Mendon, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Mostly Clear 78°F 26°C Heat Index: 78°F	Observed at: Mendon, IL	Elevation: 751 ft | 229 m
	Last Updated: July 16, 10:15 PM Timezone: GMT -5/-4
	Sky Conditions: Mostly Clear	Temperature: 78°F | 26°C
	Pressure: 29.19 in | 988.5 mb	Dewpoint: 71°F | 22°C
	Humidity: 78%	Wind: WSW 7 mph | WSW 11 kph
	Feels Like: 84°F | 29°C	Visibility: 38.1 mi | 61.4 km
	Lat/Long: 40.0883 | -91.2836	Sunrise: 5:49 AM   Sunset: 8:32 PM

7 Day Graphical Forecast

Valid: 10:16 PM 7/16/2026

Tonight Overcast 71 °F 5% Chance Precipitation Friday Overcast 90 |72 °F 15% Chance Precipitation Saturday Thunderstorm 94 |75 °F 40% Chance Precipitation Sunday Drizzle 86 |69 °F 21% Chance Precipitation Monday Drizzle 96 |71 °F 9% Chance Precipitation Tuesday Overcast 87 |65 °F 12% Chance Precipitation Wednesday Overcast 72 |53 °F 4% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:16 PM 7/16/2026

10 PM Mostly Clear 79 °F 3% Chance Precipitation

11 PM Partly Cloudy 77 °F 3% Chance Precipitation

12 AM Overcast 76 °F 4% Chance Precipitation

1 AM Mostly Clear 75 °F 5% Chance Precipitation

2 AM Clear 74 °F 7% Chance Precipitation

3 AM Mostly Clear 73 °F 7% Chance Precipitation

4 AM Partly Cloudy 73 °F 6% Chance Precipitation

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

7 Day & Night Weather Forecast for Mendon, IL - (Fahrenheit & Celsius) Valid: 10:16 PM 7/16/2026 Tonight Overcast with a low around 71°F [22°C]. SW wind to around 7 mph [11 kph], with gusts to near 14 mph [23 kph]. Chance of precipitation 5% with QPF of 0.00 in [0.0 mm]. Friday Overcast with a high near 90°F [32°C]. WSW wind to around 11 mph [18 kph], with gusts to near 18 mph [28 kph]. Dewpoint near 71°F [22°C] with humidity of 93%. Pressure around 29.19 in [988.5 mb]. UV Index: 7.75. Chance of precipitation 15% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 72°F [22°C]. WSW wind to around 11 mph [18 kph], with gusts to near 18 mph [28 kph]. Chance of precipitation 15% with QPF of 0.00 in [0.0 mm]. Saturday Thunderstorm with a high near 94°F [35°C]. WSW wind to around 13 mph [21 kph], with gusts to near 28 mph [45 kph]. Dewpoint near 71°F [22°C] with humidity of 91%. Pressure around 29.19 in [988.5 mb]. UV Index: 7.8. Chance of precipitation 40% with QPF of 0.07 in [1.7 mm]. Saturday Night Thunderstorm with a low around 75°F [24°C]. WSW wind to around 13 mph [21 kph], with gusts to near 28 mph [45 kph]. Chance of precipitation 40% with QPF of 0.07 in [1.7 mm]. Sunday Drizzle with a high near 86°F [30°C]. E wind to around 11 mph [17 kph], with gusts to near 22 mph [35 kph]. Dewpoint near 71°F [22°C] with humidity of 96%. Pressure around 29.19 in [988.5 mb]. UV Index: 6.95. Chance of precipitation 21% with QPF of 0.19 in [4.9 mm]. Sunday Night Drizzle with a low around 69°F [21°C]. E wind to around 11 mph [17 kph], with gusts to near 22 mph [35 kph]. Chance of precipitation 21% with QPF of 0.19 in [4.9 mm]. Monday Drizzle with a high near 96°F [35°C]. S wind to around 12 mph [19 kph], with gusts to near 24 mph [38 kph]. Dewpoint near 71°F [22°C] with humidity of 97%. Pressure around 29.19 in [988.5 mb]. UV Index: 7.85. Chance of precipitation 9% with QPF of 0.02 in [0.6 mm]. Monday Night Drizzle with a low around 71°F [22°C]. S wind to around 12 mph [19 kph], with gusts to near 24 mph [38 kph]. Chance of precipitation 9% with QPF of 0.02 in [0.6 mm]. Tuesday Overcast with a high near 87°F [31°C]. NW wind to around 20 mph [33 kph], with gusts to near 34 mph [55 kph]. Dewpoint near 71°F [22°C] with humidity of 79%. Pressure around 29.19 in [988.5 mb]. UV Index: 7.1. Chance of precipitation 12% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 65°F [19°C]. NW wind to around 20 mph [33 kph], with gusts to near 34 mph [55 kph]. Chance of precipitation 12% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 72°F [22°C]. NNE wind to around 13 mph [21 kph], with gusts to near 27 mph [43 kph]. Dewpoint near 71°F [22°C] with humidity of 91%. Pressure around 29.19 in [988.5 mb]. UV Index: 7.55. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 53°F [12°C]. NNE wind to around 13 mph [21 kph], with gusts to near 27 mph [43 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 Mendon, IL

Tonight: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 1.7 mm | 0.07 in

Saturday Night: 1.7 mm | 0.07 in

Sunday: 4.9 mm | 0.19 in

Sunday Night: 4.9 mm | 0.19 in

Monday: 0.6 mm | 0.02 in

Monday Night: 0.6 mm | 0.02 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 Mendon, IL

Tonight: SW @ 11 kph | 7 mph

Friday: WSW @ 18 kph | 11 mph

Friday Night: WSW @ 18 kph | 11 mph

Saturday: WSW @ 21 kph | 13 mph

Saturday Night: WSW @ 21 kph | 13 mph

Sunday: E @ 17 kph | 11 mph

Sunday Night: E @ 17 kph | 11 mph

Monday: S @ 19 kph | 12 mph

Monday Night: S @ 19 kph | 12 mph

Tuesday: NW @ 33 kph | 20 mph

Tuesday Night: NW @ 33 kph | 20 mph

Wednesday: NNE @ 21 kph | 13 mph

Wednesday Night: NNE @ 21 kph | 13 mph

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

Tonight: 92 %

Friday: 93 %

Friday Night: 93 %

Saturday: 91 %

Saturday Night: 91 %

Sunday: 96 %

Sunday Night: 96 %

Monday: 97 %

Monday Night: 97 %

Tuesday: 79 %

Tuesday Night: 79 %

Wednesday: 91 %

Wednesday Night: 91 %

7 Day and Night - Snowfall Totals Forecast for Mendon, 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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