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As of 08:17 CDT

Weather in Illiopolis, IL

54°Current weather

Illiopolis, Sunday, 11 October, 08:17

Clear. Feels like 54°. High 80°, low 54°.

Pressure30.00 inHg
Wind3.4 mph E
Humidity97%
Visibility6.2 mi
Dew point54°
Mon, 1287° / 60°0Overcast
87 °Overcast

Illiopolis, Monday, 12 October

Overcast. High 87°, low 60°.

Pressure29.91 inHg
Wind10.7 mph SW
Humidity53%
Visibility6.2 mi
Dew point62°
Tue, 1388° / 71°0Clear
88 °Clear

Illiopolis, Tuesday, 13 October

Clear. High 88°, low 71°.

Pressure29.88 inHg
Wind9.7 mph SW
Humidity53%
Visibility6.2 mi
Dew point66°
Wed, 1479° / 70°0.41Rain
79 °Rain

Illiopolis, Wednesday, 14 October

Rain. High 79°, low 70°.

Pressure30.00 inHg
Wind2.4 mph NE
Humidity90%
Visibility2.8 mi
Dew point71°
Thu, 1577° / 64°0.23Light rain
77 °Light rain

Illiopolis, Thursday, 15 October

Light rain. High 77°, low 64°.

Pressure30.00 inHg
Wind11 mph SW
Humidity92%
Visibility—
Dew point71°
Fri, 1670° / 51°0.25Rain
70 °Rain

Illiopolis, Friday, 16 October

Rain. High 70°, low 51°.

Pressure30.36 inHg
Wind17.8 mph N
Humidity45%
Visibility—
Dew point39°
Sat, 1746° / 35°0Clear
46 °Clear

Illiopolis, Saturday, 17 October

Clear. High 46°, low 35°.

Pressure30.56 inHg
Wind13 mph N
Humidity25%
Visibility—
Dew point10°
Sun, 1855° / 32°0Clear
55 °Clear

Illiopolis, Sunday, 18 October

Clear. High 55°, low 32°.

Pressure30.53 inHg
Wind16.2 mph S
Humidity21%
Visibility—
Dew point11°
Mon, 1966° / 40°0Partly cloudy
66 °Partly cloudy

Illiopolis, Monday, 19 October

Partly cloudy. High 66°, low 40°.

Pressure30.39 inHg
Wind15.2 mph SW
Humidity20%
Visibility—
Dew point19°
Tue, 2068° / 45°0Overcast
68 °Overcast

Illiopolis, Tuesday, 20 October

Overcast. High 68°, low 45°.

Pressure30.33 inHg
Wind10.3 mph S
Humidity22%
Visibility—
Dew point24°
Wed, 2171° / 51°0Overcast
71 °Overcast

Illiopolis, Wednesday, 21 October

Overcast. High 71°, low 51°.

Pressure30.24 inHg
Wind11.1 mph S
Humidity25%
Visibility—
Dew point29°
Thu, 2274° / 53°0Overcast
74 °Overcast

Illiopolis, Thursday, 22 October

Overcast. High 74°, low 53°.

Pressure30.24 inHg
Wind8 mph S
Humidity29%
Visibility—
Dew point35°
Fri, 2379° / 60°0Partly cloudy
79 °Partly cloudy

Illiopolis, Friday, 23 October

Partly cloudy. High 79°, low 60°.

Pressure30.15 inHg
Wind9.3 mph SW
Humidity31%
Visibility—
Dew point42°
Sat, 2477° / 59°0Mostly clear
77 °Mostly clear

Illiopolis, Saturday, 24 October

Mostly clear. High 77°, low 59°.

Pressure30.12 inHg
Wind7.7 mph NE
Humidity47%
Visibility—
Dew point52°
Sun, 2582° / 45°0.05Light rain
82 °Light rain

Illiopolis, Sunday, 25 October

Light rain. High 82°, low 45°.

Pressure29.91 inHg
Wind14.5 mph SW
Humidity46%
Visibility—
Dew point55°
Mon, 2661° / 41°0Clear
61 °Clear

Illiopolis, Monday, 26 October

Clear. High 61°, low 41°.

Pressure30.09 inHg
Wind12 mph NW
Humidity42%
Visibility—
Dew point34°

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.