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Saint Peters, MO 63376 Weather
Current conditions
Observed at St. Louis, Spirit Of St. Louis Airport · 31 min ago
Forecast
10-day-
This Afternoon
Sunny, with a high near 76. Wind around 0 mph.
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Tonight
Mostly clear, with a low around 48. Wind around 0 mph.
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Thursday
Sunny, with a high near 77. Wind around 0 mph.
National Weather Service forecast updated 45 min ago.
Hourly
Hourly forecast- Now74°
- 6 PM71°
- 7 PM67°
- 8 PM62°
- 9 PM59°
- 10 PM57°
- 11 PM56°
- Thu12 AM54°
- 1 AM53°
- 2 AM52°
- 3 AM51°
- 4 AM50°
- 5 AM49°
- 6 AM49°
- 7 AM48°
- 8 AM49°
- 9 AM54°
- 10 AM62°
- 11 AM68°
- 12 PM71°
- 1 PM75°
- 2 PM76°
- 3 PM76°
- 4 PM77°
10-day forecast
Details- TodayOct 21Sunny48°76°
- ThuOct 22Sunny49°77°
- FriOct 23Sunny48°76°
- SatOct 24Mostly Sunny49°76°
- SunOct 25Partly Sunny50°79°
- MonOct 26Partly Sunny50°77°
- TueOct 27Partly Sunny48°71°
- WedOct 28Partly cloudy50°76°
- ThuOct 29Rain0.08 in47°70°
- FriOct 30Sunny41°60°
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
More weather news- St. Louis Weather Forecast Friday Through Thursday
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First Alert Weather Day Today: Low Severe Storm Chance This Afternoon-Early EveningKMOV - Outlying Areas Could See Frost Saturday AM and Sunday AM Today: Scattered showers and storms push through the region during the morning hours. Temperatures remain into the upper 60s and lower 70s during this…
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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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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 41 km
- O'Fallon 7 km
- Saint Charles 12 km
- Florissant 26 km
- Chesterfield 14 km
- Oakville 44 km
- Wildwood 22 km
- Wentzville 20 km
- University City 31 km
- Ballwin 22 km
- Upper Alton 43 km
- Granite City 42 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 5 hrs ago
Key Messages
- Seasonably warm and dry weather will last through this weekend.
Short Term
Issued at 257 AM CDT Wed Oct 21 2026
No significant changes have been made to the forecast. The mid-level omega blocking pattern and surface high pressure influence will keep our sensible weather consistently dry, and insolation will act as the sole driver for our gradually warming temperatures. Expect highs generally in the mid-70s today and tomorrow with lows in the 40s to low-50s in between.
Long Term
Issued at 257 AM CDT Wed Oct 21 2026
The pattern begins to change late this week. A mid-level longwave trough circling over the Four Corners area is expected to split, with its poleward section phasing into another trough traversing western Canada. This shift will pull a cold front into the Upper Midwest Saturday and orient it zonally on Sunday as the shortwave zips into eastern Canada. The Mid-Mississippi Valley will remain well south of the cold front over the weekend, and our temperature trends will reflect that. LREF probabilities of 1pm temperatures >69 degrees Saturday and Sunday both range from 75-100%, and the NBM max temperature spread for each day is only 3 degrees. The cold front is expected to finally push into the region on Tuesday, but cooler weather is not guaranteed especially for locations south of I-70. Guidance suggests that the front may be weakening as it arrives, and that it may become stationary before it clears the area. This would mean that less cool air would filter into less of the CWA and that the warm streak may continue through Tuesday. Confidence in this, or for any solution, is still very low given the timeframe in question. Again, the NBM max temperature spread reflects this well as it climbs to 10+ degrees on Tuesday and nearly 20 degrees on Wednesday.
Aviation
Issued at 1157 AM CDT Wed Oct 21 2026
Surface high pressure is located across eastern OH/ western PA with mid clouds approaching the region from the west. VFR conditions are forecast to persist through the afternoon into the evening. Another upper level wave will move across southern Canada, helping to retrograde the surface ridge axis back to the northwest late this evening. Winds at the TAF sites will slowly back from the northeast before decoupling. Thursday morning, another round of morning river valley fog appears likely as winds go calm. The greatest threat for restrictions in visibilities will be at KSUS, while slightly lower chances at KJEF and KCPS. As the sun rises, mixing will quickly commence bringing an end to the river valley fog. VFR Thursday with no precipitation expected.
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.