Casey, IL Monthly Weather

Clark County2:03 PM CDT39.30°N, 87.99°WElevation 646 ft
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October 2026

Sun
Mon
Tue
Wed
Thu
Fri
Sat
1Avg 76°/50°
2Avg 76°/50°
375°/–Avg 75°/49°
476°/–Avg 75°/49°
583°/42°Avg 74°/49°
677°/40°Avg 74°/48°
788°/40°Avg 73°/48°
887°/43°Avg 73°/47°
971°/43°Avg 72°/47°
1076°/44°Avg 72°/46°
1165°/55°Avg 71°/46°
1285°/52°Avg 71°/46°
1391°/63°Avg 70°/45°
1495°/60°Avg 70°/45°
15Avg 69°/44°
1675°/49°0.94 inAvg 69°/44°
1762°/33°<0.01 inAvg 68°/44°
18Avg 68°/43°
1968°/33°Avg 67°/43°
20Avg 67°/42°
21 Sunny 75°/45°Avg 66°/42°
22 Sunny 75°/45°Avg 66°/42°
23 Sunny 73°/45°Avg 65°/41°
24 Mostly Sunny 73°/45°Avg 64°/41°
25 Mostly Sunny 76°/47°Avg 64°/40°
26 Partly Sunny 76°/48°Avg 63°/40°
27 Partly Sunny 70°/46°Avg 63°/40°
28 Partly cloudy 73°/52°Avg 62°/39°
29 Showers 72°/49°Avg 62°/39°
30 Sunny 60°/39°Avg 61°/39°
31Avg 61°/38°
Average high78° (normal 72°)
Average low44° (normal 46°)
Warmest / coldest95° / –
Precipitation0.94 in (normal 1.90 in to date)
Record high today88° (1908)
Record low today26° (2018)

Observed: Casey, 2 km away, records since 1893. Normals 1991–2020. Climate data from NOAA's Regional Climate Centers (ACIS); recent days are preliminary. Days ahead: the forecast.

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.