Jerseyville, IL Weather

Jersey County3:34 PM CDT39.12°N, 90.33°WElevation 659 ft

Current conditions

Clear
73°
Clear
Feels like 73°
High 75°·Low 48°
WindSE 6 mph
Humidity33%
Dew point43°
Visibility10.0 mi
Cloud cover35%
UV index2 Low
Sunrise7:21 AM
Sunset6:12 PM

Observed at St. Louis Regional Airport · 1 hr ago

Forecast

10-day

  • Saturday

    Mostly sunny, with a high near 75. Southeast wind around 6 mph.

  • Saturday Night

    Mostly clear, with a low around 48. Southeast wind around 3 mph.

  • Sunday

    Mostly sunny, with a high near 78. South wind around 3 mph.

National Weather Service forecast updated 14 hrs ago.

Hourly

Hourly forecast
  1. Now Mostly Sunny 74°
  2. 4 PM Mostly Sunny 75°
  3. 5 PM Mostly Sunny 73°
  4. 6 PM Partly Cloudy 70°
  5. 7 PM Mostly Clear 65°
  6. 8 PM Mostly Clear 59°
  7. 9 PM Mostly Clear 58°
  8. 10 PM Mostly Clear 56°
  9. 11 PM Partly Cloudy 55°
  10. Sun12 AM Partly Cloudy 54°
  11. 1 AM Mostly Clear 54°
  12. 2 AM Partly Cloudy 52°
  13. 3 AM Mostly Clear 51°
  14. 4 AM Partly Cloudy 50°
  15. 5 AM Partly Cloudy 50°
  16. 6 AM Sunny 49°
  17. 7 AM Mostly Sunny 48°
  18. 8 AM Mostly Sunny 50°
  19. 9 AM Sunny 55°
  20. 10 AM Sunny 63°
  21. 11 AM Mostly Sunny 68°
  22. 12 PM Mostly Sunny 73°
  23. 1 PM Mostly Sunny 75°
  24. 2 PM Mostly Sunny 76°

10-day forecast

Details
  1. TonightOct 23 Partly Cloudy Partly Cloudy48°
  2. TodayOct 24 Mostly Sunny Mostly Sunny48°75°
  3. SunOct 25 Mostly Sunny Mostly Sunny51°78°
  4. MonOct 26 Partly Sunny Partly Sunny50°76°
  5. TueOct 27 Mostly Cloudy Mostly Cloudy51°74°
  6. WedOct 28 Mostly Sunny Mostly Sunny52°78°
  7. ThuOct 29 Sunny Sunny50°77°
  8. FriOct 30 Mostly Sunny Mostly Sunny75°
  9. SatOct 31 Cloudy Cloudy58°76°
  10. SunNov 1 Rain Rain0.36 in64°78°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
Open the National Weather Service radar (the map here needs JavaScript).

Weather news in Illinois

More weather news
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Air quality

58
Moderate
Ozone

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

Sunrise 7:21 AM
Sunset 6:12 PM
Daylight 10 h 50 min (−2 min 22 s tomorrow)
Waxing Gibbous · 98% lit
Moonrise 5:03 PM Moonset 5:37 AM
Full moon Oct 26 New moon Nov 9

Nearby

Forecasters' discussion

From the National Weather Service office in LSX, issued 3 hrs ago

Key Messages

- A stagnant pattern remains in place keeping warm and dry conditions through the end of the week.

Short Term

Issued at 228 AM CDT Sat Oct 24 2026

A slow moving upper-level ridge remains over the central CONUS keeping dry and seasonably warm conditions in the Mid-Mississippi Valley through the weekend and into Monday. As a result, very little change in the weather day-to-day is expected. The only change is the presence of some upper-level clouds. The stubborn ridge continues to drive high temperatures into the mid to upper 70s, with some areas possibly exceeding 80 on Sunday depending on the thickness of the clouds. Dry air will allow for radiative cooling overnight keeping low temperatures in the upper 40s to low 50s, with the 40s predominately being in the river valleys and southeastern MO and southwestern IL. This is due to the presence of fewer clouds in that region, which will allow for more efficient radiative cooling overnight.

Long Term

Issued at 228 AM CDT Sat Oct 24 2026

Over the western CONUS, a deep upper-level trough is present and is expected to propagate to the northeast toward the north-central CONUS and into the Midwest during the middle of the week. Guidance is in good consensus that as the trough tracks northeast it will reduce the amplitude of the ridge over the region. The current forecasted track of the trough will cause the associated cold front to stay well to the north of the region, resulting in dry and seasonably warm conditions in the region continuing through the entire week. High temperatures will remain in the 70s each day.

Earlier guidance had indicated a potential pattern change at the end of the week, but latest model trends indicate stronger confidence that the ridge remains in place through the end of the week. Yesterday, the NBM and LREF guidances continued to hint at the possibility of a cold front coming at the end of the week with IQRs of 10-15 degrees for Thursday and Friday, but latest runs have IQRs of 5-10 degrees by raising the 25th percentile from being in the 60s to being in the low 70s. At the same time, this model trend has also decreased the chance of rain at the end of the week down to 10-30 percent on Friday while increasing the chances the following weekend ahead of the potential cold front.

Aviation

Issued at 1156 AM CDT Sat Oct 24 2026

Dry and VFR flight conditions will persist along with light, mainly southeasterly winds. Patchy river valley fog is possible again Sunday morning, but confidence is low in any TAF sites being impacted.

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.