Install
Jerseyville, IL Weather
Current conditions
Forecast for this hour (no station report in the last two hours)
Forecast
10-day-
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.
-
Sunday Night
Mostly cloudy, with a low around 51. South wind around 2 mph.
National Weather Service forecast updated 17 hrs ago.
Hourly
Hourly forecast- Now65°
- 8 PM59°
- 9 PM58°
- 10 PM56°
- 11 PM55°
- Sun12 AM54°
- 1 AM54°
- 2 AM52°
- 3 AM51°
- 4 AM50°
- 5 AM50°
- 6 AM49°
- 7 AM48°
- 8 AM50°
- 9 AM55°
- 10 AM63°
- 11 AM68°
- 12 PM73°
- 1 PM75°
- 2 PM76°
- 3 PM78°
- 4 PM76°
- 5 PM76°
- 6 PM72°
10-day forecast
Details- TonightOct 23Partly Cloudy48°
- TodayOct 24Mostly Sunny48°75°
- SunOct 25Mostly Sunny51°78°
- MonOct 26Partly Sunny50°76°
- TueOct 27Mostly Cloudy51°74°
- WedOct 28Mostly Sunny52°78°
- ThuOct 29Sunny50°77°
- FriOct 30Mostly Sunny75°
- SatOct 31Cloudy58°76°
- SunNov 1Rain0.36 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 mapWeather news in Illinois
More weather news- Capitol Fax.com - Your Illinois News Radar » Good morning!
Thursday, Oct 22, 2026 - Posted by Isabel Miller DOMi & JD BECK, Herbie Hancock… - Barton - Thursday, Oct 22, 26 @ 8:53 am: Oh yeah, and you have to monitor comments between it all. Thank you for the lessons…
-
Strong El Niño likely means a milder winter for northern Illinois, climatologist saysAfter a record tornado year, northern Illinois may get a break: forecasters favor a warmer-than-average winter as El Niño strengthens in the Pacific. El Niño refers to a warming of the Pacific Ocean’s surface that…
-
Gorgeous weather continues for Central IllinoisWEDNESDAY: Warming up with sunny skies and calm conditions. High: 75 Low: 47 THURSDAY: Above average with sunny skies. High: 76 Low: 47 FRIDAY: Nice weather continues with sunny skies. High: 76 Low: 46 SATURDAY: Some…
-
Another beautiful day ahead for Central IllinoisDECATUR, Ill. (WAND) – If you’re looking for a reason to get outside, Tuesday is your day. A high-pressure system settling over the Midwest is bringing abundant sunshine and calm winds to Central Illinois, with…
- Central Illinois Winter Weather Outlook
The winter weather outlook for central and southeast Illinois has been released, and a detailed summary is available at this link. Some of the highlights: Current Conditions Latest Observations Daily Climate Maps…
-
One of the year’s most pleasant weather stretches arrives in Central IllinoisDECATUR, Ill. (WAND) – A beautiful stretch of sunshine and mild temperatures is settling into the region, and it’s the perfect time to get outside and enjoy it. High pressure is taking control of the Midwest, locking in…
-
A great week ahead for Central IllinoisWAND DECATUR, Ill. (WAND) – A wonderful weekend across Central Illinois carries into the start of the workweek. Overnight lows dip back into the upper 30s tonight with a small risk for patchy frost, though coverage will…
-
Sunshine, chilly mornings and a big warm-up ahead for central IllinoisCENTRAL ILLINOIS (25News Now) - Fall is making an appearance across central Illinois this weekend, but don’t get too comfortable with the chilly temperatures. After a cold start on Sunday morning, sunshine will help…
-
Overnight Frost Advisory for parts of Illinois, NW IndianaCBS News Colorado 10pm Saturday CBS News Detroit Weekend 11pm CBS News Los Angeles Weekend 9pm CBS News Philadelphia Weekend 11pm KDKA News Weekend 11pm CBS News Texas Weekend 10pm
-
Frost advisory back in effect for Central IllinoisWAND DECATUR, Ill. (WAND) – Another cool day starts the weekend across Central Illinois with highs Saturday only reaching the upper 50s under plenty of sunny skies. Strong high pressure remains in control keeping skies…
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
Nearby
- St. Louis 56 km
- O'Fallon 47 km
- Saint Charles 40 km
- Saint Peters 44 km
- Florissant 37 km
- Chesterfield 55 km
- Wentzville 57 km
- University City 52 km
- Upper Alton 28 km
- Granite City 49 km
- Maryland Heights 46 km
- East Saint Louis 57 km
Forecasters' discussion
From the National Weather Service office in LSX, issued 1 hr 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.