U.S. Alerts
El Dorado Weather Logo
U.S. Radar Loop Conditions Map

U.S. Color Satellite North America Color Infrared Animated Satellite Loop

Interactive Wx Map Live U.S. Google Map Radar Thumbnail Image

US Precipitation 1 day, 24 hour precipitation map

US Temperatures US Conditions Map

US Climate Data US Conditions Map

Decatur, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Decatur IL
National Weather Service Forecast for: Decatur IL
Issued by: National Weather Service Lincoln, IL
Updated: 9:36 pm CST Dec 20, 2025
 
Tonight

Tonight: Mostly clear, with a low around 23. Northwest wind 6 to 8 mph, with gusts as high as 17 mph.
Mostly Clear
Sunday

Sunday: Sunny, with a high near 38. North northwest wind around 6 mph becoming light and variable  in the morning.
Sunny
Sunday
Night
Sunday Night: Increasing clouds, with a low around 26. Light east southeast wind becoming south southeast 5 to 10 mph in the evening. Winds could gust as high as 16 mph.
Increasing
Clouds
Monday

Monday: Partly sunny, with a high near 46. South wind 10 to 13 mph, with gusts as high as 21 mph.
Partly Sunny
Monday
Night
Monday Night: Mostly cloudy, with a low around 41. South southwest wind 8 to 10 mph, with gusts as high as 17 mph.
Mostly Cloudy
Tuesday

Tuesday: Mostly sunny, with a high near 55. Southwest wind 5 to 7 mph becoming north in the afternoon.
Mostly Sunny
Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 35. North wind 5 to 8 mph becoming east southeast after midnight.
Partly Cloudy
Wednesday

Wednesday: Cloudy, with a high near 60.
Cloudy
Wednesday
Night
Wednesday Night: Mostly cloudy, with a low around 52.
Mostly Cloudy
Lo 23 °F Hi 38 °F Lo 26 °F Hi 46 °F Lo 41 °F Hi 55 °F Lo 35 °F Hi 60 °F Lo 52 °F

 

Tonight
 
Mostly clear, with a low around 23. Northwest wind 6 to 8 mph, with gusts as high as 17 mph.
Sunday
 
Sunny, with a high near 38. North northwest wind around 6 mph becoming light and variable in the morning.
Sunday Night
 
Increasing clouds, with a low around 26. Light east southeast wind becoming south southeast 5 to 10 mph in the evening. Winds could gust as high as 16 mph.
Monday
 
Partly sunny, with a high near 46. South wind 10 to 13 mph, with gusts as high as 21 mph.
Monday Night
 
Mostly cloudy, with a low around 41. South southwest wind 8 to 10 mph, with gusts as high as 17 mph.
Tuesday
 
Mostly sunny, with a high near 55. Southwest wind 5 to 7 mph becoming north in the afternoon.
Tuesday Night
 
Partly cloudy, with a low around 35. North wind 5 to 8 mph becoming east southeast after midnight.
Wednesday
 
Cloudy, with a high near 60.
Wednesday Night
 
Mostly cloudy, with a low around 52.
Christmas Day
 
Mostly sunny, with a high near 66.
Thursday Night
 
Mostly cloudy, with a low around 47.
Friday
 
Mostly cloudy, with a high near 60.
Friday Night
 
Mostly cloudy, with a low around 38.
Saturday
 
Partly sunny, with a high near 50.

 

Forecast from NOAA-NWS for Decatur IL.

Weather Forecast Discussion
308
FXUS63 KILX 202259
AFDILX

Area Forecast Discussion...Updated Aviation
National Weather Service Lincoln IL
459 PM CST Sat Dec 20 2025

.KEY MESSAGES...

- Temperatures fluctuate through the weekend. Well above normal
  temperatures are forecast from Tuesday through at least Friday.
  There is a 50-80% chance of temperatures exceeding 65 degrees on
  Christmas Day along and southwest of a Macomb to Casey line.

- Mainly a dry forecast through the week over most of central and
  southeast IL. There`s a 20-40% chance of light showers in
  southeast IL Monday night.


&&

.DISCUSSION...
Issued at 14 PM CST Sat Dec 20 2025

Winds will shift out of the southwest are aiding in the warming
daytime temperatures of highs in the upper 40s to low 50s today. A
dry cold front is expected to pass through this afternoon/evening,
which will swing our winds to a more northerly direction,
introducing some CAA. Tomorrow`s high will be in the mid 30s to low
40s. Tomorrow night, a high pressure system will develop off to our
east, shifting the winds out of the southeast. This will begin our
great warm up for the Christmas holiday. By mid week, temperatures
during the day will be in the mid 50s to mid 60s. Lows tonight and
tomorrow night will be in the 20s, but will also warm to well above
normal for the week.

We will be pushing records on Christmas day. Most of the records are
in the low 60s (61-64 degrees) for our climate sites. There is a 50-
80% chance of temperatures exceeding 65 degrees on Christmas Day,
from the LREF, southwest of a Macomb to Casey line. The NBM shows
the 50-70% chances mainly in our southeastern 6 counties for that
same time.

The forecast is primarily dry, but there are a few weak disturbances
that look to move through that could produce a few sprinkles or
flakes occasionally through the next week. A cold front appears to
move late this week, but should be dry as according to the current
models. We are still several days out from Christmas, so some
forecast elements could still change. We (forecasters) tend to get a
bit skeptical of dry weather when temperatures get into the mid to
upper 60s with dewpoints nearing 60 degrees in December. We will
continue to monitor trends the next week. As of this moment, we
remain positive that Christmas should be a lovely, dry, warm day.

Copple

&&

.AVIATION...  (For the 00z TAFs through 00z Sunday Evening)
Issued at 458 PM CST Sat Dec 20 2025

High pressure currently centered over the Upper Midwest will shift
to central Illinois Sunday morning then to the Upper Ohio Valley
Sunday evening. NW winds will become light and variable as the
ridge moves overhead, then set up out of the SE behind the ridge
axis. VFR conditions are expected through the period.

Deubelbeiss

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$
View a Different U.S. Forecast Discussion Location
(In alphabetical order by state)



Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






Contact Us Contact Us Thumbnail | Mobile Mobile Phone Thumbnail
Private Policy | Terms & Conds | Consent Preferences | Cookie Policy
Never base any life decisions on weather information from this site or anywhere over the Internet.
Site is dedicated to our Lord & Savior Jesus Christ | Random Quotes of Jesus

Copyright © 2025 El Dorado Weather, Inc. | Site Designed By:  Webmaster Danny