Local weather forecast

Weather in Saint Peter, IL

Updated 2026-08-11 12:00 local time · ZIP codes 62880

Sunny
Now90°F

Sunny

High / Low96° / 76°
Rain chance5%
Wind14 mph
Weather alerts

Active alerts

3
Extreme Heat Warning issued August 11 at 2:17AM CDT until August 12 at 8:00PM CDT by NWS St Louis MO

* WHAT...Dangerously hot conditions with heat index values up to 111. * WHERE...Portions of south central and southwest Illinois and central and east central Missouri. * WHEN...Until 8 PM CDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Safety instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668.

Heat Advisory issued August 11 at 12:53AM CDT until August 13 at 8:00PM CDT by NWS Paducah KY

* WHAT...Maximum daily heat index values up to near 110 degrees. * WHERE...Portions of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...Until 8 PM CDT /9 PM EDT/ Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Daily heat index values will remain elevated near or above 100 degrees through next weekend.

Safety instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Heat Advisory issued August 11 at 10:47AM CDT until August 13 at 8:00PM CDT by NWS Paducah KY

* WHAT...Very hot with peak heat index values up to near 110 degrees. * WHERE...All of southwest Indiana, western Kentucky, southeast Missouri, and southern Illinois excepting Perry County IL, where a Warning is in effect. * WHEN...Until 8 PM CDT /9 PM EDT/ Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Daily heat index values will remain elevated in the triple digits into and through the weekend.

Safety instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Hourly

Next hours

NowSunny90°3% rain
1 PMSunny95°2% rain
2 PMSunny96°2% rain
3 PMSunny96°2% rain
4 PMSunny95°2% rain
5 PMSunny94°2% rain
6 PMSunny91°2% rain
7 PMSunny88°3% rain
8 PMClear84°4% rain
9 PMClear82°4% rain
10 PMClear81°6% rain
11 PMClear80°6% rain
Forecast

3-day weather forecast

Today2026-08-11
Sunny
96° 76°Sunny
Rain 5%Gust 15 mph
Tomorrow2026-08-12
Sunny
92° 76°Sunny
Rain 36%Gust 11 mph
Thursday2026-08-13
Sunny
91° 69°Sunny
Rain 60%Gust 13 mph
Conditions

Weather details

Feels like98°F
Humidity67%
Pressure29.99 inHg
Visibility10 mi
Wind14 mph SW
Wind gusts18 mph
Precipitation0.00 in
UV index7
Daylight

Sunrise, sunset and moon

Sunrise06:05 AM
Sunset07:55 PM
Moonrise04:08 AM
Moon phaseNew Moon
Practical guide

Weather insights for today

Umbrella not essential

Rain chance stays relatively low over the next 12 hours (up to 6%).

Choose light, breathable clothing

It feels like 98°F with winds near 14 mph.

Best window: 8 PM

84°F, 4% rain chance and 9 mph wind.

Allow a little extra driving time

Visibility is around 10 mi; gusts may reach 27 mph.

Running conditions are less comfortable

Current temperature is 90°F, wind 14 mph, rain chance up to 6%.

High UV protection needed

UV index is 7. Sunscreen, shade and protective clothing are recommended.

Saint Peter weather today

Sunny and 90°F in Saint Peter, IL. Today's high is 96°F with a 5% rain chance. Winds are around 14 mph with gusts near 18 mph. Relative humidity is 67%, pressure is 29.99 inHg, and visibility is about 10 miles.

Tonight and tomorrow in Saint Peter

Sunrise is at 06:05 AM and sunset is at 07:55 PM. Tomorrow's forecast calls for Sunny with a high near 92°F and a low near 76°F. The maximum rain chance is 36%.

Nearby

Weather near Saint Peter

Illinois

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