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Collinsville, IL 62234 Weather
Current conditions
Observed at St. Louis Downtown Airport · 25 min ago
Forecast
10-day-
Friday
Sunny, with a high near 76. Southeast wind 2 to 6 mph.
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Friday Night
Mostly clear, with a low around 49. Southeast wind around 5 mph.
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Saturday
Mostly sunny, with a high near 76. Southeast wind around 5 mph.
National Weather Service forecast updated 16 hrs ago.
Hourly
Hourly forecast- Now70°
- 1 PM73°
- 2 PM74°
- 3 PM74°
- 4 PM76°
- 5 PM74°
- 6 PM70°
- 7 PM65°
- 8 PM60°
- 9 PM58°
- 10 PM57°
- 11 PM56°
- Sat12 AM55°
- 1 AM53°
- 2 AM52°
- 3 AM52°
- 4 AM50°
- 5 AM49°
- 6 AM49°
- 7 AM49°
- 8 AM49°
- 9 AM55°
- 10 AM61°
- 11 AM65°
10-day forecast
Details- TonightOct 22Clear49°
- TodayOct 23Sunny49°76°
- SatOct 24Mostly Sunny49°76°
- SunOct 25Mostly Sunny52°79°
- MonOct 26Partly Sunny52°78°
- TueOct 27Partly Sunny51°73°
- WedOct 28Mostly Sunny15%50°74°
- ThuOct 29Slight Chance Rain Showers then Mostly Sunny15%73°
- FriOct 30Partly cloudy45°60°
- SatOct 31Cloudy0.13 in47°64°
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 Collinsville
More weather news-
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…
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First Alert Weather Day Today: Low Severe Storm Chance 2 - 7PMKMOV - Outlying Areas Could See Frost Saturday AM and Sunday AM Today: Expect lots of cloud cover today with temperatures nearing 80°. Isolated Severe Storms Remain Possible this Afternoon from 2PM- 7PM: This is a…
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Damaging Winds Possible in Illinois and Missouri ThursdayParts of Missouri and most of Illinois are likely to experience the type of thunderstorm you'd expect to see during the Spring months. Forecasters are warning of a possible damaging wind event that will likely leave…
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This week's record heat caps hottest Jan.-Sept. on record in USIf it feels like summer never left, the numbers back you up. This week brought a fresh wave of record-breaking heat across the country, even as calendars flip toward Halloween. In a word: hot. According to U.S. National…
- Will colorful fall foliage peak soon in the metro-east? When to leaf peep
With October well underway, some leaves are beginning to turn in southwestern Illinois, but when will fall foliage peak? The southwestern Illinois region offers many picturesque spots to enjoy fall foliage, from hiking…
- Daily high-temperature records broken or tied on October 13 across parts of the central U.S.
Five daily high-temperature records were broken and one was tied at six sites across Kansas, Oklahoma, Missouri and Illinois on October 13, 2026. Temperatures at the sites reached 32.8–33.9°C (91–93°F), or 9.4–13.3°C…
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Tracking storms with heavy rain moving in late tonightTONIGHT: Warm with storms arriving late. Some storms may produce heavy rain and strong wind gusts. Lows in the upper 60s. TOMORROW: Rain and storms likely early, becoming more scattered by afternoon. Highs in the upper…
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Illinois to get brief taste of fall weather this weekMany different weather conditions are impacting Illinois this week. It started Monday with record heat. “Middle 90s in Metro East St. Louis,” said Meteorologist Paul Otto with Freese-Notis Weather during a Tuesday guest…
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A big cooldown will drop temperatures to their lowest levels in monthsA view of the Manhattan skyline illuminated at night, with autumn foliage in the foreground along the East River in New York City, on October 12. People visit Taughannock Falls State Park in Ithaca, New York, on October…
Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- FriModerate
- SatModerate
- SunModerate
St. Louis (Metro-east), IL reporting area · 2 hrs 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 19 km
- Saint Charles 44 km
- Saint Peters 57 km
- Florissant 32 km
- Chesterfield 51 km
- Belleville 18 km
- Oakville 37 km
- Wildwood 60 km
- University City 28 km
- Ballwin 50 km
- Upper Alton 29 km
- Granite City 14 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 5 hrs ago
Key Messages
- High pressure remains in place allowing for our dry and warm weather continues well into next week.
Short Term
Issued at 347 AM CDT Fri Oct 23 2026
A slow moving upper-level ridge continues to dominate over the central CONUS bringing dry and seasonably warm conditions to the Mid- Mississippi Valley. Seasonably warm high temperatures are being primarily driven by the ridge continuing its residence over the region. High temperatures today and through the weekend will remain in the mid to upper 70s, possibly reaching 80s in some areas. The over night low temperatures on the other hand will remain more seasonal. The dry air mass that remains in the region associated with the surface high has allowed for efficient radiative cooling through the region creating low temperatures into the upper 40s and low 50s. Low temperatures overnight are expected to continue to be in the upper 40s to low 50s through the weekend. The 40s will primarily be located in the river valleys and in southeastern MO and southwestern IL, where fewer clouds will allow for more radiative cooling.
Long Term
Issued at 347 AM CDT Fri Oct 23 2026
Over the western CONUS, a deep upper-level trough propagates to the northeast toward the central CONUS early next week. Guidance indicates that as this trough slowly moves to the northeast, its amplitude will decrease enough to the point where the cold front associated with the trough will stay well to the north of our forecast region Tuesday into Wednesday, and allow for a ridge to remain over the region. This will allow for continued dry and seasonably warm conditions to continue through this forecast period with high temperatures remaining in the 70s each day. Another trough and associated cold front then begin to build over the western CONUS before moving to the east toward the end of the week. Guidance is uncertain on the exact timing and magnitude of this cold front in Missouri. NBM guidance from yesterday had IQRs of 15-20 degrees on Thursday and Friday with the 25th percentiles in the lower to mid- 60s and 75th percentiles near 80, but the most recent runs have brought the IQRs closer to 10-15 degrees with 25th percentiles brought up into the 70s on Thursday and mid to upper 60s on Friday while keeping the 75th percentiles near 80. This hints that model guidance is either pushing the cold front further into the future or decreasing the magnitude of the front. Latest ensemble guidance has increased the chances of rain associated with moisture ahead of the front with a 20-50 percent chance of measurable rain by Friday evening across the region.
Aviation
Issued at 625 AM CDT Fri Oct 23 2026
High pressure remains in place over the region allowing for light winds and continued VFR conditions. There is a chance of fog at SUS and CPS early this morning due to the light to calm winds, but will be very spotty. SUS has already experienced a few observations of IFR visibilities, but have been short lived.
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.