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Old Jamestown, MO Weather
Current conditions
Observed at St. Louis Lambert International Airport · 48 min ago
Forecast
10-day-
Tonight
Patchy fog after 5am. Clear, with a low around 47. East wind 0 to 3 mph.
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Friday
Patchy fog before 9am. Sunny, with a high near 75. Southeast wind 2 to 7 mph.
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Friday Night
Mostly clear, with a low around 48. Southeast wind around 6 mph.
National Weather Service forecast updated 10 hrs ago.
Hourly
Hourly forecast- Now56°
- Fri12 AM55°
- 1 AM54°
- 2 AM52°
- 3 AM51°
- 4 AM50°
- 5 AM49°
- 6 AM48°
- 7 AM48°
- 8 AM49°
- 9 AM54°
- 10 AM62°
- 11 AM66°
- 12 PM70°
- 1 PM72°
- 2 PM73°
- 3 PM74°
- 4 PM75°
- 5 PM73°
- 6 PM69°
- 7 PM65°
- 8 PM60°
- 9 PM58°
- 10 PM57°
10-day forecast
Details- TodayOct 22Sunny47°77°
- FriOct 23Patchy Fog then Sunny48°75°
- SatOct 24Mostly Sunny49°76°
- SunOct 25Mostly Sunny52°78°
- MonOct 26Partly Sunny51°78°
- TueOct 27Partly Sunny50°72°
- WedOct 28Mostly Sunny15%49°74°
- ThuOct 29Heavy showers0.31 in50°69°
- FriOct 30Partly cloudy45°58°
- SatOct 31Cloudy0.09 in47°61°
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 Old Jamestown
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Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- ThuModerate
- FriModerate
- SatModerate
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 24 km
- O'Fallon 36 km
- Saint Charles 18 km
- Saint Peters 30 km
- Florissant 6 km
- Chesterfield 32 km
- Belleville 44 km
- Oakville 41 km
- Wildwood 43 km
- Wentzville 49 km
- University City 20 km
- Ballwin 35 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 5 hrs ago
Key Messages
- Dry and seasonably warm conditions will persist through the weekend.
Short Term
Issued at 219 PM CDT Thu Oct 22 2026
A slow-moving upper-level ridge will dominate the Mid-Mississippi River Valley through the weekend with dry conditions continuing and only slight variations in above average temperatures. With a gradual exit of the surface high pressure center extending into the CWA this afternoon, the balance of airmass modification and subtle southeasterly low-level CAA through Friday followed by waves of upper-level clouds on Saturday and Sunday combined with weak southerly WAA will contribute to only slight fluctuations of high temperatures within the 70s F. Each night, the most favorable radiational cooling and coolest low temperatures in the 40s F will also become more and more confined to river valleys and southeastern MO/southwestern IL, closest to the high pressure and where clouds will be less prevalent and/or thinner. Patchy river valley fog is expected again Friday morning and potentially Saturday morning but coverage should be less.
Long Term
Issued at 219 PM CDT Thu Oct 22 2026
Global model guidance diverges considerably early to mid-next week in the evolution of an upper-level trough that propagates into the central CONUS Monday into Tuesday as the Omega Block breaks down. The track, amplitude, and tilt of this trough vary across guidance including whether an associated cold front passes through the CWA Tuesday or early Wednesday, enters and then stalls in the CWA, or stalls before reaching the CWA altogether. Accordingly, the NBM interquartile range increases to between 7 and 15 F Tuesday onward, with the 75th percentile remaining steady and the 25th percentile cooling closer to average. If the front reaches the CWA, showers will also become possible, with greatest probabilities of measurable rainfall in global ensemble models across central/northeastern MO and west-central IL at 30 to 50 percent. However, a widespread, substantial rainfall appears unlikely in the ranges of current scenarios. The aforementioned uncertainties persist through the end of the forecast period, late next week.
Aviation
Issued at 619 PM CDT Thu Oct 22 2026
Dry and mainly VFR conditions are expected through the period. There will be some fog late tonight into early Friday in low lying areas with MVFR and possible IFR visibilities including at SUS and CPS. Otherwise winds are expected to remain light.
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.