Williamson, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 67°F 19°C	Observed at: Williamson, IL	Elevation: 608 ft | 185 m
	Last Updated: July 29, 5:30 AM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 67°F | 19°C
	Pressure: 29.28 in | 991.4 mb	Dewpoint: 59°F | 15°C
	Humidity: 76%	Wind: NE 6 mph | NE 10 kph
	Feels Like: 67°F | 19°C	Visibility: 40 mi | 64.3 km
	Lat/Long: 38.9856 | -89.7639	Sunrise: 5:57 AM   Sunset: 8:13 PM

7 Day Graphical Forecast

Valid: 5:32 AM 7/29/2026

Tonight Clear 66 °F 1% Chance Precipitation Thursday Overcast 87 |65 °F 0% Chance Precipitation Friday Light Showers 78 |65 °F 71% Chance Precipitation Saturday Light Showers 76 |66 °F 71% Chance Precipitation Sunday Light Drizzle 80 |60 °F 23% Chance Precipitation Monday Clear 81 |63 °F 21% Chance Precipitation Tuesday Clear 82 |60 °F 13% Chance Precipitation

7 Hour Graphical Forecast

Valid: 5:32 AM 7/29/2026

5 AM Clear 67 °F 0% Chance Precipitation

6 AM Clear 66 °F 1% Chance Precipitation

7 AM Clear 67 °F 1% Chance Precipitation

8 AM Clear 69 °F 1% Chance Precipitation

9 AM Clear 72 °F 0% Chance Precipitation

10 AM Clear 75 °F 0% Chance Precipitation

11 AM Clear 78 °F 0% Chance Precipitation

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

7 Day & Night Weather Forecast for Williamson, IL - (Fahrenheit & Celsius) Valid: 5:32 AM 7/29/2026 Tonight Clear with a low around 66°F [19°C]. NE wind to around 8 mph [13 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 87°F [31°C]. E wind to around 6 mph [9 kph], with gusts to near 15 mph [24 kph]. Dewpoint near 59°F [15°C] with humidity of 76%. Pressure around 29.28 in [991.4 mb]. UV Index: 7.3. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 65°F [18°C]. E wind to around 6 mph [9 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 78°F [26°C]. SSE wind to around 15 mph [24 kph], with gusts to near 31 mph [50 kph]. Dewpoint near 59°F [15°C] with humidity of 94%. Pressure around 29.28 in [991.4 mb]. UV Index: 6. Chance of precipitation 71% with QPF of 0.29 in [7.4 mm]. Friday Night Light Showers with a low around 65°F [18°C]. SSE wind to around 15 mph [24 kph], with gusts to near 31 mph [50 kph]. Chance of precipitation 71% with QPF of 0.29 in [7.4 mm]. Saturday Light Showers with a high near 76°F [24°C]. NE wind to around 17 mph [28 kph], with gusts to near 28 mph [46 kph]. Dewpoint near 59°F [15°C] with humidity of 98%. Pressure around 29.28 in [991.4 mb]. UV Index: 5.5. Chance of precipitation 71% with QPF of 0.27 in [6.9 mm]. Saturday Night Light Showers with a low around 66°F [19°C]. NE wind to around 17 mph [28 kph], with gusts to near 28 mph [46 kph]. Chance of precipitation 71% with QPF of 0.27 in [6.9 mm]. Sunday Light Drizzle with a high near 80°F [27°C]. NNE wind to around 13 mph [20 kph], with gusts to near 26 mph [41 kph]. Dewpoint near 59°F [15°C] with humidity of 97%. Pressure around 29.28 in [991.4 mb]. UV Index: 7.4. Chance of precipitation 23% with QPF of 0.01 in [0.2 mm]. Sunday Night Light Drizzle with a low around 60°F [16°C]. NNE wind to around 13 mph [20 kph], with gusts to near 26 mph [41 kph]. Chance of precipitation 23% with QPF of 0.01 in [0.2 mm]. Monday Clear with a high near 81°F [27°C]. ENE wind to around 7 mph [11 kph], with gusts to near 11 mph [17 kph]. Dewpoint near 59°F [15°C] with humidity of 94%. Pressure around 29.28 in [991.4 mb]. UV Index: 7.45. Chance of precipitation 21% with QPF of 0.00 in [0.0 mm]. Monday Night Clear with a low around 63°F [17°C]. ENE wind to around 7 mph [11 kph], with gusts to near 11 mph [17 kph]. Chance of precipitation 21% with QPF of 0.00 in [0.0 mm]. Tuesday Clear with a high near 82°F [28°C]. ESE wind to around 8 mph [12 kph], with gusts to near 14 mph [23 kph]. Dewpoint near 59°F [15°C] with humidity of 88%. Pressure around 29.28 in [991.4 mb]. UV Index: 7.45. Chance of precipitation 13% with QPF of 0.00 in [0.0 mm]. Tuesday Night Clear with a low around 60°F [16°C]. ESE wind to around 8 mph [12 kph], with gusts to near 14 mph [23 kph]. Chance of precipitation 13% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Williamson, IL

Tonight: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 7.4 mm | 0.29 in

Friday Night: 7.4 mm | 0.29 in

Saturday: 6.9 mm | 0.27 in

Saturday Night: 6.9 mm | 0.27 in

Sunday: 0.2 mm | 0.01 in

Sunday Night: 0.2 mm | 0.01 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 Williamson, IL

Tonight: NE @ 13 kph | 8 mph

Thursday: E @ 9 kph | 6 mph

Thursday Night: E @ 9 kph | 6 mph

Friday: SSE @ 24 kph | 15 mph

Friday Night: SSE @ 24 kph | 15 mph

Saturday: NE @ 28 kph | 17 mph

Saturday Night: NE @ 28 kph | 17 mph

Sunday: NNE @ 20 kph | 13 mph

Sunday Night: NNE @ 20 kph | 13 mph

Monday: ENE @ 11 kph | 7 mph

Monday Night: ENE @ 11 kph | 7 mph

Tuesday: ESE @ 12 kph | 8 mph

Tuesday Night: ESE @ 12 kph | 8 mph

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

Tonight: 92 %

Thursday: 76 %

Thursday Night: 76 %

Friday: 94 %

Friday Night: 94 %

Saturday: 98 %

Saturday Night: 98 %

Sunday: 97 %

Sunday Night: 97 %

Monday: 94 %

Monday Night: 94 %

Tuesday: 88 %

Tuesday Night: 88 %

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

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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