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Johnston City, IL 62951 Weather

It is 79°F and clear in Johnston City, IL 62951, observed at 12:45 PM CDT. Today: Mostly Sunny, high 81°F, low 57°F. Hourly and 10-day forecast from the National Weather Service. Times are local (CDT).

Johnston City, IL 62951 current weather

79°F

Clear

H 81° / L 57°Feels like 78°

Observed at Marion - Williamson County Regional Airport (4.9 mi away), 10/30/2026, 12:45 PM CDT

Hourly forecast

NWS, updated 10/30/2026, 12:01 PM PT

  1. Now80°
  2. 3 PM80°
  3. 4 PM81°
  4. 5 PM79°
  5. 6 PM76°
  6. 7 PM72°
  7. 8 PM67°
  8. 9 PM65°
  9. 10 PM64°
  10. 11 PM64°
  11. 12 AM63°Sat
  12. 1 AM62°
  13. 2 AM61°
  14. 3 AM61°
  15. 4 AM60°
  16. 5 AM59°
  17. 6 AM59°
  18. 7 AM58°
  19. 8 AM57°
  20. 9 AM60°
  21. 10 AM66°
  22. 11 AM70°
  23. 12 PM72°
  24. 1 PM73°
  25. 2 PM75°
  26. 3 PM75°
  27. 4 PM75°
  28. 5 PM76°
  29. 6 PM74°
  30. 7 PM71°
  31. 8 PM68°
  32. 9 PM65°
  33. 10 PM64°
  34. 11 PM63°
  35. 12 AM62°Sun
  36. 1 AM61°
  37. 1 AM61°
  38. 2 AM60°27%
  39. 3 AM59°40%
  40. 4 AM59°49%
  41. 5 AM58°66%
  42. 6 AM58°83%
  43. 7 AM57°83%
  44. 8 AM60°83%
  45. 9 AM63°83%
  46. 10 AM64°83%
  47. 11 AM64°83%
  48. 12 PM63°38%

10-day forecast

Tap a day for details

  • Today10/30Low 57°High 81°

    This Afternoon: Mostly sunny. High near 81, with temperatures falling to around 79 in the afternoon. East southeast wind around 6 mph.

    Tonight: Mostly cloudy. Low around 57, with temperatures rising to around 59 overnight. East wind around 6 mph.

    Mostly Sunny
  • Sat10/3166% chance of precipitationLow 57°High 77°

    Saturday: Cloudy, with a high near 77. East southeast wind around 7 mph.

    Saturday Night: Rain showers likely after 2am. Cloudy, with a low around 57. Southeast wind 2 to 7 mph. Chance of precipitation is 70%.

    Cloudy
  • Sun11/183% chance of precipitationLow 54°High 66°

    Sunday: Rain showers. Cloudy, with a high near 66. Southeast wind 6 to 10 mph. Chance of precipitation is 80%.

    Sunday Night: Cloudy, with a low around 54. Southeast wind 3 to 7 mph.

    Rain Showers
  • Mon11/226% chance of precipitationLow 59°High 70°

    Monday: A slight chance of rain showers after noon. Mostly cloudy, with a high near 70. South southeast wind 6 to 12 mph, with gusts as high as 18 mph.

    Monday Night: A chance of rain showers after midnight. Mostly cloudy, with a low around 59. South southeast wind 12 to 18 mph.

    Mostly Cloudy then Slight Chance Rain Showers
  • Tue11/357% chance of precipitationLow 56°High 74°

    Tuesday: A chance of rain showers before noon, then showers and thunderstorms likely. Mostly cloudy, with a high near 74. South southeast wind 15 to 20 mph, with gusts as high as 28 mph.

    Tuesday Night: Rain showers likely before midnight, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 56. South southeast wind 7 to 15 mph, with gusts as high as 18 mph.

    Showers And Thunderstorms Likely
  • Wed11/450% chance of precipitationLow 51°High 71°

    Wednesday: A chance of rain showers. Mostly cloudy, with a high near 71. South southwest wind 6 to 9 mph.

    Wednesday Night: A chance of rain showers before midnight. Mostly cloudy, with a low around 51. Northwest wind 1 to 5 mph.

    Chance Rain Showers
  • Thu11/520% chance of precipitationLow 47°High 68°

    Thursday: A slight chance of rain showers. Mostly cloudy, with a high near 68. Northwest wind 3 to 9 mph.

    Thursday Night: A slight chance of rain showers after midnight. Mostly cloudy, with a low around 47. Northwest wind around 5 mph.

    Slight Chance Rain Showers
  • Fri11/6Model blendLow 41°High 65°

    Friday: Partly cloudy. High near 65°. Low that night near 41°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Sat11/7Model blendLow 39°High 64°

    Saturday: Partly cloudy. High near 64°. Low that night near 39°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Sun11/8Model blend16% chance of precipitationLow 40°High 65°

    Sunday: Mostly cloudy. High near 65°. Low that night near 40°. About 0.22 in of precipitation.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

Forecast for 37.822, -88.952 from the NWS PAH office, updated 10/30/2026, 12:01 PM PT · Official forecast on weather.gov

Days 8 to 10: NOAA National Blend of Models, station KMDH (Murphysboro/S Illinois Arpt, 16 mi), model run 10/30/2026, 9:00 AM CDT

Hazardous weather outlookIssued 10/30/2026, 1:21 AM CDT

Jefferson-Wayne IL-Edwards-Wabash-Perry IL-Franklin-Hamilton- White-Jackson-Williamson-Saline-Gallatin-Union-Johnson-Pope- Hardin-Alexander-Pulaski-Massac-Gibson-Pike-Posey-Vanderburgh- Warrick-Spencer-Fulton-Hickman-Carlisle-Ballard-McCracken-Graves- Livingston-Marshall-Calloway-Crittenden-Lyon-Trigg-Caldwell- Union KY-Webster-Hopkins-Christian-Henderson-Daviess-McLean- Muhlenberg-Todd-Perry MO-Bollinger-Cape Girardeau-Wayne MO-Carter- Ripley-Butler-Stoddard-Scott-Mississippi-New Madrid- 121 AM CDT Fri Oct 30 2026 /221 AM EDT Fri Oct 30 2026/

This Hazardous Weather Outlook is for portions of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri.

