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Spring Valley, IL Weather
Current conditions
Observed at Sterling Rockfalls · 31 min ago
Forecast
10-day-
Tonight
Clear. Low around 42, with temperatures rising to around 44 overnight. Northeast wind around 0 mph.
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Wednesday
Sunny. High near 73, with temperatures falling to around 71 in the afternoon. West wind around 0 mph.
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Wednesday Night
Mostly clear. Low around 46, with temperatures rising to around 48 overnight. Wind around 0 mph.
National Weather Service forecast updated 2 hrs ago.
Hourly
Hourly forecast- Now50°
- Wed12 AM49°
- 1 AM48°
- 2 AM46°
- 3 AM46°
- 4 AM45°
- 5 AM44°
- 6 AM43°
- 7 AM43°
- 8 AM45°
- 9 AM49°
- 10 AM57°
- 11 AM62°
- 12 PM66°
- 1 PM70°
- 2 PM71°
- 3 PM72°
- 4 PM73°
- 5 PM71°
- 6 PM68°
- 7 PM65°
- 8 PM59°
- 9 PM57°
- 10 PM55°
10-day forecast
Details- TonightOct 20Clear42°
- WedOct 21Sunny46°73°
- ThuOct 22Sunny48°74°
- FriOct 23Sunny49°72°
- SatOct 24Mostly Sunny52°74°
- SunOct 25Partly Sunny50°74°
- MonOct 26Partly Sunny13%45°67°
- TueOct 27Mostly Sunny10%62°
- WedOct 28Sunny36°51°
- ThuOct 29Partly cloudy33°55°
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-
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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…
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Dangerous Freeze Warnings Issued for Iowa, Wisconsin, Minnesota and Illinois as Temperatures DropFreeze Warnings take effect early Saturday across much of Iowa, Wisconsin, southeast and central Minnesota and northern Illinois, with lows as cold as 26 degrees expected. Seven National Weather Service offices issued…
Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- TueGood
- WedModerate
- ThuModerate
Peoria, 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
MonthlyOttawa 4sw, records since 1890. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Ottawa 30 km
- Streator 38 km
- Peru 6 km
- La Salle 9 km
- Princeton 23 km
- Sandwich 60 km
- Mendota 25 km
- Chillicothe 51 km
- Marseilles 41 km
- Lake Holiday 54 km
- Oglesby 12 km
- Deer Park 14 km
Forecasters' discussion
From the National Weather Service office in DVN, issued 5 hrs ago
Key Messages
- Above normal temperatures are forecast to continue this week and there is a 55% chance they they will continue through the end of October.
Short Term
Issued at 109 PM CDT Tue Oct 20 2026
Ridging is forecast to continue to build northward across Iowa through the day on Wednesday. Shortwave energy near the ridge axis may bring periods of clouds through the area especially tonight into Wednesday morning. Nudged temperatures downward by 1 to 2 degrees tonight and Wednesday night based on trends from the past several nights. Based on persistence high temperatures on Wednesday will be 1 to 2 degrees warmer than todays with southerly winds around 5 MPH.
Long Term
Issued at 109 PM CDT Tue Oct 20 2026
Thursday through Saturday, ridging is forecast to build northward into southern Canada as high pressure at the surface moves into the Mid Atlantic states. As the surface high moves off shore Friday into Saturday, the pressure gradient across the Midwest will gradually tighten leading to potentially breezy conditions Friday into Saturday. High temperatures will gradually modify each day with highs in the 70s. Cloud cover may also increase Friday into Saturday as a storm system develops to our west.
Sunday through Monday, a 500 mb shortwave trough is forecast to dig into the Upper Midwest. This pushes a cold front southeastward across the area early next week. This front will gradually become parallel to the flow as it moves southeastward early next week causing it to stall out in southern Iowa or northern Missouri. The NBM has 15 to 25% chance POPs Sunday night through Monday across the area. High temperatures on Sunday remain in the lower to mid 70s ahead of the front with temperatures falling into the 60s on Monday behind the front. Despite cooler high temperatures, these remain above normal for the last week of October when high temperatures are normally in the mid to upper 50s. Rainfall amounts will be light with less than a tenth of an inch for rainfall.
Aviation
Issued at 611 PM CDT Tue Oct 20 2026
VFR conditions will continue as an area of high pressure remains in control over the next few days. Light southeast winds this evening will slowly turn more southwesterly during the daylight hours Wednesday, remaining light (generally 5 knots or less). Outside of some high cirrus clouds, SKC will be abundant.
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.