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Local weather forecast

Weather in Mendon, IL

Updated 2026-09-26 10:00 local time · ZIP codes 62351

Patchy rain nearby
Now60°F

Patchy rain nearby

High / Low69° / 59°
Rain chance36%
Wind8 mph
Weather alerts

Active alerts

2
Flood Warning issued September 25 at 12:14PM CDT until September 28 at 1:00AM CDT by NWS St Louis MO

...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Louisiana. Mississippi River at Hannibal. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Clarksville. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Saverton. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is forecast. * WHERE...Mississippi River at Hannibal. * WHEN...Until late Sunday night. * IMPACTS...At 17.0 feet, John Hay Recreation Area on east side (inside the Illinois Sny Levee) begins flooding. * ADDITIONAL DETAILS... - At 11:15 AM CDT Friday the stage was 17.0 feet. - Forecast...The river is expected to rise above flood stage this afternoon to a crest of 17.1 feet just after midnight tonight. It will then fall below flood stage tomorrow evening. - Flood stage is 17.0 feet.

Safety instructions

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx

Flood Warning issued September 25 at 8:50PM CDT until September 27 at 7:00PM CDT by NWS St Louis MO

...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Louisiana. Mississippi River at Hannibal. Mississippi River at Clarksville. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Hannibal. * WHEN...Until Sunday evening. * IMPACTS...At 17.0 feet, John Hay Recreation Area on east side (inside the Illinois Sny Levee) begins flooding. * ADDITIONAL DETAILS... - At 8:15 PM CDT Friday the stage was 17.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:15 PM CDT Friday was 17.0 feet. - Forecast...The river is expected to rise to a crest of 17.1 feet just after midnight tonight. It will then fall below flood stage early tomorrow afternoon. - Flood stage is 17.0 feet.

Safety instructions

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx

Hourly

Next hours

NowPatchy rain nearby60°17% rain
11 AMPatchy rain nearby60°19% rain
12 PMOvercast60°15% rain
1 PMPatchy rain nearby63°14% rain
2 PMOvercast68°11% rain
3 PMPatchy rain nearby69°17% rain
4 PMPatchy rain nearby69°11% rain
5 PMOvercast68°12% rain
6 PMOvercast66°14% rain
7 PMOvercast64°16% rain
8 PMCloudy62°13% rain
9 PMCloudy61°11% rain
Forecast

3-day weather forecast

Today2026-09-26
Overcast
69° 59°Overcast
Rain 36%Gust 10 mph
Tomorrow2026-09-27
Overcast
74° 59°Overcast
Rain 12%Gust 8 mph
Monday2026-09-28
Sunny
75° 58°Sunny
Rain 3%Gust 9 mph
Conditions

Weather details

Feels like55°F
Humidity61%
Pressure30.16 inHg
Visibility6 mi
Wind8 mph ESE
Wind gusts12 mph
Precipitation0.00 in
UV index1
Daylight

Sunrise, sunset and moon

Sunrise06:56 AM
Sunset06:56 PM
Moonrise06:46 PM
Moon phaseFull Moon
Next 24 hours

Key weather changes ahead

Warmest hour3 PM · 69°F
Coolest hour1 AM · 59°F
Highest rain chance11 AM · 19%
Strongest gusts8 PM · 17 mph
Practical guide

Weather insights for today

Umbrella not essential

Rain chance stays relatively low over the next 12 hours (up to 19%).

Light layers should work

It feels like 55°F with winds near 8 mph.

Best window: 4 PM

69°F, 11% rain chance and 10 mph wind.

Driving conditions look generally normal

Visibility is around 6 mi; gusts may reach 17 mph.

Good conditions for an easy run

Current temperature is 60°F, wind 8 mph, rain chance up to 19%.

Low UV protection needs

UV index is 1.

Local weather characteristics in Mendon

Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.

Mendon is part of the Midwest weather region. The forecast point is near 40.09°N latitude and 91.28°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.

Mendon weather today

Patchy rain nearby and 60°F in Mendon, IL. Today's high is 69°F with a 36% rain chance. Winds are around 8 mph with gusts near 12 mph. Relative humidity is 61%, pressure is 30.16 inHg, and visibility is about 6 miles.

Tonight and tomorrow in Mendon

Sunrise is at 06:56 AM and sunset is at 06:56 PM. Tomorrow's forecast calls for Overcast with a high near 74°F and a low near 59°F. The maximum rain chance is 12%.

Nearby

Weather near Mendon

Loraine, IL~5 mi awayPaloma, IL~7 mi awayCoatsburg, IL~7 mi awayLima, IL~7 mi awayUrsa, IL~8 mi awayFowler, IL~9 mi awayWest Point, IL~9 mi awaySutter, IL~10 mi away
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