Flat Lake, IL 14 Day Weather

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Flat Lake, IL Weather - 14-Day Weather Forecast

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Flat Lake IL Weather - Overcast - 90°F
Overcast
90°F
Updated 4:29 pm
Feels Like 92°F
Humidity 46%
Wind NE 7 mph
Barometer  29.84 in
Dew Point 67°F
Flat Lake IL Weather - Overcast - 32°C
Overcast
32°C
Updated 4:29 pm
Feels Like 34°C
Humidity 46%
Wind NE 11 km/h
Barometer  101 kPa
Dew Point 19°C
Flat Lake, IL Weather and Current Conditionsflat lake il weather forecast

Flat Lake, IL Weather Forecast

Flat Lake Illinois WeatherFlat Lake, Illinois Weather Weather Forecast
14 day API weather forecast for Flat Lake. Note: The 7-day Flat Lake weather forecast is the most reliable and accurate weather forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days ahead.
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
Flat Lake Weather - 2026-09-20 - Morning - Cloudy
78°F 26°C
Cloudy
Mid-Afternoon
Flat Lake Weather - 2026-09-20 - Afternoon - Overcast
93°F 34°C
Overcast
Early-Evening
Flat Lake Weather - 2026-09-20 - Evening - Overcast
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
Flat Lake Weather - 2026-09-21 - Morning - Scattered Showers
69°F 20°C
Scattered Showers
Mid-Afternoon
Flat Lake Weather - 2026-09-21 - Afternoon - Scattered Showers
69°F 21°C
Scattered Showers
Early-Evening
Flat Lake Weather - 2026-09-21 - Evening - Overcast
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
Flat Lake Weather - 2026-09-22 - Morning - Overcast
61°F 16°C
Overcast
Mid-Afternoon
Flat Lake Weather - 2026-09-22 - Afternoon - Cloudy
68°F 20°C
Cloudy
Early-Evening
Flat Lake Weather - 2026-09-22 - Evening - Overcast
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
Flat Lake Weather - 2026-09-23 - Morning - Sunny
60°F 16°C
Sunny
Mid-Afternoon
Flat Lake Weather - 2026-09-23 - Afternoon - Sunny
75°F 24°C
Sunny
Early-Evening
Flat Lake Weather - 2026-09-23 - Evening - Sunny
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
Flat Lake Weather - 2026-09-24 - Morning - Sunny
61°F 16°C
Sunny
Mid-Afternoon
Flat Lake Weather - 2026-09-24 - Afternoon - Cloudy
76°F 24°C
Cloudy
Early-Evening
Flat Lake Weather - 2026-09-24 - Evening - Overcast
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
Flat Lake Weather - 2026-09-25 - Morning - Sunny
63°F 17°C
Sunny
Mid-Afternoon
Flat Lake Weather - 2026-09-25 - Afternoon - Overcast
76°F 24°C
Overcast
Early-Evening
Flat Lake Weather - 2026-09-25 - Evening - Overcast
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
Flat Lake Weather - 2026-09-26 - Morning - Overcast
60°F 16°C
Overcast
Mid-Afternoon
Flat Lake Weather - 2026-09-26 - Afternoon - Overcast
69°F 20°C
Overcast
Early-Evening
Flat Lake Weather - 2026-09-26 - Evening - Overcast
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
Flat Lake Weather - 2026-09-27 - Morning - Partly Cloudy
65°F 18°C
Partly Cloudy
Mid-Afternoon
Flat Lake Weather - 2026-09-27 - Afternoon - Overcast
78°F 26°C
Overcast
Early-Evening
Flat Lake Weather - 2026-09-27 - Evening - Overcast
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
Flat Lake Weather - 2026-09-28 - Morning - Sunny
63°F 17°C
Sunny
Mid-Afternoon
Flat Lake Weather - 2026-09-28 - Afternoon - Sunny
80°F 26°C
Sunny
Early-Evening
Flat Lake Weather - 2026-09-28 - Evening - Sunny
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
Flat Lake Weather - 2026-09-29 - Morning - Sunny
68°F 20°C
Sunny
Mid-Afternoon
Flat Lake Weather - 2026-09-29 - Afternoon - Overcast
84°F 29°C
Overcast
Early-Evening
Flat Lake Weather - 2026-09-29 - Evening - Overcast
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
Flat Lake Weather - 2026-09-30 - Morning - Scattered Showers
64°F 18°C
Scattered Showers
Mid-Afternoon
Flat Lake Weather - 2026-09-30 - Afternoon - Cloudy
74°F 23°C
Cloudy
Early-Evening
Flat Lake Weather - 2026-09-30 - Evening - Overcast
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
Flat Lake Weather - 2026-10-01 - Morning - Scattered Showers
51°F 10°C
Scattered Showers
Mid-Afternoon
Flat Lake Weather - 2026-10-01 - Afternoon - Cloudy
60°F 16°C
Cloudy
Early-Evening
Flat Lake Weather - 2026-10-01 - Evening - Sunny
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
Flat Lake Weather - 2026-10-02 - Morning - Sunny
49°F 9°C
Sunny
Mid-Afternoon
Flat Lake Weather - 2026-10-02 - Afternoon - Sunny
64°F 18°C
Sunny
Early-Evening
Flat Lake Weather - 2026-10-02 - Evening - Sunny
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
Flat Lake Weather - 2026-10-03 - Morning - Overcast
55°F 13°C
Overcast
Mid-Afternoon
Flat Lake Weather - 2026-10-03 - Afternoon - Sunny
75°F 24°C
Sunny
Early-Evening
Flat Lake Weather - 2026-10-03 - Evening - Overcast
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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Weather by the Numbers

