As of 13:08 CDT

Weather in Illiopolis, IL

87°

Illiopolis, Tuesday, 13 October, 13:08

Clear. Feels like 92°. High 87°, low 68°.

Pressure29.88 inHg

Wind8.1 mph SW

Humidity57%

Visibility6.2 mi

Dew point69°

See detailed hourly forecast

Wed, 1481° / 65°

0.46

81 °

Illiopolis, Wednesday, 14 October

Heavy rain. High 81°, low 65°.

Pressure30.03 inHg

Wind3.2 mph NE

Humidity67%

Visibility6.2 mi

Dew point66°

Thu, 1580° / 65°

0.78

80 °

Illiopolis, Thursday, 15 October

Heavy rain. High 80°, low 65°.

Pressure29.97 inHg

Wind10.4 mph SW

Humidity96%

Visibility1.4 mi

Dew point71°

Fri, 1664° / 50°

0.01

64 °

Illiopolis, Friday, 16 October

Light rain. High 64°, low 50°.

Pressure30.21 inHg

Wind24.4 mph NW

Humidity49%

Visibility6.2 mi

Dew point37°

Sat, 1758° / 40°

58 °

Illiopolis, Saturday, 17 October

Clear. High 58°, low 40°.

Pressure30.53 inHg

Wind0.6 mph SE

Humidity44%

Visibility6.2 mi

Dew point32°

Sun, 1865° / 44°

65 °

Illiopolis, Sunday, 18 October

Clear. High 65°, low 44°.

Pressure30.33 inHg

Wind11.2 mph SW

Humidity43%

Visibility—

Dew point38°

Mon, 1956° / 54°

0.12

56 °

Illiopolis, Monday, 19 October

Light rain. High 56°, low 54°.

Pressure30.24 inHg

Wind8.8 mph S

Humidity93%

Visibility—

Dew point53°

Tue, 2066° / 56°

0.02

66 °

Illiopolis, Tuesday, 20 October

Light rain. High 66°, low 56°.

Pressure30.27 inHg

Wind8.2 mph SE

Humidity74%

Visibility—

Dew point54°

Wed, 2169° / 60°

0.04

69 °

Illiopolis, Wednesday, 21 October

Light rain. High 69°, low 60°.

Pressure30.21 inHg

Wind11.1 mph S

Humidity76%

Visibility—

Dew point60°

Thu, 2278° / 64°

0.03

78 °

Illiopolis, Thursday, 22 October

Light rain. High 78°, low 64°.

Pressure30.03 inHg

Wind19.1 mph S

Humidity65%

Visibility—

Dew point59°

Fri, 2379° / 63°

79 °

Illiopolis, Friday, 23 October

Overcast. High 79°, low 63°.

Pressure29.97 inHg

Wind23.3 mph SW

Humidity48%

Visibility—

Dew point56°

Sat, 2462° / 51°

62 °

Illiopolis, Saturday, 24 October

Overcast. High 62°, low 51°.

Pressure30.36 inHg

Wind9.2 mph NW

Humidity35%

Visibility—

Dew point32°

Sun, 2563° / 50°

63 °

Illiopolis, Sunday, 25 October

Partly cloudy. High 63°, low 50°.

Pressure30.27 inHg

Wind9.2 mph NW

Humidity36%

Visibility—

Dew point33°

Mon, 2655° / 45°

55 °

Illiopolis, Monday, 26 October

Overcast. High 55°, low 45°.

Pressure30.24 inHg

Wind12.3 mph NW

Humidity41%

Visibility—

Dew point30°

Tue, 2758° / 40°

58 °

Illiopolis, Tuesday, 27 October

Overcast. High 58°, low 40°.

Pressure30.27 inHg

Wind7.8 mph SE

Humidity42%

Visibility—

Dew point31°

Wed, 2863° / 50°

63 °

Illiopolis, Wednesday, 28 October

Overcast. High 63°, low 50°.

Pressure30.06 inHg

Wind13.8 mph S

Humidity41%

Visibility—

Dew point32°

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.