Flat Lake, IL 14 Day Weather
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Flat Lake, IL Weather Forecast


Flat Lake, IL Weather Forecast Dated: 429 PM Sun Sep 20 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.
Sunday, September 20, 2026
Mid-Morning
78°F 26°C
Cloudy
Mid-Afternoon
93°F 34°C
Overcast
Early-Evening
83°F 28°C
Overcast
Very hot with temperatures reaching 93°F 34°C, cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds turning from the W to the NE at 9 mph 14 km/h.
Monday, September 21, 2026
Mid-Morning
69°F 20°C
Scattered Showers
Mid-Afternoon
69°F 21°C
Scattered Showers
Early-Evening
66°F 19°C
Overcast
Comfortable with temperatures reaching 69°F 21°C, scattered downpours possible, with steady humidity and steady pressure. Winds blowing from the NNE at 9 mph 14 km/h.
Tuesday, September 22, 2026
Mid-Morning
61°F 16°C
Overcast
Mid-Afternoon
68°F 20°C
Cloudy
Early-Evening
62°F 17°C
Overcast
Enjoyable around 68°F 20°C, overcast in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure. Winds moving from the NE to the NNE at 10 mph 17 km/h.
Wednesday, September 23, 2026
Mid-Morning
60°F 16°C
Sunny
Mid-Afternoon
75°F 24°C
Sunny
Early-Evening
69°F 21°C
Sunny
Mild temperatures up to 75°F 24°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds swinging from the NNE to the ENE at 10 mph 17 km/h.
Thursday, September 24, 2026
Mid-Morning
61°F 16°C
Sunny
Mid-Afternoon
76°F 24°C
Cloudy
Early-Evening
69°F 21°C
Overcast
Mild with a high of 76°F 24°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure. Winds shifting from the NE to the ENE at 10 mph 16 km/h.
Friday, September 25, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
76°F 24°C
Overcast
Early-Evening
70°F 22°C
Overcast
Pleasant near 76°F 24°C, partly cloudy in the morning, becoming overcast through the afternoon and evening, with lower humidity and barometric pressure falling. Winds E at 8 mph 13 km/h.
Saturday, September 26, 2026
Mid-Morning
60°F 16°C
Overcast
Mid-Afternoon
69°F 20°C
Overcast
Early-Evening
66°F 19°C
Overcast
Comfortable with temperatures reaching 69°F 20°C, overcast throughout the day, with lower humidity and steady pressure. Winds out of the SE at 8 mph 13 km/h.
Sunday, September 27, 2026
Mid-Morning
65°F 18°C
Partly Cloudy
Mid-Afternoon
78°F 26°C
Overcast
Early-Evening
70°F 21°C
Overcast
Enjoyable around 78°F 26°C, partly cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds moving from the E to the ENE at 8 mph 13 km/h.
Monday, September 28, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
80°F 26°C
Sunny
Early-Evening
72°F 22°C
Sunny
Warm temperatures up to 80°F 26°C, sunny throughout the day, with lower humidity and barometric pressure falling.
Tuesday, September 29, 2026
Mid-Morning
68°F 20°C
Sunny
Mid-Afternoon
84°F 29°C
Overcast
Early-Evening
75°F 24°C
Overcast
Very warm with a high of 84°F 29°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and barometric pressure falling. Winds swinging from the SE to the WSW at 10 mph 15 km/h.
Wednesday, September 30, 2026
Mid-Morning
64°F 18°C
Scattered Showers
Mid-Afternoon
74°F 23°C
Cloudy
Early-Evening
68°F 20°C
Overcast
Pleasant near 74°F 23°C, scattered downpours possible, with steady humidity and steady pressure.
Thursday, October 1, 2026
Mid-Morning
51°F 10°C
Scattered Showers
Mid-Afternoon
60°F 16°C
Cloudy
Early-Evening
55°F 13°C
Sunny
Cool with a high near 60°F 16°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds shifting from the NW to the WNW at 12 mph 19 km/h. Gusts up to 21 mph 34 km/h.
Friday, October 2, 2026
Mid-Morning
49°F 9°C
Sunny
Mid-Afternoon
64°F 18°C
Sunny
Early-Evening
57°F 14°C
Sunny
Refreshing around 64°F 18°C, sunny throughout the day, with lower humidity and steady pressure. Winds blowing from the WNW at 14 mph 22 km/h.
Saturday, October 3, 2026
Mid-Morning
55°F 13°C
Overcast
Mid-Afternoon
75°F 24°C
Sunny
Early-Evening
68°F 20°C
Overcast
Mild temperatures up to 75°F 24°C, overcast in the morning, becoming cloudy through the afternoon and evening, with steady humidity and barometric pressure falling. Winds switching from the SSW to the W at 12 mph 19 km/h. Gusts up to 25 mph 40 km/h.
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