Sun, 20th
Flat Lake IL Weather - Sunday, Sep 20, 2026 - Partly Cloudy
Hi: 93°F 34°C
Lo: 69°F 20°C
Sunrise 06:48 AM
Sunset 07:02 PM
Wind SW 1 mph1 km/h
Dew Point 61°F16°C
uv Index 6
Barometric Pressure 29.85 in1011 mb
POP 3% *
Humidity 40%
Mon, 21st
Flat Lake IL Weather - Monday, Sep 21, 2026 - Patchy Rain Nearby
Hi: 70°F 21°C
Lo: 63°F 17°C
Sunrise 06:49 AM
Sunset 07:01 PM
Wind NNW 6 mph10 km/h
Dew Point 65°F18°C
uv Index 2
Barometric Pressure 30 in1016 mb
POP 31% *
Humidity 86%
Tue, 22nd
Flat Lake IL Weather - Tuesday, Sep 22, 2026 - Overcast
Hi: 68°F 20°C
Lo: 60°F 15°C
Sunrise 06:50 AM
Sunset 06:59 PM
Wind NE 9 mph15 km/h
Dew Point 54°F12°C
uv Index 3
Barometric Pressure 30.18 in1022 mb
POP 18% *
Humidity 70%
Wed, 23rd
Flat Lake IL Weather - Wednesday, Sep 23, 2026 - Sunny
Hi: 75°F 24°C
Lo: 54°F 12°C
Sunrise 06:51 AM
Sunset 06:57 PM
Wind NE 9 mph14 km/h
Dew Point 51°F10°C
uv Index 6
Barometric Pressure 30.27 in1025 mb
POP 2% *
Humidity 48%
Thu, 24th
Flat Lake IL Weather - Thursday, Sep 24, 2026 - Partly Cloudy
Hi: 76°F 24°C
Lo: 55°F 13°C
Sunrise 06:52 AM
Sunset 06:56 PM
Wind ENE 9 mph14 km/h
Dew Point 53°F12°C
uv Index 6
Barometric Pressure 30.27 in1025 mb
POP 4% *
Humidity 52%
Fri, 25th
Flat Lake IL Weather - Friday, Sep 25, 2026 - Partly Cloudy
Hi: 76°F 25°C
Lo: 56°F 13°C
Sunrise 06:53 AM
Sunset 06:54 PM
Wind E 8 mph13 km/h
Dew Point 51°F11°C
uv Index 6
Barometric Pressure 30.24 in1024 mb
POP 8% *
Humidity 49%
Sat, 26th
Flat Lake IL Weather - Saturday, Sep 26, 2026 - Overcast
Hi: 69°F 20°C
Lo: 58°F 14°C
Sunrise 06:54 AM
Sunset 06:53 PM
Wind SE 9 mph15 km/h
Dew Point 40°F5°C
uv Index 4
Barometric Pressure 30.15 in1021 mb
POP 10% *
Humidity 39%
Sun, 27th
Flat Lake IL Weather - Sunday, Sep 27, 2026 - Sunny
Hi: 79°F 26°C
Lo: 59°F 15°C
Sunrise 06:55 AM
Sunset 06:51 PM
Wind E 7 mph11 km/h
Dew Point 40°F4°C
uv Index 6
Barometric Pressure 30.15 in1021 mb
POP 6% *
Humidity 29%
Mon, 28th
Flat Lake IL Weather - Monday, Sep 28, 2026 - Sunny
Hi: 81°F 27°C
Lo: 55°F 13°C
Sunrise 06:55 AM
Sunset 06:49 PM
Wind ESE 7 mph11 km/h
Dew Point 48°F9°C
uv Index 6
Barometric Pressure 30.12 in1020 mb
POP 1% *
Humidity 41%
Tue, 29th
Flat Lake IL Weather - Tuesday, Sep 29, 2026 - Sunny
Hi: 84°F 29°C
Lo: 59°F 15°C
Sunrise 06:56 AM
Sunset 06:48 PM
Wind S 10 mph17 km/h
Dew Point 49°F10°C
uv Index 7
Barometric Pressure 29.91 in1013 mb
POP 5% *
Humidity 36%
Wed, 30th
Flat Lake IL Weather - Wednesday, Sep 30, 2026 - Patchy Rain Nearby
Hi: 76°F 25°C
Lo: 58°F 15°C
Sunrise 06:57 AM
Sunset 06:46 PM
Wind SSW 3 mph5 km/h
Dew Point 59°F15°C
uv Index 4
Barometric Pressure 29.8 in1009 mb
POP 17% *
Humidity 73%
Thu, 1st
Flat Lake IL Weather - Thursday, Oct 1, 2026 - Cloudy
Hi: 62°F 17°C
Lo: 47°F 9°C
Sunrise 06:58 AM
Sunset 06:45 PM
Wind NW 19 mph31 km/h
Dew Point 38°F3°C
uv Index 3
Barometric Pressure 29.91 in1013 mb
POP 9% *
Humidity 52%
Fri, 2nd
Flat Lake IL Weather - Friday, Oct 2, 2026 - Sunny
Hi: 65°F 18°C
Lo: 43°F 6°C
Sunrise 06:59 AM
Sunset 06:43 PM
Wind WNW 14 mph23 km/h
Dew Point 33°F0°C
uv Index 4
Barometric Pressure 29.94 in1014 mb
POP 1% *
Humidity 38%
Sat, 3rd
Flat Lake IL Weather - Saturday, Oct 3, 2026 - Overcast
Hi: 76°F 25°C
Lo: 47°F 8°C
Sunrise 07:00 AM
Sunset 06:41 PM
Wind SSW 10 mph17 km/h
Dew Point 38°F3°C
uv Index 5
Barometric Pressure 29.88 in1012 mb
POP 3% *
Humidity 33%
* POP = Probability of Precipitation. Data for 12:00 PM.