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Washington, IL Weather
Current conditions
Observed at Peoria - General Downing-Peoria International Airport · 38 min ago
Forecast
10-day-
This Afternoon
Sunny, with a high near 73. West southwest wind around 3 mph.
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Tonight
Mostly clear, with a low around 49. Northwest wind around 1 mph.
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Thursday
Sunny, with a high near 75. North wind around 1 mph.
National Weather Service forecast updated 2 hrs ago.
Hourly
Hourly forecast- Now73°
- 5 PM72°
- 6 PM69°
- 7 PM65°
- 8 PM61°
- 9 PM59°
- 10 PM58°
- 11 PM56°
- Thu12 AM54°
- 1 AM53°
- 2 AM52°
- 3 AM52°
- 4 AM51°
- 5 AM50°
- 6 AM50°
- 7 AM49°
- 8 AM51°
- 9 AM55°
- 10 AM62°
- 11 AM67°
- 12 PM70°
- 1 PM73°
- 2 PM74°
- 3 PM74°
Daily forecast
Details- TodayOct 21Sunny49°73°
- ThuOct 22Sunny49°75°
- FriOct 23Sunny49°75°
- SatOct 24Mostly Sunny50°73°
- SunOct 25Partly Sunny51°76°
- MonOct 26Partly Sunny49°74°
- TueOct 27Partly Sunny10%46°66°
- WedOct 28Rain0.19 in47°52°
- ThuOct 29Sunny43°59°
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 Washington
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Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- WedModerate
- ThuModerate
- FriModerate
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
MonthlyGeneral Wayne A. Downing International Ap, records since 1896. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Peoria 15 km
- North Peoria 15 km
- Bloomington 43 km
- Normal 41 km
- Pekin 25 km
- East Peoria 15 km
- Morton 11 km
- Canton 55 km
- Bartonville 21 km
- Chillicothe 25 km
- Peoria Heights 15 km
- Eureka 12 km
Forecasters' discussion
From the National Weather Service office in ILX, issued 3 hrs ago
Key Messages
- Sunny mild days and cool nights persist across central and southeast Illinois through Sunday, with highs in the mid- upper 70s and lows in the 40s.
- A cold front moves across the region early next week, bringing prospects for light rain, followed by cooler temperatures.
Discussion
Issued at 1211 PM CDT Wed Oct 21 2026
Surface ridge axis centered across the area provides quiet, clear conditions across central and southeast Illinois. Dry air and subsidence will continue to produce mainly clear skies and large diurnal temperature swings over the next several days.
Mid-level heights build across the Mississippi Valley Friday and this weekend as the surface high slips farther east. Models show strong consensus on establishing persistent southerly return flow. 850-hPa temperatures in the lower teens C, along with deeper mixing support afternoon highs around 80F on Sunday, around 15 degrees above climatological averages.
Medium-range deterministic solutions (ECMWF, ECMWF-AI, and GFS) and the ensemble suite diverge early next week regarding the progression of an upstream longwave trough and associated surface cold front. The deterministic GFS exhibits a faster frontal transit across central Illinois Monday evening with stronger pre-frontal 850-hPa flow (4050 kt). Conversely, the ECMWF and ECMWF-AI are roughly 6 to 12 hours slower, maintaining a broader frontal structure and tracking the primary boundary through the forecast area Tuesday. GEFS and ECMWF ensemble members favor this slower progression. Latest NBM run has lowered PoPs below mentionable levels, but this will likely change as the system develops. Behind the front, a shot of cooler air will move in, returning temperatures to more seasonable levels Tue-Wed.
Aviation
Issued at 1211 PM CDT Wed Oct 21 2026
Another cycle of VFR conditions and light/variable winds with high pressure in control.
Ilx Watches
None.
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.