Lancaster, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 79°F 26°C Heat Index: 79°F	Observed at: Lancaster, IL	Elevation: 551 ft | 168 m
	Last Updated: July 16, 10:15 PM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 79°F | 26°C
	Pressure: 29.52 in | 999.8 mb	Dewpoint: 76°F | 24°C
	Humidity: 93%	Wind: W 2 mph | W 3 kph
	Feels Like: 90°F | 32°C	Visibility: 26.7 mi | 43 km
	Lat/Long: 38.5478 | -87.8653	Sunrise: 5:40 AM   Sunset: 8:14 PM

7 Day Graphical Forecast

Valid: 10:19 PM 7/16/2026

Tonight Overcast 75 °F 30% Chance Precipitation Friday Overcast 89 |74 °F 28% Chance Precipitation Saturday Mostly Clear 92 |75 °F 51% Chance Precipitation Sunday Heavy Drizzle 86 |72 °F 48% Chance Precipitation Monday Overcast 88 |68 °F 6% Chance Precipitation Tuesday Overcast 94 |68 °F 9% Chance Precipitation Wednesday Mostly Clear 73 |59 °F 6% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:19 PM 7/16/2026

10 PM Clear 79 °F 1% Chance Precipitation

11 PM Clear 78 °F 1% Chance Precipitation

12 AM Clear 77 °F 2% Chance Precipitation

1 AM Clear 77 °F 3% Chance Precipitation

2 AM Clear 76 °F 3% Chance Precipitation

3 AM Clear 76 °F 3% Chance Precipitation

4 AM Clear 75 °F 3% Chance Precipitation

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

7 Day & Night Weather Forecast for Lancaster, IL - (Fahrenheit & Celsius) Valid: 10:19 PM 7/16/2026 Tonight Overcast with a low around 75°F [24°C]. WSW wind to around 4 mph [7 kph], with gusts to near 6 mph [9 kph]. Chance of precipitation 30% with QPF of 0.00 in [0.0 mm]. Friday Overcast with a high near 89°F [32°C]. WSW wind to around 12 mph [19 kph], with gusts to near 17 mph [27 kph]. Dewpoint near 76°F [24°C] with humidity of 96%. Pressure around 29.52 in [999.8 mb]. UV Index: 7.7. Chance of precipitation 28% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 74°F [23°C]. WSW wind to around 12 mph [19 kph], with gusts to near 17 mph [27 kph]. Chance of precipitation 28% with QPF of 0.00 in [0.0 mm]. Saturday Mostly Clear with a high near 92°F [34°C]. W wind to around 16 mph [25 kph], with gusts to near 25 mph [41 kph]. Dewpoint near 76°F [24°C] with humidity of 87%. Pressure around 29.52 in [999.8 mb]. UV Index: 7.8. Chance of precipitation 51% with QPF of 0.00 in [0.1 mm]. Saturday Night Mostly Clear with a low around 75°F [24°C]. W wind to around 16 mph [25 kph], with gusts to near 25 mph [41 kph]. Chance of precipitation 51% with QPF of 0.00 in [0.1 mm]. Sunday Heavy Drizzle with a high near 86°F [30°C]. NNE wind to around 8 mph [12 kph], with gusts to near 13 mph [21 kph]. Dewpoint near 76°F [24°C] with humidity of 97%. Pressure around 29.52 in [999.8 mb]. UV Index: 7.75. Chance of precipitation 48% with QPF of 0.05 in [1.2 mm]. Sunday Night Heavy Drizzle with a low around 72°F [22°C]. NNE wind to around 8 mph [12 kph], with gusts to near 13 mph [21 kph]. Chance of precipitation 48% with QPF of 0.05 in [1.2 mm]. Monday Overcast with a high near 88°F [31°C]. SSE wind to around 9 mph [15 kph], with gusts to near 18 mph [29 kph]. Dewpoint near 76°F [24°C] with humidity of 90%. Pressure around 29.52 in [999.8 mb]. UV Index: 7.35. Chance of precipitation 6% with QPF of 0.00 in [0.0 mm]. Monday Night Overcast with a low around 68°F [20°C]. SSE wind to around 9 mph [15 kph], with gusts to near 18 mph [29 kph]. Chance of precipitation 6% with QPF of 0.00 in [0.0 mm]. Tuesday Overcast with a high near 94°F [34°C]. WSW wind to around 14 mph [23 kph], with gusts to near 30 mph [48 kph]. Dewpoint near 76°F [24°C] with humidity of 93%. Pressure around 29.52 in [999.8 mb]. UV Index: 7.25. Chance of precipitation 9% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 68°F [20°C]. WSW wind to around 14 mph [23 kph], with gusts to near 30 mph [48 kph]. Chance of precipitation 9% with QPF of 0.00 in [0.0 mm]. Wednesday Mostly Clear with a high near 73°F [23°C]. NNE wind to around 14 mph [22 kph], with gusts to near 28 mph [45 kph]. Dewpoint near 76°F [24°C] with humidity of 91%. Pressure around 29.52 in [999.8 mb]. UV Index: 7.6. Chance of precipitation 6% with QPF of 0.00 in [0.0 mm]. Wednesday Night Mostly Clear with a low around 59°F [15°C]. NNE wind to around 14 mph [22 kph], with gusts to near 28 mph [45 kph]. Chance of precipitation 6% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Lancaster, IL

Tonight: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 0.1 mm | 0.00 in

Saturday Night: 0.1 mm | 0.00 in

Sunday: 1.2 mm | 0.05 in

Sunday Night: 1.2 mm | 0.05 in

Monday: 0.0 mm | 0.00 in

Monday Night: 0.0 mm | 0.00 in

Tuesday: 0.0 mm | 0.00 in

Tuesday Night: 0.0 mm | 0.00 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 Lancaster, IL

Tonight: WSW @ 7 kph | 4 mph

Friday: WSW @ 19 kph | 12 mph

Friday Night: WSW @ 19 kph | 12 mph

Saturday: W @ 25 kph | 16 mph

Saturday Night: W @ 25 kph | 16 mph

Sunday: NNE @ 12 kph | 8 mph

Sunday Night: NNE @ 12 kph | 8 mph

Monday: SSE @ 15 kph | 9 mph

Monday Night: SSE @ 15 kph | 9 mph

Tuesday: WSW @ 23 kph | 14 mph

Tuesday Night: WSW @ 23 kph | 14 mph

Wednesday: NNE @ 22 kph | 14 mph

Wednesday Night: NNE @ 22 kph | 14 mph

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

Tonight: 96 %

Friday: 96 %

Friday Night: 96 %

Saturday: 87 %

Saturday Night: 87 %

Sunday: 97 %

Sunday Night: 97 %

Monday: 90 %

Monday Night: 90 %

Tuesday: 93 %

Tuesday Night: 93 %

Wednesday: 91 %

Wednesday Night: 91 %

7 Day and Night - Snowfall Totals Forecast for Lancaster, 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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