As of 15:28 CDT

Weather in Illiopolis, IL

90°

Illiopolis, Monday, 12 October, 15:28

Clear. Feels like 93°. High 90°, low 62°.

Pressure29.83 inHg

Wind13 mph SW

Humidity46%

Visibility6.2 mi

Dew point66°

See detailed hourly forecast

Tue, 1390° / 66°

90 °

Illiopolis, Tuesday, 13 October

Clear. High 90°, low 66°.

Pressure29.88 inHg

Wind8.3 mph SW

Humidity54%

Visibility6.2 mi

Dew point65°

Wed, 1475° / 66°

0.51

75 °

Illiopolis, Wednesday, 14 October

Rain. High 75°, low 66°.

Pressure30.00 inHg

Wind4.1 mph N

Humidity86%

Visibility4.5 mi

Dew point69°

Thu, 1579° / 68°

0.63

79 °

Illiopolis, Thursday, 15 October

Rain. High 79°, low 68°.

Pressure30.00 inHg

Wind8.8 mph S

Humidity93%

Visibility2.2 mi

Dew point70°

Fri, 1662° / 49°

0.11

62 °

Illiopolis, Friday, 16 October

Light rain. High 62°, low 49°.

Pressure30.30 inHg

Wind20.9 mph NW

Humidity42%

Visibility6.2 mi

Dew point34°

Sat, 1760° / 41°

60 °

Illiopolis, Saturday, 17 October

Clear. High 60°, low 41°.

Pressure30.50 inHg

Wind6.6 mph S

Humidity36%

Visibility—

Dew point29°

Sun, 1866° / 44°

66 °

Illiopolis, Sunday, 18 October

Clear. High 66°, low 44°.

Pressure30.30 inHg

Wind10.8 mph S

Humidity32%

Visibility—

Dew point31°

Mon, 1971° / 49°

71 °

Illiopolis, Monday, 19 October

Overcast. High 71°, low 49°.

Pressure30.30 inHg

Wind10.7 mph S

Humidity48%

Visibility—

Dew point46°

Tue, 2073° / 58°

73 °

Illiopolis, Tuesday, 20 October

Light rain. High 73°, low 58°.

Pressure30.27 inHg

Wind8.1 mph S

Humidity58%

Visibility—

Dew point52°

Wed, 2177° / 58°

77 °

Illiopolis, Wednesday, 21 October

Clear. High 77°, low 58°.

Pressure30.18 inHg

Wind10.3 mph S

Humidity48%

Visibility—

Dew point52°

Thu, 2278° / 62°

78 °

Illiopolis, Thursday, 22 October

Overcast. High 78°, low 62°.

Pressure30.12 inHg

Wind14.9 mph S

Humidity39%

Visibility—

Dew point49°

Fri, 2381° / 66°

81 °

Illiopolis, Friday, 23 October

Overcast. High 81°, low 66°.

Pressure29.94 inHg

Wind19 mph S

Humidity38%

Visibility—

Dew point49°

Sat, 2470° / 52°

0.2

70 °

Illiopolis, Saturday, 24 October

Rain. High 70°, low 52°.

Pressure29.80 inHg

Wind20.3 mph SW

Humidity52%

Visibility—

Dew point45°

Sun, 2556° / 46°

56 °

Illiopolis, Sunday, 25 October

Overcast. High 56°, low 46°.

Pressure30.09 inHg

Wind12.1 mph NW

Humidity54%

Visibility—

Dew point35°

Mon, 2663° / 43°

63 °

Illiopolis, Monday, 26 October

Clear. High 63°, low 43°.

Pressure30.18 inHg

Wind6.2 mph SE

Humidity43%

Visibility—

Dew point35°

Tue, 2770° / 48°

70 °

Illiopolis, Tuesday, 27 October

Clear. High 70°, low 48°.

Pressure29.94 inHg

Wind15.8 mph N

Humidity37%

Visibility—

Dew point37°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Illiopolis, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Illiopolis, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.