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Decatur, IL Weather
Current conditions
Forecast for this hour (no station report in the last two hours)
Forecast
10-day-
Friday
Sunny, with a high near 74. Southeast wind around 5 mph.
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Friday Night
Mostly clear, with a low around 47. East southeast wind around 6 mph.
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Saturday
Mostly sunny, with a high near 74. Southeast wind around 6 mph.
National Weather Service forecast updated 4 hrs ago.
Hourly
Hourly forecast- Now54°
- 10 AM61°
- 11 AM65°
- 12 PM69°
- 1 PM71°
- 2 PM72°
- 3 PM73°
- 4 PM74°
- 5 PM72°
- 6 PM69°
- 7 PM64°
- 8 PM59°
- 9 PM56°
- 10 PM54°
- 11 PM53°
- Sat12 AM53°
- 1 AM52°
- 2 AM51°
- 3 AM50°
- 4 AM48°
- 5 AM48°
- 6 AM48°
- 7 AM47°
- 8 AM49°
10-day forecast
Details- TonightOct 22Clear44°
- TodayOct 23Sunny47°74°
- SatOct 24Mostly Sunny48°74°
- SunOct 25Mostly Sunny48°76°
- MonOct 26Partly Sunny50°75°
- TueOct 27Partly Sunny49°73°
- WedOct 28Mostly Sunny50°74°
- ThuOct 29Mostly Sunny11%73°
- FriOct 30Partly cloudy42°56°
- SatOct 31Cloudy0.07 in41°62°
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- High pressure keeps the sunshine rolling
WAND DECATUR, Ill. (WAND) – Our midweek forecast is more of the same tonight, and more tomorrow too. High pressure continues to dominate, delivering another mostly clear night, with lows dropping to the mid-40s…
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Another beautiful day ahead for Central IllinoisDECATUR, Ill. (WAND) – If you’re looking for a reason to get outside, Tuesday is your day. A high-pressure system settling over the Midwest is bringing abundant sunshine and calm winds to Central Illinois, with…
- 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…
- Capitol Fax.com - Your Illinois News Radar » Good morning!
Thursday, Oct 22, 2026 - Posted by Isabel Miller DOMi & JD BECK, Herbie Hancock… - Barton - Thursday, Oct 22, 26 @ 8:53 am: Oh yeah, and you have to monitor comments between it all. Thank you for the lessons…
Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- FriModerate
- SatModerate
- SunModerate
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
Almanac
MonthlyDecatur Ap, records since 2000. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Springfield 59 km
- Lincoln 49 km
- Taylorville 44 km
- Clinton 35 km
- Mount Zion 10 km
- Pana 51 km
- Monticello 39 km
- Sherman 56 km
- Shelbyville 50 km
- Sullivan 40 km
- Tuscola 58 km
- Rochester 50 km
Forecasters' discussion
From the National Weather Service office in ILX, issued 7 hrs ago
Key Messages
- Sunny mild days and cool nights persist across central and southeast Illinois through Wednesday, with highs in the 70s and lows in the 40s.
- A cold front moves across the region mid to late next week, though rain chances look pretty slim (30% or less), with temperatures cooling a bit for the end of next week.
Discussion
Issued at 203 AM CDT Fri Oct 23 2026
The blocking pattern continues over the eastern half of the United States. With the ridging not going anywhere any time soon, clear skies, light winds, and dry weather will continue across the state into the next week. Overall, perfect weather for the latter half of harvest season. The main focus of this forecast continues to be the above normal temperatures and lack of rain.
Temperatures will continue to be above normal as we move into the next week. Highs will be in the mid to upper 70s. Normals for this time of year is around 62-66 degrees across central and southeastern IL. The CPC's 6-10 day, 8-14 day, and Week 3-4 outlooks all show above normal temperatures. Dry weather will last through much of the extended period as well.
Looks like a cold front will try to makes its way into IL early next week, but with how dry the airmass is, it will have a hard fight to squeeze out any impactful rainfall, if it can even make it to central IL. However, there are some <30% chances for rain for late in the week when a stronger shortwave pushes into the region, breaking down this ridging pattern we are stuck in.
Aviation
Issued at 1210 AM CDT Fri Oct 23 2026
VFR conditions continue through the TAF period. Light and variable winds overnight become southeasterly late Friday morning with speeds increasing to 5-8 kts.
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.