Install
Glen Carbon, IL Weather
Current conditions
Forecast for this hour (no station report in the last two hours)
Forecast
10-day-
Tonight
Mostly clear, with a low around 49. Southeast wind around 5 mph.
-
Sunday
Mostly sunny, with a high near 79. Southeast wind around 3 mph.
-
Sunday Night
Mostly cloudy, with a low around 52. Southeast wind around 2 mph.
National Weather Service forecast updated 13 hrs ago.
Hourly
Hourly forecast- Now66°
- 8 PM60°
- 9 PM59°
- 10 PM57°
- 11 PM56°
- Sun12 AM55°
- 1 AM54°
- 2 AM53°
- 3 AM52°
- 4 AM51°
- 5 AM51°
- 6 AM50°
- 7 AM49°
- 8 AM51°
- 9 AM55°
- 10 AM63°
- 11 AM68°
- 12 PM72°
- 1 PM76°
- 2 PM77°
- 3 PM77°
- 4 PM79°
- 5 PM77°
- 6 PM74°
10-day forecast
Details- TodayOct 24Mostly Sunny49°76°
- SunOct 25Mostly Sunny52°79°
- MonOct 26Partly Sunny52°78°
- TueOct 27Mostly Cloudy53°76°
- WedOct 28Mostly Sunny54°79°
- ThuOct 29Sunny53°78°
- FriOct 30Mostly Sunny19%54°77°
- SatOct 31Cloudy0.03 in58°76°
- SunNov 1Rain0.32 in64°76°
- MonNov 2Heavy rain0.44 in66°72°
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 Glen Carbon
More weather news-
Tracking a warm and sunny Friday and weekendTONIGHT: Mostly clear with patchy river valley fog. Lows around 50°. TOMORROW: Mostly sunny and warm with highs in the upper 70s. EXTENDED: We could see some patchy river valley fog again overnight, but another warm day…
-
Tracking patchy fog overnight, cool morningTONIGHT: Mostly clear with patchy fog in low lying areas. Lows in the upper 40s to around 50. TOMORROW: Mostly sunny and pleasant with highs in the upper 70s. EXTENDED: We'll be mainly clear tonight and with calm winds…
- A meteor shower from Halley’s Comet peaks over IL tonight. Here’s when to see it
A full “hunter’s moon” will soon peak over Illinois, along with an upcoming meteor shower from Halley’s Comet. The Orionid meteor shower will peak Wednesday night into Thursday morning, according to NASA. “The Orionids…
-
Tracking more clouds tonight, mild WednesdayABC17NEWS TONIGHT: Mostly cloudy and cool with lows in the upper 40s to around 50. TOMORROW: Mostly sunny and mild with highs in the lower 70s. EXTENDED: We'll be a touch warmer as a weak disturbance sends clouds our…
-
Tracking a cool night, pleasant TuesdayTONIGHT: Mostly clear and cool with lows in the mid-40s. TOMORROW: Mostly sunny and mild with highs in the lower 70s. EXTENDED: We'll be cool again overnight as temperatures fall to the mid-40s. We'll see gradual…
- St. Louis Weather Forecast Friday Through Thursday
St. Louis is trading late-summer warmth for a blustery fall reset Friday: mostly cloudy skies, a high near 55, and northwest winds around 17 mph with gusts up to 33 mph. A few rain showers could move through after 3…
- 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…
-
Strong El Niño likely means a milder winter for northern Illinois, climatologist saysAfter a record tornado year, northern Illinois may get a break: forecasters favor a warmer-than-average winter as El Niño strengthens in the Pacific. El Niño refers to a warming of the Pacific Ocean’s surface that…
-
Gorgeous weather continues for Central IllinoisWEDNESDAY: Warming up with sunny skies and calm conditions. High: 75 Low: 47 THURSDAY: Above average with sunny skies. High: 76 Low: 47 FRIDAY: Nice weather continues with sunny skies. High: 76 Low: 46 SATURDAY: Some…
-
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…
Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- SatModerate
- SunModerate
- MonModerate
St. Louis (Metro-east), 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
MonthlySt Louis Area, records since 1874. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- St. Louis 23 km
- Saint Charles 43 km
- Saint Peters 56 km
- Florissant 30 km
- Chesterfield 52 km
- Belleville 25 km
- Oakville 42 km
- University City 30 km
- Ballwin 52 km
- Upper Alton 23 km
- Granite City 15 km
- O'Fallon 18 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 1 hr ago
Key Messages
- Seasonably warm and predominantly dry conditions will persist through next week.
Short Term
Issued at 159 PM CDT Sat Oct 24 2026
An upper-level ridge will remain over the Mid-Mississippi River Valley, locked in place by an Omega Block spanning much of the CONUS. With very little change at the surface and low levels including a lack of substantial advection, temperatures will remain steady in the 70s to near 80 for highs and in the mid-40 to low-50s F for lows. The only thing of note otherwise is increasing, thicker upper-level clouds overspreading the region Sunday and Monday.
Long Term
Issued at 159 PM CDT Sat Oct 24 2026
Global model guidance is coming into a better agreement that the Omega Block will only ebb and flow in strength next week, keeping the Mid-Mississippi River Valley in southwesterly to broadly anticyclonic flow near the ridge as it shifts slightly eastward. The main impact of multiple upper-level troughs rounding the ridge will be waves of upper/mid-level clouds, but ensemble model probabilities of measurable rainfall are 20 to 40 percent in northeastern/central MO and west-central IL late Tuesday onward where forcing/moisture and wavering front clipping the area could be sufficient for a few brief periods of light showers. However, the consensus is that predominantly dry conditions and continued seasonably warm temperatures will persist through at least Friday with the NBM interquartile range of temperatures contracting at the expense of a warming trend in the 25th percentile.
The big question is: when does the Omega Block break down? There are some signals that at least increasing moisture return and continued passages of upper-level troughs in the southwesterly flow will be enough for increasing probabilities of measurable rainfall next weekend of 60 to 80+ percent. However, confidence is much lower that the pattern undergoes a significant change, with the breakdown of the Omega Block being delayed further and further into the future with successive model iterations.
Aviation
Issued at 554 PM CDT Sat Oct 24 2026
Dry and mainly VFR conditions are expected to continue through the period. The potential for river fog recurring at SUS or CPS remains too low to include in this issuance of the TAFs. Otherwise winds will remain below 10 knots.
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.