As of 00:36 CDT

Weather in Illiopolis, IL

46°

Illiopolis, Saturday, 17 October, 00:36

Clear. Feels like 41°. High 60°, low 39°.

Pressure30.45 inHg

Wind10.4 mph N

Humidity80%

Visibility6.2 mi

Dew point40°

See detailed hourly forecast

Sun, 1863° / 41°

63 °

Illiopolis, Sunday, 18 October

Clear. High 63°, low 41°.

Pressure30.47 inHg

Wind9.4 mph S

Humidity39%

Visibility6.2 mi

Dew point34°

Mon, 1967° / 42°

67 °

Illiopolis, Monday, 19 October

Clear. High 67°, low 42°.

Pressure30.42 inHg

Wind4 mph S

Humidity45%

Visibility6.2 mi

Dew point42°

Tue, 2069° / 44°

69 °

Illiopolis, Tuesday, 20 October

Clear. High 69°, low 44°.

Pressure30.36 inHg

Wind2 mph SE

Humidity48%

Visibility6.2 mi

Dew point44°

Wed, 2170° / 45°

70 °

Illiopolis, Wednesday, 21 October

Overcast. High 70°, low 45°.

Pressure30.27 inHg

Wind3.8 mph S

Humidity40%

Visibility—

Dew point42°

Thu, 2275° / 49°

75 °

Illiopolis, Thursday, 22 October

Overcast. High 75°, low 49°.

Pressure30.18 inHg

Wind5.6 mph SE

Humidity36%

Visibility—

Dew point41°

Fri, 2377° / 55°

77 °

Illiopolis, Friday, 23 October

Overcast. High 77°, low 55°.

Pressure30.21 inHg

Wind8.1 mph SE

Humidity26%

Visibility—

Dew point35°

Sat, 2477° / 56°

77 °

Illiopolis, Saturday, 24 October

Overcast. High 77°, low 56°.

Pressure30.21 inHg

Wind9.5 mph S

Humidity24%

Visibility—

Dew point33°

Sun, 2564° / 55°

64 °

Illiopolis, Sunday, 25 October

Overcast. High 64°, low 55°.

Pressure30.30 inHg

Wind10.7 mph N

Humidity40%

Visibility—

Dew point38°

Mon, 2670° / 52°

70 °

Illiopolis, Monday, 26 October

Light rain. High 70°, low 52°.

Pressure30.30 inHg

Wind8.2 mph SE

Humidity37%

Visibility—

Dew point38°

Tue, 2769° / 58°

0.1

69 °

Illiopolis, Tuesday, 27 October

Light rain. High 69°, low 58°.

Pressure30.15 inHg

Wind10.4 mph S

Humidity45%

Visibility—

Dew point45°

Wed, 2862° / 51°

0.49

62 °

Illiopolis, Wednesday, 28 October

Rain. High 62°, low 51°.

Pressure30.12 inHg

Wind11.3 mph N

Humidity52%

Visibility—

Dew point42°

Thu, 2958° / 46°

0.51

58 °

Illiopolis, Thursday, 29 October

Rain. High 58°, low 46°.

Pressure29.94 inHg

Wind17.9 mph SE

Humidity89%

Visibility—

Dew point44°

Fri, 3067° / 51°

0.03

67 °

Illiopolis, Friday, 30 October

Light rain. High 67°, low 51°.

Pressure29.59 inHg

Wind19 mph W

Humidity62%

Visibility—

Dew point53°

Sat, 3156° / 47°

56 °

Illiopolis, Saturday, 31 October

Partly cloudy. High 56°, low 47°.

Pressure30.12 inHg

Wind16.5 mph NW

Humidity47%

Visibility—

Dew point35°

Sun, 0160° / 43°

60 °

Illiopolis, Sunday, 1 November

Clear. High 60°, low 43°.

Pressure30.15 inHg

Wind6.3 mph NW

Humidity49%

Visibility—

Dew point38°

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.