SEVERE THUNDERSTORM WATCH 563 REMAINS VALID UNTIL 2 PM CDT THIS AFTERNOON FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 11 COUNTIES IN NORTH CENTRAL ILLINOIS BUREAU PUTNAM IN NORTHWEST ILLINOIS CARROLL HENRY IL JO DAVIESS MERCER ROCK ISLAND STEPHENSON WHITESIDE IN WEST CENTRAL ILLINOIS HENDERSON WARREN IN IOWA THIS WATCH INCLUDES 6 COUNTIES IN EAST CENTRAL IOWA CLINTON JACKSON MUSCATINE SCOTT IN SOUTHEAST IOWA DES MOINES LOUISA THIS INCLUDES THE CITIES OF ALEDO, BETTENDORF, BURLINGTON, CLINTON, CREDIT ISLAND, DAVENPORT, FREEPORT, GALENA, GENESEO, HENNEPIN, MAQUOKETA, MOLINE, MONMOUTH, MOUNT CARROLL, MUSCATINE, OQUAWKA, PRINCETON, ROCK ISLAND, STERLING, AND WAPELLO.
Weather in Lyndon, IL
Updated 2026-08-11 13:15 local time · ZIP codes 61261
Sunny
Active alerts
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Boone County in north central Illinois... De Kalb County in north central Illinois... Northern La Salle County in north central Illinois... Lee County in north central Illinois... Ogle County in north central Illinois... Southern Winnebago County in north central Illinois... * WHEN...Until 130 PM CDT. * IMPACTS...Creeks and streams may rise out of their banks. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 931 AM CDT, Doppler radar and automated rain gauges indicated a line of intense thunderstorms with rainfall rates of 2 to 3 inches per hour moving through the area. Localized flooding of roadways and poor drainage areas will occur shortly after the onset of rainfall. - Some locations that will experience flooding include... Rockford, DeKalb, Belvidere, Loves Park, Machesney Park, Ottawa, Sycamore, Dixon, Rochelle, Sandwich, Mendota, Poplar Grove, Genoa, Byron, Oregon, Mount Morris, Amboy, Polo and Sheridan. - http://www.weather.gov/safety/flood
Safety instructions
A Flood Advisory means minor flooding along waterways and other poor drainage areas is imminent or may already be occurring. Persons in the advisory area should use caution and avoid flood waters.
Next hours
74°34% rain84°10% rain
85°40% rain87°9% rain87°17% rain86°8% rain83°10% rain80°12% rain
78°12% rain77°12% rain76°18% rain
72°43% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Weather insights for today
Rain chance reaches about 43% over the next 12 hours.
It feels like 77°F with winds near 9 mph.
80°F, 12% rain chance and 6 mph wind.
Visibility is around 10 mi; gusts may reach 16 mph.
Current temperature is 74°F, wind 9 mph, rain chance up to 43%.
UV index is 6. Sunscreen, shade and protective clothing are recommended.
Lyndon weather today
Sunny and 74°F in Lyndon, IL. Today's high is 87°F with a 80% rain chance. Winds are around 9 mph with gusts near 14 mph. Relative humidity is 94%, pressure is 29.91 inHg, and visibility is about 10 miles.
Tonight and tomorrow in Lyndon
Sunrise is at 06:04 AM and sunset is at 08:05 PM. Tomorrow's forecast calls for Sunny with a high near 83°F and a low near 70°F. The maximum rain chance is 81%.