Duncan, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 61°F 16°C	Observed at: Duncan, IL	Elevation: 868 ft | 265 m
	Last Updated: July 29, 6:15 AM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 61°F | 16°C
	Pressure: 29.25 in | 990.6 mb	Dewpoint: 53°F | 12°C
	Humidity: 75%	Wind: NNW 2 mph | NNW 3 kph
	Feels Like: 61°F | 16°C	Visibility: 40.4 mi | 65 km
	Lat/Long: 40.9836 | -89.7892	Sunrise: 5:52 AM   Sunset: 8:18 PM

7 Day Graphical Forecast

Valid: 6:18 AM 7/29/2026

Today Clear 88 |61 °F 31 |16 °C 0% Chance Precipitation Thursday Overcast 90 |62 °F 32 |17 °C 0% Chance Precipitation Friday Light Showers 71 |64 °F 21 |18 °C 82% Chance Precipitation Saturday Light Drizzle 76 |64 °F 24 |18 °C 79% Chance Precipitation Sunday Light Drizzle 79 |60 °F 26 |15 °C 15% Chance Precipitation Monday Clear 80 |60 °F 27 |15 °C 11% Chance Precipitation Tuesday Clear 82 |62 °F 28 |16 °C 14% Chance Precipitation

7 Hour Graphical Forecast

Valid: 6:18 AM 7/29/2026

6 AM Clear 61 °F 0% Chance Precipitation

7 AM Clear 62 °F 0% Chance Precipitation

8 AM Clear 66 °F 0% Chance Precipitation

9 AM Clear 72 °F 0% Chance Precipitation

10 AM Clear 76 °F 0% Chance Precipitation

11 AM Clear 79 °F 0% Chance Precipitation

12 PM Clear 82 °F 0% Chance Precipitation

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

7 Day & Night Weather Forecast for Duncan, IL - (Fahrenheit & Celsius) Valid: 6:18 AM 7/29/2026 Today Clear with a high near 88°F [31°C]. ENE wind to around 9 mph [14 kph], with gusts to near 13 mph [21 kph]. Dewpoint near 53°F [12°C] with humidity of 86%. Pressure around 29.25 in [990.6 mb]. UV Index: 7.45. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Tonight Clear with a low around 61°F [16°C]. ENE wind to around 9 mph [14 kph], with gusts to near 13 mph [21 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 90°F [32°C]. SE wind to around 7 mph [11 kph], with gusts to near 15 mph [24 kph]. Dewpoint near 53°F [12°C] with humidity of 74%. Pressure around 29.25 in [990.6 mb]. UV Index: 7.1. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 62°F [17°C]. SE wind to around 7 mph [11 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Friday Light Showers with a high near 71°F [21°C]. SE wind to around 13 mph [21 kph], with gusts to near 27 mph [43 kph]. Dewpoint near 53°F [12°C] with humidity of 98%. Pressure around 29.25 in [990.6 mb]. UV Index: 2.8. Chance of precipitation 82% with QPF of 0.55 in [14.0 mm]. Friday Night Light Showers with a low around 64°F [18°C]. SE wind to around 13 mph [21 kph], with gusts to near 27 mph [43 kph]. Chance of precipitation 82% with QPF of 0.55 in [14.0 mm]. Saturday Light Drizzle with a high near 76°F [24°C]. NE wind to around 14 mph [23 kph], with gusts to near 25 mph [40 kph]. Dewpoint near 53°F [12°C] with humidity of 98%. Pressure around 29.25 in [990.6 mb]. UV Index: 7. Chance of precipitation 79% with QPF of 0.06 in [1.5 mm]. Saturday Night Light Drizzle with a low around 64°F [18°C]. NE wind to around 14 mph [23 kph], with gusts to near 25 mph [40 kph]. Chance of precipitation 79% with QPF of 0.06 in [1.5 mm]. Sunday Light Drizzle with a high near 79°F [26°C]. NNE wind to around 8 mph [12 kph], with gusts to near 12 mph [19 kph]. Dewpoint near 53°F [12°C] with humidity of 95%. Pressure around 29.25 in [990.6 mb]. UV Index: 7.25. Chance of precipitation 15% with QPF of 0.00 in [0.1 mm]. Sunday Night Light Drizzle with a low around 60°F [15°C]. NNE wind to around 8 mph [12 kph], with gusts to near 12 mph [19 kph]. Chance of precipitation 15% with QPF of 0.00 in [0.1 mm]. Monday Clear with a high near 80°F [27°C]. ESE wind to around 6 mph [10 kph], with gusts to near 7 mph [12 kph]. Dewpoint near 53°F [12°C] with humidity of 95%. Pressure around 29.25 in [990.6 mb]. UV Index: 7.35. Chance of precipitation 11% with QPF of 0.00 in [0.0 mm]. Monday Night Clear with a low around 60°F [15°C]. ESE wind to around 6 mph [10 kph], with gusts to near 7 mph [12 kph]. Chance of precipitation 11% with QPF of 0.00 in [0.0 mm]. Tuesday Clear with a high near 82°F [28°C]. SSE wind to around 8 mph [13 kph], with gusts to near 15 mph [24 kph]. Dewpoint near 53°F [12°C] with humidity of 95%. Pressure around 29.25 in [990.6 mb]. UV Index: 7.3. Chance of precipitation 14% with QPF of 0.00 in [0.0 mm]. Tuesday Night Clear with a low around 62°F [16°C]. SSE wind to around 8 mph [13 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 14% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Duncan, IL

Today: 0.0 mm | 0.00 in

Tonight: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 14.0 mm | 0.55 in

Friday Night: 14.0 mm | 0.55 in

Saturday: 1.5 mm | 0.06 in

Saturday Night: 1.5 mm | 0.06 in

Sunday: 0.1 mm | 0.00 in

Sunday Night: 0.1 mm | 0.00 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

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

Today: ENE @ 14 kph | 9 mph

Tonight: ENE @ 14 kph | 9 mph

Thursday: SE @ 11 kph | 7 mph

Thursday Night: SE @ 11 kph | 7 mph

Friday: SE @ 21 kph | 13 mph

Friday Night: SE @ 21 kph | 13 mph

Saturday: NE @ 23 kph | 14 mph

Saturday Night: NE @ 23 kph | 14 mph

Sunday: NNE @ 12 kph | 8 mph

Sunday Night: NNE @ 12 kph | 8 mph

Monday: ESE @ 10 kph | 6 mph

Monday Night: ESE @ 10 kph | 6 mph

Tuesday: SSE @ 13 kph | 8 mph

Tuesday Night: SSE @ 13 kph | 8 mph

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

Today: 86 %

Tonight: 86 %

Thursday: 74 %

Thursday Night: 74 %

Friday: 98 %

Friday Night: 98 %

Saturday: 98 %

Saturday Night: 98 %

Sunday: 95 %

Sunday Night: 95 %

Monday: 95 %

Monday Night: 95 %

Tuesday: 95 %

Tuesday Night: 95 %

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

Today: 0.0 cm | 0.00 in

Tonight: 0.0 cm | 0.00 in

Thursday: 0.0 cm | 0.00 in

Thursday Night: 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

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