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Sullivan, IL Weather
Current conditions
Observed at Mattoon / Charleston, Coles County Memorial Airport · 23 min ago
Forecast
10-day-
This Afternoon
Sunny, with a high near 75. West northwest wind around 2 mph.
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Tonight
Clear, with a low around 44. North northwest wind around 1 mph.
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Thursday
Sunny, with a high near 75. North northeast wind 0 to 3 mph.
National Weather Service forecast updated 32 min ago.
Hourly
Hourly forecast- Now73°
- 2 PM74°
- 3 PM74°
- 4 PM75°
- 5 PM74°
- 6 PM71°
- 7 PM66°
- 8 PM60°
- 9 PM55°
- 10 PM54°
- 11 PM52°
- Thu12 AM51°
- 1 AM49°
- 2 AM48°
- 3 AM47°
- 4 AM46°
- 5 AM45°
- 6 AM45°
- 7 AM44°
- 8 AM47°
- 9 AM54°
- 10 AM63°
- 11 AM67°
- 12 PM71°
10-day forecast
Details- TodayOct 21Sunny44°75°
- ThuOct 22Sunny45°75°
- FriOct 23Sunny44°74°
- SatOct 24Mostly Sunny45°74°
- SunOct 25Mostly Sunny47°77°
- MonOct 26Partly Sunny47°76°
- TueOct 27Partly Sunny44°69°
- WedOct 28Cloudy51°72°
- ThuOct 29Rain0.10 in45°68°
- FriOct 30Sunny37°60°
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 Sullivan
More weather news-
Update: The severe thunderstorm warning for Sullivan County is predicted to expire at 5:30 p.m.Syracuse.com Update: The severe thunderstorm warning for Sullivan County is predicted to expire at 5:30 p.m. The warning had been issued for Sullivan County. "The storms which prompted the warning have moved out of the…
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Be prepared for gusty showers in Finger Lakes, Southern Tier Friday midday — gusts could peak at 40 mphA report from the National Weather Service was issued on Friday at 10:10 a.m. for gusty showers until 11:15 a.m. for Yates, Seneca, Cayuga, Steuben and Schuyler counties. Residents can expect wind gusts of up to 40 mph…
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First Alert: Heavy rain and gusty winds brings landslide risk to SoutheastAlaska's News Source First Alert: Heavy rain and gusty winds brings landslide risk to Southeast 22 veterans travel to Washington, D.C., for Last Frontier Honor Flight GVEA asks members to conserve energy amid generator…
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Provincetown and Wellfleet HarborsKnow when to hit the flats. Tagged With: tide charts Filed Under: Provincetown, Tide Charts, Wellfleet The remnants of Hurricane Isaias moved … ▶ By Abraham Storer Oct 7, 2026 By Dorothea Samaha Oct 7, 2026 By Lauren…
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Severe Thunderstorms forecast for listening area - Central Mo InfoSevere Thunderstorms forecast for listening area Central Mo Info MISSOURI — As cooler weather moves into the listening area, so are severe thunderstorms. The National Weather Service has predicted damaging wind gusts…
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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…
- Central Illinois Winter Weather Outlook
The winter weather outlook for central and southeast Illinois has been released, and a detailed summary is available at this link. Some of the highlights: Current Conditions Latest Observations Daily Climate Maps…
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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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Sunshine, chilly mornings and a big warm-up ahead for central IllinoisCENTRAL ILLINOIS (25News Now) - Fall is making an appearance across central Illinois this weekend, but don’t get too comfortable with the chilly temperatures. After a cold start on Sunday morning, sunshine will help…
Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- WedModerate
- ThuModerate
- FriModerate
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
MonthlyTuscola, records since 1893. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Decatur 40 km
- Charleston 39 km
- Mattoon 24 km
- Effingham 54 km
- Taylorville 59 km
- Savoy 59 km
- Mount Zion 30 km
- Pana 47 km
- Monticello 48 km
- Shelbyville 27 km
- Tuscola 36 km
- Forsyth 47 km
Forecasters' discussion
From the National Weather Service office in ILX, issued 1 hr ago
Key Messages
- Sunny mild days and cool nights persist across central and southeast Illinois through Sunday, with highs in the mid- upper 70s and lows in the 40s.
- A cold front moves across the region early next week, bringing prospects for light rain, followed by cooler temperatures.
Discussion
Issued at 1211 PM CDT Wed Oct 21 2026
Surface ridge axis centered across the area provides quiet, clear conditions across central and southeast Illinois. Dry air and subsidence will continue to produce mainly clear skies and large diurnal temperature swings over the next several days.
Mid-level heights build across the Mississippi Valley Friday and this weekend as the surface high slips farther east. Models show strong consensus on establishing persistent southerly return flow. 850-hPa temperatures in the lower teens C, along with deeper mixing support afternoon highs around 80F on Sunday, around 15 degrees above climatological averages.
Medium-range deterministic solutions (ECMWF, ECMWF-AI, and GFS) and the ensemble suite diverge early next week regarding the progression of an upstream longwave trough and associated surface cold front. The deterministic GFS exhibits a faster frontal transit across central Illinois Monday evening with stronger pre-frontal 850-hPa flow (4050 kt). Conversely, the ECMWF and ECMWF-AI are roughly 6 to 12 hours slower, maintaining a broader frontal structure and tracking the primary boundary through the forecast area Tuesday. GEFS and ECMWF ensemble members favor this slower progression. Latest NBM run has lowered PoPs below mentionable levels, but this will likely change as the system develops. Behind the front, a shot of cooler air will move in, returning temperatures to more seasonable levels Tue-Wed.
Aviation
Issued at 1211 PM CDT Wed Oct 21 2026
Another cycle of VFR conditions and light/variable winds with high pressure in control.
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.