Weather WorldFlat Lake, IL 14 Day Weather
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Flat Lake, IL Weather Forecast
Flat Lake, IL Weather Forecast Dated: 1144 PM Thu Nov 12 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and a stable pattern will dominate.
Thursday, November 12, 2026
Mid-Morning
47°F 8°C
Partly Cloudy
Mid-Afternoon
47°F 8°C
Overcast
Early-Evening
42°F 5°C
Partly Cloudy
Brisk around 47°F 8°C, partly cloudy in the morning, overcast in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds out of the NNW at 15 mph 24 km/h. Gusts up to 24 mph 39 km/h.
Friday, November 13, 2026
Mid-Morning
38°F 3°C
Partly Cloudy
Mid-Afternoon
43°F 6°C
Partly Cloudy
Early-Evening
38°F 4°C
Partly Cloudy
Biting cold near 43°F 6°C, cloudy throughout the day, with steady humidity and steady pressure. Winds switching from the NNW to the N at 7 mph 11 km/h.
Saturday, November 14, 2026
Mid-Morning
38°F 3°C
Sunny
Mid-Afternoon
47°F 8°C
Sunny
Early-Evening
38°F 3°C
Clear
Chilly near 47°F 8°C, sunny throughout the day, with steady humidity and steady pressure.
Sunday, November 15, 2026
Mid-Morning
41°F 5°C
Cloudy
Mid-Afternoon
51°F 11°C
Partly Cloudy
Early-Evening
40°F 5°C
Clear
Crisp with a high near 51°F 11°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure.
Monday, November 16, 2026
Mid-Morning
43°F 6°C
Sunny
Mid-Afternoon
54°F 12°C
Sunny
Early-Evening
43°F 6°C
Clear
Brisk around 54°F 12°C, sunny throughout the day, with steady humidity and steady pressure.
Tuesday, November 17, 2026
Mid-Morning
44°F 7°C
Sunny
Mid-Afternoon
55°F 13°C
Sunny
Early-Evening
44°F 7°C
Clear
Cool and brisk at 55°F 13°C, sunny throughout the day, with steady humidity and barometric pressure falling.
Wednesday, November 18, 2026
Mid-Morning
48°F 9°C
Cloudy
Mid-Afternoon
57°F 14°C
Cloudy
Early-Evening
51°F 11°C
Partly Cloudy
Chilly near 57°F 14°C, cloudy through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds SSE at 10 mph 17 km/h. Gusts up to 24 mph 37 km/h.
Thursday, November 19, 2026
Mid-Morning
56°F 13°C
Scattered Showers
Mid-Afternoon
62°F 17°C
Partly Cloudy
Early-Evening
56°F 13°C
Partly Cloudy
Cool with a high near 62°F 17°C, scattered downpours possible, with increasing humidity and steady pressure. Winds swinging from the SSW to the S at 4 mph 6 km/h.
Friday, November 20, 2026
Mid-Morning
58°F 14°C
Scattered Showers
Mid-Afternoon
63°F 17°C
Partly Cloudy
Early-Evening
56°F 13°C
Partly Cloudy
Refreshing around 63°F 17°C, locally heavy downpours at times, with steady humidity and steady pressure.
Saturday, November 21, 2026
Mid-Morning
57°F 14°C
Cloudy
Mid-Afternoon
63°F 17°C
Cloudy
Early-Evening
57°F 14°C
Cloudy
Mildly cool near 63°F 17°C, cloudy throughout the day, with steady humidity and barometric pressure falling.
Sunday, November 22, 2026
Mid-Morning
56°F 13°C
Partly Cloudy
Mid-Afternoon
62°F 17°C
Overcast
Early-Evening
59°F 15°C
Overcast
Comfortable at 62°F 17°C, partly cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds shifting from the SE to the SSE at 8 mph 12 km/h. Gusts up to 20 mph 32 km/h.
Monday, November 23, 2026
Mid-Morning
56°F 13°C
Light Rain
Mid-Afternoon
56°F 13°C
Drizzle
Early-Evening
54°F 12°C
Light Rain
Crisp with a high near 56°F 13°C, on-and-off showers throughout the day, with steady humidity and barometric pressure falling. Winds turning from the SSE to the SE at 9 mph 14 km/h. Gusts up to 22 mph 35 km/h.
Tuesday, November 24, 2026
Mid-Morning
50°F 10°C
Scattered Showers
Mid-Afternoon
50°F 10°C
Scattered Showers
Early-Evening
46°F 8°C
Partly Cloudy
Brisk around 50°F 10°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds out of the NW at 7 mph 12 km/h. Gusts up to 25 mph 40 km/h.
Wednesday, November 25, 2026
Mid-Morning
42°F 6°C
Sunny
Mid-Afternoon
47°F 8°C
Partly Cloudy
Early-Evening
42°F 6°C
Partly Cloudy
Cool and brisk at 47°F 8°C, partly cloudy throughout the day, with steady humidity and steady pressure. Winds moving from the WNW to the W at 5 mph 9 km/h. Gusts up to 20 mph 32 km/h.
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