Local weather forecast

Weather in Princeton, IL

Updated 2026-08-11 12:45 local time · ZIP codes 61356

Sunny
Now73°F

Sunny

High / Low92° / 75°
Rain chance36%
Wind6 mph
Weather alerts

Active alerts

1
Flood Advisory issued August 11 at 9:32AM CDT until August 11 at 1:30PM CDT by NWS Chicago IL

* 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.

Hourly

Next hours

NowSunny73°34% rain
2 PMPatchy rain nearby92°18% rain
3 PMPatchy rain nearby91°20% rain
4 PMSunny90°4% rain
5 PMPatchy rain nearby91°17% rain
6 PMSunny86°7% rain
7 PMSunny82°8% rain
8 PMPatchy rain nearby79°25% rain
9 PMClear77°10% rain
10 PMClear76°10% rain
11 PMClear76°17% rain
12 AMFog71°43% rain
Forecast

3-day weather forecast

Today2026-08-11
Sunny
92° 75°Sunny
Rain 36%Gust 13 mph
Tomorrow2026-08-12
Sunny
82° 70°Sunny
Rain 83%Gust 13 mph
Thursday2026-08-13
Mist
81° 67°Mist
Rain 84%Gust 7 mph
Conditions

Weather details

Feels like77°F
Humidity94%
Pressure29.93 inHg
Visibility10 mi
Wind6 mph S
Wind gusts12 mph
Precipitation0.01 in
UV index2
Daylight

Sunrise, sunset and moon

Sunrise06:03 AM
Sunset08:03 PM
Moonrise04:02 AM
Moon phaseNew Moon
Practical guide

Weather insights for today

Take an umbrella

Rain chance reaches about 43% over the next 12 hours.

Light layers should work

It feels like 77°F with winds near 6 mph.

Best window: 7 PM

82°F, 8% rain chance and 7 mph wind.

Use extra caution while driving

Visibility is around 10 mi; gusts may reach 17 mph.

Run with a few weather adjustments

Current temperature is 73°F, wind 6 mph, rain chance up to 43%.

Low UV protection needs

UV index is 2.

Princeton weather today

Sunny and 73°F in Princeton, IL. Today's high is 92°F with a 36% rain chance. Winds are around 6 mph with gusts near 12 mph. Relative humidity is 94%, pressure is 29.93 inHg, and visibility is about 10 miles.

Tonight and tomorrow in Princeton

Sunrise is at 06:03 AM and sunset is at 08:03 PM. Tomorrow's forecast calls for Sunny with a high near 82°F and a low near 70°F. The maximum rain chance is 83%.

Nearby

Weather near Princeton

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