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Saint Charles, MO 63302 Weather
Current conditions
Observed at St. Louis Lambert International Airport · 20 min ago
Forecast
10-day-
Tonight
Mostly clear, with a low around 49. East wind around 3 mph.
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Wednesday
Sunny, with a high near 75. South wind around 2 mph.
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Wednesday Night
Mostly clear, with a low around 50. North wind around 3 mph.
National Weather Service forecast updated 4 hrs ago.
Hourly
Hourly forecast- Now54°
- 2 AM53°
- 3 AM52°
- 4 AM51°
- 5 AM50°
- 6 AM50°
- 7 AM50°
- 8 AM52°
- 9 AM56°
- 10 AM62°
- 11 AM66°
- 12 PM70°
- 1 PM72°
- 2 PM73°
- 3 PM74°
- 4 PM74°
- 5 PM73°
- 6 PM69°
- 7 PM65°
- 8 PM63°
- 9 PM61°
- 10 PM60°
- 11 PM58°
- Thu12 AM57°
10-day forecast
Details- TonightOct 20Mostly Clear49°
- TodayOct 21Sunny50°75°
- ThuOct 22Sunny50°75°
- FriOct 23Sunny50°75°
- SatOct 24Mostly Sunny53°77°
- SunOct 25Mostly Sunny53°80°
- MonOct 26Partly Sunny50°75°
- TueOct 27Partly Sunny68°
- WedOct 28Cloudy0.02 in43°58°
- ThuOct 29Sunny39°56°
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 Saint Charles
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Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Saint Louis, MO 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 30 km
- O'Fallon 19 km
- Saint Peters 13 km
- Florissant 14 km
- Chesterfield 16 km
- Belleville 52 km
- Oakville 38 km
- Wildwood 27 km
- Wentzville 32 km
- University City 21 km
- Ballwin 22 km
- Upper Alton 32 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 3 hrs ago
Key Messages
- Dry weather along with above normal temperatures are expected to continue through the week into this weekend.
Short Term
Issued at 226 PM CDT Tue Oct 20 2026
There's little change in the forecast this afternoon. An upper level ridge remains over the central CONUS sandwiched between troughs over both coasts. A sprawling surface ridge remains in control of the weather across the Great Lakes, Midwest, and Ohio Valley as well. The upper level omega block and surface ridge will remain in place through the short-term which will continue our stretch of uneventful weather. Temperatures across the forecast area are 3-5 degrees warmer today than yesterday, and it should continue to warm slowly tomorrow and Thursday due to good daytime insolation and light south to southeasterly flow.
Long Term
Issued at 226 PM CDT Tue Oct 20 2026
The omega block begins shifting east Thursday night, and the western trough moves over the Rockies by Friday evening. Medium range deterministic guidance shows the trough fracturing, and the resulting northern stream short wave moves across southern Canada and the northern Great Plains. The cold front attached to the surface reflection of the wave drifts through the Upper Midwest Saturday, and slows down to become nearly stationary across southern Minnesota, Michigan, and nothwest Iowa on Sunday. Models then show another upper level wave diving through southwest Canada Sunday night and into the northern Plains Monday where it phases with the left over southern stream energy. The combined positively tilted trough then digs southeast, which finally pushes the cold front through the Mid Mississippi Valley on Tuesday. All this adds up to continuing dry and warm weather for the Mid Mississippi Valley at least through the weekend south of the cold front, and probably for Monday and Tuesday as well. The LREF continues to show variance in the strength and position of the northern stream trough Friday/Saturday, and the combined trough Sunday through Tuesday. The variance mostly affects locations well north of our forecast area through the weekend. Temperature IQRs in the LREF are only 3-4 degrees in our area through Sunday. However, the IQR increases to 10 degrees across northeast Missouri and west central Illinois as the combined trough and cold front approach the area on Monday. The IQR spreads out to 10-15 degrees across the rest of the area on Tuesday as the members of the LREF attempt to push the front through. The deterministic NBM shows highs dropping from the mid and upper 70s on Sunday and Monday into the 60s Tuesday with the front. However, confidence in the forecast remains low early next week as guidance continues to have some issues with the placement of the front.
Aviation
Issued at 1000 PM CDT Tue Oct 20 2026
Mainly dry and VFR conditions are expected through the period with light winds.
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.