Day one: Today and Tonight

No hazardous weather is expected at this time.

Days two through seven: Saturday through Thursday

A few thunderstorms are possible Tuesday into Wednesday. It is too early to determine if the storms will become strong or severe.

Spotter information statement

Spotter activation will not be needed.

Forecaster's discussionIssued 10/30/2026, 12:03 PM CDT

Key messages

- Warm and dry weather ends the week, including thru much of the day Saturday.

- Wet weather chances hit first this weekend, with best chances still between midnight Saturday night and midday Sunday; cumulative amounts totalling generally 1/4-3/4".

- Next best wet weather chances hit mid week next with another 3/4 to 1.5 inches cumulative rainfall potential.

- The onset of rain chances will drive temperatures closer to seasonal with upper 60s to lower 70s highs daily next week.

Discussion

Issued at 1200 PM CDT Fri Oct 30 2026

High pressure holds dry and warm weather into the first half of the weekend, although high clouds will increase and thicken. That occurs in advance of our first rain chance in awhile. The best chance of rain still looks to be between midnight Saturday night and midday Sunday, when the bulk of the 1/4 to 3/4 inches of cumulative rains should fall.

After this weekend, daily rain chances carry thru next week, with the best such chances Tuesday into Wednesday. That is when the bulk of the 3/4 to 1.5 inches cumulative rain falls over that time period, with some isolated higher totals upward to 2 inches possible farther west (Ozarks).

The onset of these rain chances means temperatures are driven back closer to seasonal norms with daily highs next week ranging from the upper half 60s to lower 70s. Adding to the more seasonal autumnal feel will be breezier winds with the aforementioned parent storm system's approach, arrival, and departure during the mid week period.

Aviation

Issued at 1200 PM CDT Fri Oct 30 2026

SCT-BKN 5-6K FT AGL bases seen on satellite may impact KMVN mainly, otherwise anticipate an increase from FEW-SCT250 to BKN-OVC250 at all terminals, thickening with time. Winds will remain on the light side while gradually veering to SE.

Watches, warnings and advisories

IL: None. MO: None. IN: None. KY: None.

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Next 6 hours

NWS hourly forecast

  1. Now80°Mostly Sunny1%5 mph
  2. 3 PM80°Mostly Sunny1%5 mph
  3. 4 PM81°Mostly Sunny0%6 mph
  4. 5 PM79°Mostly Sunny1%6 mph
  5. 6 PM76°Partly Cloudy0%5 mph
  6. 7 PM72°Partly Cloudy1%3 mph

Hourly details

Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShow

Radar and satellite

National radar

NEXRAD (up to 24 hours) and GOES

Latest

Frequently asked questions

What is the weather in Johnston City, IL 62951 right now?
The latest observation from Marion - Williamson County Regional Airport was 79°F and clear, reported at 10/30/2026, 12:45 PM CDT.
What is the high temperature today in Johnston City, IL 62951?
The National Weather Service forecast for this afternoon calls for a high near 81°F. Mostly Sunny.
Will it rain in Johnston City, IL 62951 in the next 24 hours?
The NWS hourly forecast does not show any hour with a 50% or higher chance of precipitation in the next 24 hours.
What is the 10-day forecast for Johnston City, IL 62951?
The first 7 days come from the National Weather Service forecast. Days 8 to 10 (Nov 6 to Nov 8) come from the NOAA National Blend of Models, with highs of 64°F to 65°F. Model guidance this far out often changes.
What time is sunrise and sunset in Johnston City, IL 62951 today?
Sunrise is about 7:19 AM CDT and sunset is about 5:59 PM CDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Johnston City, IL 62951?
At Carbondale Sewage Plt, the 1991 to 2020 normal high in October is 70°F and the normal low is 44°F.

Nearby hazards

Illinois hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:No thunderstorm risk area over this locationOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: Blake Fire (0 acres)

UV and air quality forecast

EPA and AirNow

AQI forecast today (St. Louis (Metro-east))
GoodPM2.5
AQI forecast tomorrow (St. Louis (Metro-east))
ModeratePM2.5

UV index guide · Air quality

Drought

By county

Williamson County, week of 10/27/2026

100% of the county is in moderate drought or worse.

Sun and moon

Local time, center of the area

Sunrise
7:19 AM
Sunset
5:59 PM
Daylight
10 hr 40 min
Moon
Waning Gibbous 77% lit
First light (civil dawn)
6:52 AM
Last light (civil dusk)
6:26 PM
Moonrise
9:45 PM
Moonset
12:28 PM

Normal October weather

Climate

Normal October high 70°, low 44°, precipitation 3.70 in for the month. 1991 to 2020 normals at Carbondale Sewage Plt, 13 mi away.

Other places nearby

Data sources

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About this data

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