Lanark, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 79°F 26°C Heat Index: 79°F	Observed at: Lanark, IL	Elevation: 1000 ft | 305 m
	Last Updated: July 16, 10:15 PM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 79°F | 26°C
	Pressure: 29.09 in | 985.1 mb	Dewpoint: 70°F | 21°C
	Humidity: 73%	Wind: ESE 4 mph | ESE 6 kph
	Feels Like: 85°F | 29°C	Visibility: 42.6 mi | 68.6 km
	Lat/Long: 42.1022 | -89.8333	Sunrise: 5:37 AM   Sunset: 8:33 PM

7 Day Graphical Forecast

Valid: 10:26 PM 7/16/2026

Tonight Overcast 70 °F 3% Chance Precipitation Friday Partly Cloudy 92 |71 °F 17% Chance Precipitation Saturday Overcast 88 |71 °F 7% Chance Precipitation Sunday Overcast 81 |63 °F 1% Chance Precipitation Monday Drizzle 82 |65 °F 33% Chance Precipitation Tuesday Light Drizzle 83 |59 °F 33% Chance Precipitation Wednesday Overcast 71 |47 °F 4% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:26 PM 7/16/2026

10 PM Clear 80 °F 3% Chance Precipitation

11 PM Clear 78 °F 3% Chance Precipitation

12 AM Clear 77 °F 0% Chance Precipitation

1 AM Clear 76 °F 0% Chance Precipitation

2 AM Clear 75 °F 0% Chance Precipitation

3 AM Clear 74 °F 1% Chance Precipitation

4 AM Clear 72 °F 2% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for Lanark, IL - (Fahrenheit & Celsius) Valid: 10:26 PM 7/16/2026 Tonight Overcast with a low around 70°F [21°C]. SSE wind to around 8 mph [13 kph], with gusts to near 13 mph [21 kph]. Chance of precipitation 3% with QPF of 0.00 in [0.0 mm]. Friday Partly Cloudy with a high near 92°F [33°C]. SSW wind to around 14 mph [23 kph], with gusts to near 19 mph [30 kph]. Dewpoint near 70°F [21°C] with humidity of 82%. Pressure around 29.09 in [985.1 mb]. UV Index: 7.5. Chance of precipitation 17% with QPF of 0.00 in [0.0 mm]. Friday Night Partly Cloudy with a low around 71°F [22°C]. SSW wind to around 14 mph [23 kph], with gusts to near 19 mph [30 kph]. Chance of precipitation 17% with QPF of 0.00 in [0.0 mm]. Saturday Overcast with a high near 88°F [31°C]. NW wind to around 14 mph [23 kph], with gusts to near 27 mph [43 kph]. Dewpoint near 70°F [21°C] with humidity of 80%. Pressure around 29.09 in [985.1 mb]. UV Index: 7.45. Chance of precipitation 7% with QPF of 0.00 in [0.0 mm]. Saturday Night Overcast with a low around 71°F [22°C]. NW wind to around 14 mph [23 kph], with gusts to near 27 mph [43 kph]. Chance of precipitation 7% with QPF of 0.00 in [0.0 mm]. Sunday Overcast with a high near 81°F [27°C]. ESE wind to around 8 mph [13 kph], with gusts to near 17 mph [28 kph]. Dewpoint near 70°F [21°C] with humidity of 97%. Pressure around 29.09 in [985.1 mb]. UV Index: 7.5. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Sunday Night Overcast with a low around 63°F [17°C]. ESE wind to around 8 mph [13 kph], with gusts to near 17 mph [28 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Monday Drizzle with a high near 82°F [28°C]. S wind to around 14 mph [23 kph], with gusts to near 34 mph [55 kph]. Dewpoint near 70°F [21°C] with humidity of 96%. Pressure around 29.09 in [985.1 mb]. UV Index: 5.65. Chance of precipitation 33% with QPF of 0.04 in [1.0 mm]. Monday Night Drizzle with a low around 65°F [18°C]. S wind to around 14 mph [23 kph], with gusts to near 34 mph [55 kph]. Chance of precipitation 33% with QPF of 0.04 in [1.0 mm]. Tuesday Light Drizzle with a high near 83°F [28°C]. NW wind to around 21 mph [33 kph], with gusts to near 34 mph [55 kph]. Dewpoint near 70°F [21°C] with humidity of 92%. Pressure around 29.09 in [985.1 mb]. UV Index: 6.75. Chance of precipitation 33% with QPF of 0.02 in [0.5 mm]. Tuesday Night Light Drizzle with a low around 59°F [15°C]. NW wind to around 21 mph [33 kph], with gusts to near 34 mph [55 kph]. Chance of precipitation 33% with QPF of 0.02 in [0.5 mm]. Wednesday Overcast with a high near 71°F [22°C]. N wind to around 14 mph [22 kph], with gusts to near 27 mph [44 kph]. Dewpoint near 70°F [21°C] with humidity of 88%. Pressure around 29.09 in [985.1 mb]. UV Index: 7.35. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 47°F [8°C]. N wind to around 14 mph [22 kph], with gusts to near 27 mph [44 kph]. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Lanark, IL

Tonight: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 0.0 mm | 0.00 in

Saturday Night: 0.0 mm | 0.00 in

Sunday: 0.0 mm | 0.00 in

Sunday Night: 0.0 mm | 0.00 in

Monday: 1.0 mm | 0.04 in

Monday Night: 1.0 mm | 0.04 in

Tuesday: 0.5 mm | 0.02 in

Tuesday Night: 0.5 mm | 0.02 in

Wednesday: 0.0 mm | 0.00 in

Wednesday Night: 0.0 mm | 0.00 in

7 Day and Night - Maximum Wind Speed Forecast for Lanark, IL

Tonight: SSE @ 13 kph | 8 mph

Friday: SSW @ 23 kph | 14 mph

Friday Night: SSW @ 23 kph | 14 mph

Saturday: NW @ 23 kph | 14 mph

Saturday Night: NW @ 23 kph | 14 mph

Sunday: ESE @ 13 kph | 8 mph

Sunday Night: ESE @ 13 kph | 8 mph

Monday: S @ 23 kph | 14 mph

Monday Night: S @ 23 kph | 14 mph

Tuesday: NW @ 33 kph | 21 mph

Tuesday Night: NW @ 33 kph | 21 mph

Wednesday: N @ 22 kph | 14 mph

Wednesday Night: N @ 22 kph | 14 mph

7 Day and Night - Maximum Humidity Forecast for Lanark, IL

Tonight: 100 %

Friday: 82 %

Friday Night: 82 %

Saturday: 80 %

Saturday Night: 80 %

Sunday: 97 %

Sunday Night: 97 %

Monday: 96 %

Monday Night: 96 %

Tuesday: 92 %

Tuesday Night: 92 %

Wednesday: 88 %

Wednesday Night: 88 %

7 Day and Night - Snowfall Totals Forecast for Lanark, IL

Tonight: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

Monday: 0.0 cm | 0.00 in

Monday Night: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

Wednesday: 0.0 cm | 0.00 in

Wednesday Night: 0.0 cm | 0.00 in

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