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As of 13:57 CDT

Weather in Illiopolis, IL

70°Current weather

Illiopolis, Monday, 19 October, 13:57

Partly cloudy. Feels like 69°. High 70°, low 39°.

Pressure30.36 inHg
Wind4.5 mph SE
Humidity44%
Visibility6.2 mi
Dew point47°
Tue, 2070° / 41°0Clear
70 °Clear

Illiopolis, Tuesday, 20 October

Clear. High 70°, low 41°.

Pressure30.39 inHg
Wind3.1 mph SE
Humidity44%
Visibility6.2 mi
Dew point43°
Wed, 2170° / 44°0Clear
70 °Clear

Illiopolis, Wednesday, 21 October

Clear. High 70°, low 44°.

Pressure30.30 inHg
Wind1 mph SW
Humidity46%
Visibility6.2 mi
Dew point46°
Thu, 2270° / 48°0Clear
70 °Clear

Illiopolis, Thursday, 22 October

Clear. High 70°, low 48°.

Pressure30.30 inHg
Wind3.8 mph NE
Humidity50%
Visibility6.2 mi
Dew point49°
Fri, 2367° / 49°0Clear
67 °Clear

Illiopolis, Friday, 23 October

Clear. High 67°, low 49°.

Pressure30.33 inHg
Wind6.6 mph SE
Humidity56%
Visibility6.2 mi
Dew point47°
Sat, 2468° / 48°0Clear
68 °Clear

Illiopolis, Saturday, 24 October

Clear. High 68°, low 48°.

Pressure30.39 inHg
Wind8.2 mph SE
Humidity40%
Visibility—
Dew point38°
Sun, 2577° / 54°0Overcast
77 °Overcast

Illiopolis, Sunday, 25 October

Overcast. High 77°, low 54°.

Pressure30.30 inHg
Wind12.2 mph SW
Humidity31%
Visibility—
Dew point41°
Mon, 2672° / 59°0Overcast
72 °Overcast

Illiopolis, Monday, 26 October

Overcast. High 72°, low 59°.

Pressure30.21 inHg
Wind10.9 mph SW
Humidity36%
Visibility—
Dew point41°
Tue, 2764° / 45°0.11Light rain
64 °Light rain

Illiopolis, Tuesday, 27 October

Light rain. High 64°, low 45°.

Pressure30.00 inHg
Wind16.4 mph NW
Humidity50%
Visibility—
Dew point45°
Wed, 2844° / 33°0.01Light rain
44 °Light rain

Illiopolis, Wednesday, 28 October

Light rain. High 44°, low 33°.

Pressure30.36 inHg
Wind16.4 mph NW
Humidity30%
Visibility—
Dew point13°
Thu, 2953° / 30°0Clear
53 °Clear

Illiopolis, Thursday, 29 October

Clear. High 53°, low 30°.

Pressure30.27 inHg
Wind8.6 mph SW
Humidity23%
Visibility—
Dew point12°
Fri, 3051° / 38°0Overcast
51 °Overcast

Illiopolis, Friday, 30 October

Overcast. High 51°, low 38°.

Pressure30.03 inHg
Wind13.2 mph S
Humidity24%
Visibility—
Dew point13°
Sat, 3149° / 46°0.07Light rain
49 °Light rain

Illiopolis, Saturday, 31 October

Light rain. High 49°, low 46°.

Pressure30.09 inHg
Wind11.3 mph S
Humidity83%
Visibility—
Dew point42°
Sun, 0163° / 45°0.26Rain
63 °Rain

Illiopolis, Sunday, 1 November

Rain. High 63°, low 45°.

Pressure29.97 inHg
Wind18.5 mph NW
Humidity66%
Visibility—
Dew point46°
Mon, 0250° / 40°0Partly cloudy
50 °Partly cloudy

Illiopolis, Monday, 2 November

Partly cloudy. High 50°, low 40°.

Pressure30.15 inHg
Wind18.8 mph NW
Humidity44%
Visibility—
Dew point26°
Tue, 0350° / 37°0Overcast
50 °Overcast

Illiopolis, Tuesday, 3 November

Overcast. High 50°, low 37°.

Pressure30.00 inHg
Wind6.9 mph NW
Humidity56%
Visibility—
Dew point33°

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.