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Decatur, IL 62524 Weather
Current conditions
Observed at Decatur Airport · 30 min ago
Forecast
10-day-
Tonight
Clear, with a low around 43. East southeast wind around 2 mph.
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Wednesday
Sunny, with a high near 73. South southwest wind around 2 mph.
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Wednesday Night
Mostly clear, with a low around 46. North wind around 2 mph.
National Weather Service forecast updated 1 hr ago.
Hourly
Hourly forecast- Now54°
- 11 PM52°
- Wed12 AM48°
- 1 AM47°
- 2 AM47°
- 3 AM46°
- 4 AM45°
- 5 AM45°
- 6 AM44°
- 7 AM43°
- 8 AM45°
- 9 AM52°
- 10 AM60°
- 11 AM64°
- 12 PM68°
- 1 PM71°
- 2 PM72°
- 3 PM73°
- 4 PM73°
- 5 PM72°
- 6 PM69°
- 7 PM64°
- 8 PM59°
- 9 PM57°
10-day forecast
Details- TonightOct 20Clear43°
- WedOct 21Sunny46°73°
- ThuOct 22Sunny47°75°
- FriOct 23Sunny47°74°
- SatOct 24Mostly Sunny50°75°
- SunOct 25Mostly Sunny51°78°
- MonOct 26Partly Sunny47°73°
- TueOct 27Mostly Sunny65°
- WedOct 28Partly cloudy39°55°
- ThuOct 29Sunny34°55°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Decatur
More weather news- Days shorter
WAND DECATUR, Ill. (WAND) – It doesn’t matter that we lose well over 2 minutes of daylight every day this time of year. What matters is the origin of the air mass. A northern shift in the storm track will result in…
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Sunshine and a warming trend through the weekBeautiful weather is here to stay. DECATUR, Ill. (WAND) – High pressure is in control today, bringing plenty of sunshine and mild temperatures in the upper 60s to low 70s thanks to southerly flow. Tonight will be mostly…
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One of the year’s most pleasant weather stretches arrives in Central IllinoisDECATUR, Ill. (WAND) – A beautiful stretch of sunshine and mild temperatures is settling into the region, and it’s the perfect time to get outside and enjoy it. High pressure is taking control of the Midwest, locking in…
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A great week ahead for Central IllinoisWAND DECATUR, Ill. (WAND) – A wonderful weekend across Central Illinois carries into the start of the workweek. Overnight lows dip back into the upper 30s tonight with a small risk for patchy frost, though coverage will…
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Frost this morning, then a warming trend takes overWAND DECATUR, Ill. (WAND) – Patchy frost is expected this morning with a near area-wide Frost Advisory in effect through 9 a.m., except for Illinois River counties. High pressure is in control today, bringing plenty of…
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Frost advisory back in effect for Central IllinoisWAND DECATUR, Ill. (WAND) – Another cool day starts the weekend across Central Illinois with highs Saturday only reaching the upper 50s under plenty of sunny skies. Strong high pressure remains in control keeping skies…
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Frost advisory in effect for West Central Illinois; cool to start the weekendWAND DECATUR, Ill. (WAND) – Significantly cooler weather wraps up the work week behind the latest cold front with temperatures nearly 20 degrees below Thursday’s highs. Cloud cover remains through the day before skies…
- What makes a storm severe?
DECATUR, Ill. (WAND) – When we call a storm “severe,” we’re not just talking about a loud, rainy thunderstorm. The National Weather Service has a very specific definition. A thunderstorm is severe if it produces: If it…
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Strong to severe storms on tap Thursday eveningWAND DECATUR, Ill. (WAND) – Thursday will be a wet day across Central Illinois. Showers will arrive by late morning before a second round of storms moves in during the evening. The main window for strong to severe…
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Strong storms are possible this afternoon and evening across Central IllinoisDECATUR, Ill. (WAND) – An active weather day is shaping up for Central Illinois, with strong to severe thunderstorms expected to develop this afternoon and evening as a cold front lifts back into the region. The Storm…
Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- TueModerate
- WedModerate
- ThuModerate
Decatur, IL reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Nearby
- Springfield 57 km
- Lincoln 46 km
- Taylorville 43 km
- Clinton 33 km
- Mount Zion 13 km
- Pana 52 km
- Monticello 40 km
- Sherman 53 km
- Shelbyville 52 km
- Sullivan 43 km
- Tuscola 60 km
- Rochester 48 km
Forecasters' discussion
From the National Weather Service office in ILX, issued 4 hrs ago
Key Messages
- Dry conditions and tranquil weather prevail across central and southeast Illinois through this weekend.
- Above normal temperatures will dominate the region, with afternoon highs climbing into the mid to upper 70s.
Discussion
Issued at 1233 PM CDT Tue Oct 20 2026
Expansive surface high pressure centered south of James Bay extends southwest into the mid and lower Mississippi Valley this afternoon. Broad subsidence and very dry air below 500 mb will lead to clear skies through tonight. High temperatures to peak in the lower 70s today, followed by overnight lows in the mid 40s.
A moderating trend begins Wednesday and continues through this weekend as upper level ridging amplifies overhead. Suite of model guidance indicates 850 hPa temperatures warming to +11C to +13C through this period. Afternoon mix-down of this air will lead to daily highs in the mid 70s through Friday, then upper 70s to around 80F this weekend when southwest low level flow becomes better established. Forecast soundings show daytime boundary layer mixing reducing afternoon dewpoints into the 40s, yielding minimum relative humidity values between 30 and 40 percent. Normally in late October this would result in an enhanced risk of fire spread, but a weak MSLP gradient will promote light winds under 10 mph through Friday.
A transition in the upper air pattern begins Monday into Tuesday as a potent upper-level trough traverses the northern Plains and lifts toward the Upper Midwest. The ECMWF-AI and operational ECMWF-Ens have remained consistent with a slightly slower frontal passage than the GEFS members, bringing the attendant cold front into western Illinois Monday evening and clearing southeast Illinois Tuesday afternoon. The NBM introduces slight chance PoPs (15 percent) west of the Illinois River Monday afternoon. With a lack of upper level support and projected dry airmass, models generally show a dry frontal passage for the remainder of the CWA.
Aviation
Issued at 602 PM CDT Tue Oct 20 2026
VFR conditions continue. High pressure will keep winds light and somewhat variable the next 24 hours.
Ilx Watches
None.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.