What is today's weather forecast for Lake Petersburg, IL?

Today's forecast for Lake Petersburg shows a low of 3 degrees Fahrenheit. Mostly cloudy, with a low around 3.

What is the 7-day weather forecast for Lake Petersburg, IL?

The 7-day forecast for Lake Petersburg shows highs from 16 to 40 degrees and lows from 1 to 28 degrees Fahrenheit. Expect precipitation on 1 day with chances of 20% or higher.

Will it rain in Lake Petersburg, IL this week?

Yes, rain is possible in Lake Petersburg this week. Precipitation chances: Wednesday (50% chance).

How accurate is the Lake Petersburg weather forecast?

WeatherForYou provides highly accurate Lake Petersburg forecasts using National Weather Service data and current conditions from the nearest available weather stations, often miles closer than regional airports, for the most precise local forecasts.

Lake Petersburg, IL Weather Forecast and Current Conditions

Current Conditions From Nearby Local Station

Switch to Metric Units

16°F
Feels Like 11°F

Humidity 84% Dew Point 13°F Wind ENE 3 MPH Gusts 4 Barometer 29.78 in.

Report from a personal weather station 2.1 mi. NNE of central Lake Petersburg
at 2:14 AM Thu, Dec 4, 2025

Point Forecast at a Glance

WedDec 3

ThuDec 4

FriDec 5

SatDec 6

SunDec 7

MonDec 8

TueDec 9

7-Day Temperature Trend

Week Ahead Summary

High temperatures climb from 16°F to a high of 37°F by week's end. Dry weather expected throughout the week.

Climate Context

This week's forecast shows temperatures running 10°F below the historical average for December. Normal highs for this period are around 40°F with lows around 23°F.

This Date in Weather History

1982 - The temperature in New York City's Central Park reached 72 degrees to establish a record high for December. The month as a whole was also the warmest of record.

Lake Petersburg, IL 7 Day Weather Forecast Details

Wednesday Dec 3

Night: Mostly cloudy, with a low around 3. North wind 7 to 11 mph, with gusts as high as 20 mph.

Thursday Dec 4

Day: Mostly cloudy, then gradually becoming sunny, with a high near 16. Wind chill values between -8 and 2. North wind 5 to 7 mph becoming calm in the afternoon.

Night: Mostly clear, with a low around 1. Wind chill values between -2 and -7. Calm wind becoming south around 6 mph after midnight.

Friday Dec 5

Day: Mostly sunny, with a high near 31. Wind chill values between -2 and 8. South southwest wind around 7 mph.

Night: Mostly cloudy, with a low around 19. Southwest wind 3 to 6 mph.

Saturday Dec 6

Day: Mostly cloudy, with a high near 31. Light and variable wind becoming north northwest around 5 mph.

Night: Cloudy, with a low around 18. Northeast wind 3 to 6 mph.

Sunday Dec 7

Day: Mostly cloudy, with a high near 27.

Night: Mostly cloudy, with a low around 6.

Monday Dec 8

Day: Partly sunny, with a high near 27.

Night: Mostly cloudy, with a low around 18.

Tuesday Dec 9

Day: Partly sunny, with a high near 37.

Night: Mostly cloudy, with a low around 28.

Wednesday Dec 10

Day: A chance of rain. Mostly cloudy, with a high near 40.

About Lake Petersburg, IL

Lake Petersburg is a census-designated place in Menard County, Illinois, United States. Its population was 740 as of the 2020 census. The unincorporated community centers on a small reservoir, which is used extensively by residents for recreation.

Content from Wikipedia, licensed under CC BY-SA 3.0.

How We Provide Better Local Weather

Current conditions: We use the nearest available station to your location - including professional MESONET/MADIS and local weather stations - often miles closer than regional airports.

Forecasts: National Weather Service point forecasts predict for your specific area, not broad regional zones, making them far more relevant to your location.

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