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Saint Peters, MO Weather
Current conditions
Observed at St. Charles, St. Charles County Smartt Airport · 1 hr ago
Forecast
10-day-
Saturday Night
Mostly cloudy, with a low around 51.
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Sunday
Partly sunny, with a high near 78.
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Sunday Night
Mostly cloudy, with a low around 51.
National Weather Service forecast updated 4 days ago.
Hourly
Hourly forecast- Now60°
- Sun12 AM59°
- 1 AM58°
- 2 AM56°
- 3 AM54°
- 4 AM53°
- 5 AM52°
- 6 AM51°
- 7 AM52°
- 8 AM55°
- 9 AM59°
- 10 AM64°
- 11 AM68°
- 12 PM72°
- 1 PM75°
- 2 PM77°
- 3 PM78°
- 4 PM77°
- 5 PM75°
- 6 PM73°
- 7 PM70°
- 8 PM67°
- 9 PM64°
- 10 PM62°
10-day forecast
Details- TonightOct 19Mostly Clear46°
- TueOct 20Sunny47°72°
- WedOct 21Sunny45°72°
- ThuOct 22Sunny48°75°
- FriOct 23Sunny49°75°
- TodayOct 24Mostly Sunny51°76°
- SunOct 25Partly Sunny51°78°
- MonOct 26Partly Sunny74°
- TueOct 27Mostly sunny0.02 in50°60°
- WedOct 28Mostly sunny44°57°
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 Peters
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Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Saint Louis, MO 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 42 km
- O'Fallon 6 km
- Saint Charles 13 km
- Florissant 26 km
- Chesterfield 16 km
- Oakville 46 km
- Wildwood 24 km
- Wentzville 20 km
- University City 32 km
- Ballwin 24 km
- Upper Alton 43 km
- Granite City 43 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 5 hrs 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 4Conservative index and reflects what the press published. Terms of use.