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Merrimac, Illinois Weather Forecast
Merrimac, Illinois Weather
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Weather Forecast for Merrimac, Illinois : Monroe County
Issued: 3:16 am CST Dec 21, 2025 Latitude: 38.3708872 Longitude: -90.3334511 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Monday Tuesday Wednesday Christmas Day Friday Saturday
Partly Sunny on Today Cloudy on Tonight Increasing Clouds on Monday Sunny on Tuesday Mostly Cloudy on Wednesday Mostly Sunny on Christmas Day Mostly Sunny on Friday Mostly Cloudy on Saturday
High: 45°F Low: 30°F High: 55°F High: 65°F High: 71°F High: 75°F High: 64°F High: 60°F
Low: 45°F Low: 46°F Low: 58°F Low: 51°F Low: 41°F  
Partly Sunny Cloudy Increasing Clouds Sunny Mostly Cloudy Mostly Sunny Mostly Sunny Mostly Cloudy
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Current Conditions at
EAST ST LOUIS - (KCPS)
25°
Clear
as of 4:53 AM CST
Rel. Humidity: 85%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.36 in.
Flight Rule: VFR
Wind Data
3 MPH
040° Northeast
Cloud Level(s): Clear
Current Conditions at
SPIRIT OF ST LOUIS - (KSUS)
21°
Clear
as of 4:54 AM CST
Rel. Humidity: 92%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.36 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
27°
Clear
as of 4:51 AM CST
Rel. Humidity: 68%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.36 in.
Flight Rule: VFR
Wind Data
3 MPH
030° Northeast
Cloud Level(s): Clear
Current Conditions at
SCOTT AFB - (KBLV)
32°
Mostly Clear
as of 4:55 AM CST
Rel. Humidity: 59%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.35 in.
Flight Rule: VFR
Wind Data
5 MPH
030° Northeast
Cloud Level(s): Few at 18000ft
Partly Sunny on Today Today... Partly sunny, then gradually becoming sunny, with a high near 45. Calm wind becoming east around 5 mph.
Cloudy on Tonight Tonight... Partly cloudy, with a low around 30. Calm wind becoming southeast around 5 mph after midnight.
Increasing Clouds on Monday Monday... Increasing clouds, with a high near 55. South wind 5 to 8 mph.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 45. South wind 3 to 6 mph.
Sunny on Tuesday Tuesday... Sunny, with a high near 65. West wind around 5 mph becoming calm in the afternoon.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 46.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 71.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 58.
Mostly Sunny on Christmas Day Christmas Day... Mostly sunny, with a high near 75.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 51.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 64.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 41.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 60.
Current Radar Image


Sun Almanac for Merrimac, Illinois
Sunrise: 07:15 AM
Sunset: 4:44 PM
Civil Sunrise:06:45 AM
Civil Sunset: 5:14 PM
Nautical Sunrise: 06:12 AM
Nautical Sunset: 5:47 PM
Astro Sunrise: 05:40 AM
Astro Sunset: 6:19 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.