Potomac, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Mostly Clear 81°F 27°C Heat Index: 87°F	Observed at: Potomac, IL	Elevation: 780 ft | 238 m
	Last Updated: July 16, 10:15 PM Timezone: GMT -5/-4
	Sky Conditions: Mostly Clear	Temperature: 81°F | 27°C
	Pressure: 29.31 in | 992.6 mb	Dewpoint: 75°F | 24°C
	Humidity: 82%	Wind: S 4 mph | S 6 kph
	Feels Like: 90°F | 32°C	Visibility: 34.7 mi | 55.8 km
	Lat/Long: 40.305 | -87.8006	Sunrise: 5:35 AM   Sunset: 8:19 PM

7 Day Graphical Forecast

Valid: 10:20 PM 7/16/2026

Tonight Foggy 70 °F 5% Chance Precipitation Friday Heavy Showers 87 |76 °F 30% Chance Precipitation Saturday Thunderstorm with Hail 92 |74 °F 73% Chance Precipitation Sunday Overcast 80 |64 °F 36% Chance Precipitation Monday Overcast 83 |64 °F 15% Chance Precipitation Tuesday Thunderstorm 86 |67 °F 21% Chance Precipitation Wednesday Overcast 70 |55 °F 4% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:20 PM 7/16/2026

10 PM Clear 82 °F 5% Chance Precipitation

11 PM Overcast 80 °F 5% Chance Precipitation

12 AM Overcast 79 °F 6% Chance Precipitation

1 AM Partly Cloudy 79 °F 5% Chance Precipitation

2 AM Overcast 78 °F 3% Chance Precipitation

3 AM Partly Cloudy 77 °F 5% Chance Precipitation

4 AM Overcast 77 °F 8% Chance Precipitation

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

7 Day & Night Weather Forecast for Potomac, IL - (Fahrenheit & Celsius) Valid: 10:20 PM 7/16/2026 Tonight Foggy with a low around 70°F [21°C]. SW wind to around 6 mph [9 kph], with gusts to near 11 mph [18 kph]. Chance of precipitation 5% with QPF of 0.00 in [0.0 mm]. Friday Heavy Showers with a high near 87°F [30°C]. SW wind to around 9 mph [15 kph], with gusts to near 15 mph [24 kph]. Dewpoint near 75°F [24°C] with humidity of 96%. Pressure around 29.31 in [992.6 mb]. UV Index: 7.6. Chance of precipitation 30% with QPF of 2.61 in [66.3 mm]. Friday Night Heavy Showers with a low around 76°F [24°C]. SW wind to around 9 mph [15 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 30% with QPF of 2.61 in [66.3 mm]. Saturday Thunderstorm with Hail with a high near 92°F [33°C]. W wind to around 21 mph [34 kph], with gusts to near 37 mph [59 kph]. Dewpoint near 75°F [24°C] with humidity of 96%. Pressure around 29.31 in [992.6 mb]. UV Index: 7.65. Chance of precipitation 73% with QPF of 0.18 in [4.7 mm]. Saturday Night Thunderstorm with Hail with a low around 74°F [23°C]. W wind to around 21 mph [34 kph], with gusts to near 37 mph [59 kph]. Chance of precipitation 73% with QPF of 0.18 in [4.7 mm]. Sunday Overcast with a high near 80°F [27°C]. NE wind to around 8 mph [13 kph], with gusts to near 17 mph [27 kph]. Dewpoint near 75°F [24°C] with humidity of 94%. Pressure around 29.31 in [992.6 mb]. UV Index: 7.6. Chance of precipitation 36% with QPF of 0.00 in [0.0 mm]. Sunday Night Overcast with a low around 64°F [18°C]. NE wind to around 8 mph [13 kph], with gusts to near 17 mph [27 kph]. Chance of precipitation 36% with QPF of 0.00 in [0.0 mm]. Monday Overcast with a high near 83°F [28°C]. S wind to around 10 mph [16 kph], with gusts to near 23 mph [37 kph]. Dewpoint near 75°F [24°C] with humidity of 96%. Pressure around 29.31 in [992.6 mb]. UV Index: 7.55. Chance of precipitation 15% with QPF of 0.00 in [0.0 mm]. Monday Night Overcast with a low around 64°F [18°C]. S wind to around 10 mph [16 kph], with gusts to near 23 mph [37 kph]. Chance of precipitation 15% with QPF of 0.00 in [0.0 mm]. Tuesday Thunderstorm with a high near 86°F [30°C]. W wind to around 17 mph [27 kph], with gusts to near 35 mph [56 kph]. Dewpoint near 75°F [24°C] with humidity of 97%. Pressure around 29.31 in [992.6 mb]. UV Index: 7.6. Chance of precipitation 21% with QPF of 0.01 in [0.3 mm]. Tuesday Night Thunderstorm with a low around 67°F [20°C]. W wind to around 17 mph [27 kph], with gusts to near 35 mph [56 kph]. Chance of precipitation 21% with QPF of 0.01 in [0.3 mm]. Wednesday Overcast with a high near 70°F [21°C]. N wind to around 15 mph [23 kph], with gusts to near 29 mph [47 kph]. Dewpoint near 75°F [24°C] with humidity of 87%. Pressure around 29.31 in [992.6 mb]. UV Index: 6. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 55°F [13°C]. N wind to around 15 mph [23 kph], with gusts to near 29 mph [47 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 Potomac, IL

Tonight: 0.0 mm | 0.00 in

Friday: 66.3 mm | 2.61 in

Friday Night: 66.3 mm | 2.61 in

Saturday: 4.7 mm | 0.18 in

Saturday Night: 4.7 mm | 0.18 in

Sunday: 0.0 mm | 0.00 in

Sunday Night: 0.0 mm | 0.00 in

Monday: 0.0 mm | 0.00 in

Monday Night: 0.0 mm | 0.00 in

Tuesday: 0.3 mm | 0.01 in

Tuesday Night: 0.3 mm | 0.01 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 Potomac, IL

Tonight: SW @ 9 kph | 6 mph

Friday: SW @ 15 kph | 9 mph

Friday Night: SW @ 15 kph | 9 mph

Saturday: W @ 34 kph | 21 mph

Saturday Night: W @ 34 kph | 21 mph

Sunday: NE @ 13 kph | 8 mph

Sunday Night: NE @ 13 kph | 8 mph

Monday: S @ 16 kph | 10 mph

Monday Night: S @ 16 kph | 10 mph

Tuesday: W @ 27 kph | 17 mph

Tuesday Night: W @ 27 kph | 17 mph

Wednesday: N @ 23 kph | 15 mph

Wednesday Night: N @ 23 kph | 15 mph

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

Tonight: 96 %

Friday: 96 %

Friday Night: 96 %

Saturday: 96 %

Saturday Night: 96 %

Sunday: 94 %

Sunday Night: 94 %

Monday: 96 %

Monday Night: 96 %

Tuesday: 97 %

Tuesday Night: 97 %

Wednesday: 87 %

Wednesday Night: 87 %

7 Day and Night - Snowfall Totals Forecast for Potomac, 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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