Local weather forecast

Weather in Port Byron, IL

Updated 2026-09-26 09:00 local time · ZIP codes 61275

Overcast
Now55°F

Overcast

High / Low66° / 53°
Rain chance37%
Wind9 mph
Weather alerts

Active alerts

1
Flood Warning issued September 25 at 8:42PM CDT until October 1 at 1:00PM CDT by NWS Quad Cities IA IL

...The Flood Warning is extended for the following rivers in Iowa... Wapsipinicon River near De Witt 4S affecting Scott and Clinton Counties. * WHAT...Major flooding is occurring and major flooding is forecast. * WHERE...Wapsipinicon River near De Witt 4S. * WHEN...Until Thursday afternoon. * IMPACTS...At 13.0 feet, Water affects many residences along the river. * ADDITIONAL DETAILS... - At 8:30 PM CDT Friday the stage was 12.9 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:30 PM CDT Friday was 13.1 feet. - Forecast...The river is expected to fall below flood stage early Thursday morning and continue falling to 9.2 feet Friday, October 02. - Flood stage is 11.0 feet.

Safety instructions

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov/quadcities. The next statement will be issued by Saturday evening.

Hourly

Next hours

NowOvercast55°20% rain
10 AMOvercast58°18% rain
11 AMOvercast60°16% rain
12 PMOvercast62°15% rain
1 PMOvercast65°13% rain
2 PMOvercast65°13% rain
3 PMOvercast65°13% rain
4 PMOvercast66°13% rain
5 PMOvercast65°14% rain
6 PMCloudy64°14% rain
7 PMPartly Cloudy62°10% rain
8 PMCloudy60°17% rain
Forecast

3-day weather forecast

Today2026-09-26
Overcast
66° 53°Overcast
Rain 37%Gust 9 mph
Tomorrow2026-09-27
Sunny
70° 55°Sunny
Rain 10%Gust 6 mph
Monday2026-09-28
Sunny
72° 54°Sunny
Rain 4%Gust 7 mph
Conditions

Weather details

Feels like50°F
Humidity74%
Pressure30.18 inHg
Visibility6 mi
Wind9 mph ESE
Wind gusts15 mph
Precipitation0.00 in
UV index1
Daylight

Sunrise, sunset and moon

Sunrise06:53 AM
Sunset06:52 PM
Moonrise06:41 PM
Moon phaseFull Moon
Next 24 hours

Key weather changes ahead

Warmest hour4 PM · 66°F
Coolest hour9 AM · 55°F
Highest rain chance10 PM · 37%
Strongest gusts9 AM · 15 mph
Practical guide

Weather insights for today

Umbrella not essential

Rain chance stays relatively low over the next 12 hours (up to 20%).

Light layers should work

It feels like 50°F with winds near 9 mph.

Best window: 4 PM

66°F, 13% rain chance and 7 mph wind.

Driving conditions look generally normal

Visibility is around 6 mi; gusts may reach 15 mph.

Good conditions for an easy run

Current temperature is 55°F, wind 9 mph, rain chance up to 20%.

Low UV protection needs

UV index is 1.

Local weather characteristics in Port Byron

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

Port Byron is part of the Midwest weather region. The forecast point is near 41.61°N latitude and 90.34°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.

Port Byron weather today

Overcast and 55°F in Port Byron, IL. Today's high is 66°F with a 37% rain chance. Winds are around 9 mph with gusts near 15 mph. Relative humidity is 74%, pressure is 30.18 inHg, and visibility is about 6 miles.

Tonight and tomorrow in Port Byron

Sunrise is at 06:53 AM and sunset is at 06:52 PM. Tomorrow's forecast calls for Sunny with a high near 70°F and a low near 55°F. The maximum rain chance is 10%.

Nearby

Weather near Port Byron

Illinois

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