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Sumner, IL 62466 Weather
Current conditions
Observed at Mount Carmel, Mount Carmel Municipal Airport · 43 min ago
Forecast
10-day-
This Afternoon
Sunny, with a high near 74. North wind around 2 mph.
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Tonight
Clear, with a low around 45. North wind around 1 mph.
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Thursday
Sunny, with a high near 75. North northeast wind 1 to 5 mph.
National Weather Service forecast updated 2 hrs ago.
Hourly
Hourly forecast- Now74°
- 4 PM74°
- 5 PM73°
- 6 PM70°
- 7 PM65°
- 8 PM60°
- 9 PM56°
- 10 PM54°
- 11 PM52°
- Thu12 AM51°
- 1 AM50°
- 2 AM49°
- 3 AM48°
- 4 AM47°
- 5 AM47°
- 6 AM46°
- 7 AM45°
- 8 AM47°
- 9 AM54°
- 10 AM63°
- 11 AM68°
- 12 PM71°
- 1 PM73°
- 2 PM74°
10-day forecast
Details- TodayOct 21Sunny45°74°
- ThuOct 22Sunny46°75°
- FriOct 23Sunny45°74°
- SatOct 24Mostly Sunny46°74°
- SunOct 25Mostly Sunny47°77°
- MonOct 26Partly Sunny48°76°
- TueOct 27Partly Sunny47°72°
- WedOct 28Cloudy55°76°
- ThuOct 29Showers0.10 in53°76°
- FriOct 30Sunny42°61°
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 Sumner
More weather news-
10/18/26: Clear Skies Expected Today with a High of 68.7; Currently 41.7°F and Winds Up to 7.8 mph, No Precipitation.Weather Today in Sumner County: Clear sky, high 69°F, low 41°F. Winds 10 mph. 7-day outlook inside. Current conditions in Sumner County at 5:50 AM show a temperature of 41.7°F with a light wind coming from the southeast…
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10/17/26: Clear Skies and 56.3, With Highs of 62.8 and Lows of 48; Tonight’s Low at 49.3, Winds Calming, No Precipitati…10/17/26: Clear Skies and 56.3, With Highs of 62.8 and Lows of 48; Tonight's Low at 49.3, Winds Calming, No Precipitati… Sumner County Source At 7:00 PM in Sumner County, the current temperature is 56.3°F with a wind…
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10/17/26: Clear Skies and 61, High 61.7, Low 47.1, Wind 13.5 mph, Tonight Low 48.2, Clear, Wind 8.6 mph, 7% Precip Chan…Weather Today in Sumner County: Overcast, high 62°F, low 47°F. Winds 22 mph. 7-day outlook inside. Current conditions in Sumner County at 1:51 PM show a temperature of 61.2°F with a wind speed of 13.5 mph. The sky is…
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10/17/26: Overcast Morning with Temps in the Low 50s; High of 62 Later, Clearing Tonight with a Low Around 48Weather Today in Sumner County: Overcast, high 62°F, low 47°F. Winds 22 mph. 7-day outlook inside. Current conditions in Sumner County at 5:50 AM show a temperature of 51.8°F with overcast skies and a wind speed of 13.7…
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10/16/26: Overcast with a high of 73 and low of 50; current temp 54, wind 10.6 mph, no precipitation.Weather Today in Sumner County: Overcast, high 73°F, low 50°F. Winds 17 mph. 7-day outlook inside. At 7:00 PM in Sumner County, the current temperature is 54.5°F with winds from the west-northwest at 10.6 mph. There has…
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10/16/26: Overcast and Cool with a High of 73, Currently 60; Winds Up to 16.5 mph, Low Tonight 51.6, Precip Chance 9%.Weather Today in Sumner County: Overcast, high 73°F, low 51°F. Winds 21 mph. 7-day outlook inside. Current conditions in Sumner County at 1:51 PM show a temperature of 60.6°F with an overcast sky. The wind is blowing at…
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10/16/26: Clear Skies This Morning, High 73, Low 50 Tonight, Winds Up to 15 mph, Chance of Precipitation 16%Weather Today in Sumner County: Overcast, high 73°F, low 51°F. Winds 9 mph. 7-day outlook inside. Current conditions in Sumner County at 5:50 AM include a temperature of 68.7°F, with a light wind from the southeast at…
- 10/15/26: Mainly Clear Tonight with Low of 76, High Reached 91, Wind Up to 8.5, Precip Chance 19% Today
Sumner County Source At 7:00 PM in Sumner County, the current temperature is 83.7°F with a light wind from the southeast at 4.5 mph. There is no precipitation recorded, and the sky is mainly clear. Earlier today…
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10/15/26: Mainly Clear With Highs Near 92 and Lows Around 75, Winds Up to 10, Chance of Precipitation LowWeather Today in Sumner County: Overcast, high 92°F, low 72°F. Winds 14 mph. 7-day outlook inside. Current conditions in Sumner County at 1:51 PM show a temperature of 91.2°F with a light wind from the east at 8.6 mph…
- 10/15/26: Clear Skies Today with a High of 91.8, Low Tonight of 76.8; Wind Up to 10.4 mph, Chance of Precipitation 19%
Weather Today in Sumner County: Overcast, high 92°F, low 71°F. Winds 6 mph. 7-day outlook inside. At 5:50 AM in Sumner County, the temperature is currently 71.6°F with a light wind from the southeast at 3.9 mph. There…
Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Vincennes, IN reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyRobinson, records since 1895. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Vincennes 29 km
- Olney 19 km
- Princeton 48 km
- Robinson 34 km
- Mount Carmel 35 km
- Fairfield 57 km
- Flora 54 km
- Lawrenceville 16 km
- Sullivan 58 km
- Bicknell 49 km
- Newton 40 km
- Fort Branch 57 km
Forecasters' discussion
From the National Weather Service office in ILX, issued 3 hrs 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.