 57°F 14°C, locally heavy downpours at times, with lower humidity and steady pressure.
Monday, September 28, 2026
Mid-Morning
69°F 20°C
Sunny
Mid-Afternoon
83°F 29°C
Sunny
Early-Evening
76°F 25°C
Sunny
Very warm with a high of 83°F 29°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure.
Tuesday, September 29, 2026
Mid-Morning
68°F 20°C
Overcast
Mid-Afternoon
72°F 22°C
Overcast
Early-Evening
65°F 18°C
Overcast
Pleasant near 72°F 22°C, overcast throughout the day, with increasing humidity and steady pressure.
Wednesday, September 30, 2026
Mid-Morning
61°F 16°C
Light Showers
Mid-Afternoon
67°F 19°C
Scattered Showers
Early-Evening
66°F 19°C
Overcast
Cool with a high near 67°F 19°C, locally heavy downpours at times, with lower humidity and steady pressure.
Thursday, October 1, 2026
Mid-Morning
61°F 16°C
Cloudy
Mid-Afternoon
72°F 22°C
Overcast
Early-Evening
70°F 21°C
Overcast
Enjoyable around 72°F 22°C, overcast throughout the day, with lower humidity and steady pressure.
Friday, October 2, 2026
Mid-Morning
62°F 17°C
Sunny
Mid-Afternoon
74°F 23°C
Sunny
Early-Evening
66°F 19°C
Partly Cloudy
Mild temperatures up to 74°F 23°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure.
Simpson Lake, IL Weather Radar Map
Use the map search tool if you want to place a location marker on the radar map...