Weather in Illiopolis
Illiopolis has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 19°, and about 19 inches of snow falls in a normal winter. In November, a normal day reaches 52° and a normal night drops to 33°.
Getting the latest forecast from the National Weather Service…
Where today sits in Illiopolis’s year
Typical highs and lows month by month, from 30 years of NOAA records.
Weather talk
Road reports, first frosts and storm memories from neighbors in Illiopolis.
Your answer becomes a post in Town Square.
Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Illiopolis itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Mt Pulaski, IL (11 mi, snow) and Decatur Wtp, IL (16 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.