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Mount Vernon, IL Weather
Current conditions
Observed at Centralia Municipal Airport · 1 hr ago
Forecast
10-day-
Tonight
Clear. Low around 46, with temperatures rising to around 48 overnight. East northeast wind around 2 mph.
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Friday
Sunny. High near 75, with temperatures falling to around 73 in the afternoon. East wind 1 to 5 mph.
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Friday Night
Clear, with a low around 46. East wind around 3 mph.
National Weather Service forecast updated 13 hrs ago.
Hourly
Hourly forecast- Now51°
- 2 AM51°
- 3 AM50°
- 4 AM48°
- 5 AM48°
- 6 AM47°
- 7 AM46°
- 8 AM48°
- 9 AM54°
- 10 AM62°
- 11 AM66°
- 12 PM70°
- 1 PM72°
- 2 PM73°
- 3 PM74°
- 4 PM75°
- 5 PM73°
- 6 PM70°
- 7 PM65°
- 8 PM60°
- 9 PM57°
- 10 PM55°
- 11 PM54°
- Sat12 AM53°
Daily forecast
Details- ThuOct 22Sunny46°77°
- TodayOct 23Sunny46°75°
- SatOct 24Sunny47°76°
- SunOct 25Mostly Sunny49°78°
- MonOct 26Partly Sunny50°77°
- TueOct 27Partly Sunny49°74°
- WedOct 28Mostly Sunny48°74°
- ThuOct 29Sunny38°59°
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 Mount Vernon
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Sun & moon
Almanac
MonthlyMt Vernon 3 Ne, records since 1895. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Herrin 58 km
- Centralia 31 km
- West Frankfort 47 km
- Salem 35 km
- Benton 36 km
- Du Quoin 45 km
- Pinckneyville 49 km
- Fairfield 48 km
- Flora 53 km
- Johnston City 55 km
- Carlyle 52 km
- Nashville 42 km
Forecasters' discussion
From the National Weather Service office in PAH, issued 7 hrs ago
Key Messages
- Patchy fog is possible early this morning near bodies of water.
- Temperatures will remain seasonable, if not slightly above average, into early next week.
- No precipitation is expected through early next week.
Discussion
Issued at 1234 PM CDT Thu Oct 22 2026
An omega block remains in place at 250 mb, albeit with a slightly degraded eastern upper-level low. The CWA remains on the eastern edge of this pattern nonetheless, and the ridge axis is set comfortably along a positive slope from Laredo, Texas, through to Lake Superior. Easterly progression of the ridge axis is expected to increase in speed by mid-day Saturday, though some disagreement in the evolution of the western-most trough exists between models. Currently, the 12z GFS indicates a Tuesday morning shortwave disturbance with a vort max over western Missouri. However, 06z ECMWF contains a strong zonal component and a significantly weaker shortwave centered on western Iowa. Ensemble modeling (GEFS) remains more in line with the ECMWF. Regardless of the troughs exact location, poor moisture return from the Gulf will strongly inhibit the potential for severe weather, yet alone precipitation. Some small precipitation chances may return to the forecast Tuesday but it is dry for now.
No notable changes to surface flow and conditions have occurred, and similar morning fog conditions will exist tomorrow morning around bodies of water. Any fog should erode with surface heating by 15z.
Aviation
Issued at 605 PM CDT Thu Oct 22 2026
With the exception of the possibility of some shallow MVFR fog at CGI later tonight, VFR conditions expected through the end of the period. Winds should go mainly calm overnight and then pick back up out of the east and northeast tomorrow at around 6 kts.
Pah Watches
IL...None. MO...None. IN...None. KY...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 4Conservative index and reflects what the press published. Terms of use.