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As of 16:34 CDT

Weather in Illiopolis, IL

82°Current weather

Illiopolis, Sunday, 11 October, 16:34

Clear. Feels like 83°. High 82°, low 53°.

Pressure29.94 inHg
Wind6.3 mph S
Humidity51%
Visibility6.2 mi
Dew point62°
Mon, 1287° / 63°0Mostly clear
87 °Mostly clear

Illiopolis, Monday, 12 October

Mostly clear. High 87°, low 63°.

Pressure29.91 inHg
Wind12.4 mph SW
Humidity49%
Visibility6.2 mi
Dew point61°
Tue, 1388° / 69°0.07Rain
88 °Rain

Illiopolis, Tuesday, 13 October

Rain. High 88°, low 69°.

Pressure29.88 inHg
Wind9.2 mph SW
Humidity56%
Visibility6.2 mi
Dew point66°
Wed, 1479° / 69°0.17Rain
79 °Rain

Illiopolis, Wednesday, 14 October

Rain. High 79°, low 69°.

Pressure30.00 inHg
Wind4.3 mph NE
Humidity84%
Visibility6.2 mi
Dew point68°
Thu, 1576° / 67°0.37Light rain
76 °Light rain

Illiopolis, Thursday, 15 October

Light rain. High 76°, low 67°.

Pressure29.97 inHg
Wind10.6 mph S
Humidity90%
Visibility3.2 mi
Dew point72°
Fri, 1663° / 51°0.03Light rain
63 °Light rain

Illiopolis, Friday, 16 October

Light rain. High 63°, low 51°.

Pressure30.42 inHg
Wind18.7 mph N
Humidity47%
Visibility—
Dew point40°
Sat, 1751° / 40°0Clear
51 °Clear

Illiopolis, Saturday, 17 October

Clear. High 51°, low 40°.

Pressure30.62 inHg
Wind8.7 mph NE
Humidity34%
Visibility—
Dew point22°
Sun, 1860° / 36°0Clear
60 °Clear

Illiopolis, Sunday, 18 October

Clear. High 60°, low 36°.

Pressure30.50 inHg
Wind14.9 mph S
Humidity31%
Visibility—
Dew point23°
Mon, 1967° / 43°0Clear
67 °Clear

Illiopolis, Monday, 19 October

Clear. High 67°, low 43°.

Pressure30.42 inHg
Wind12.7 mph SW
Humidity27%
Visibility—
Dew point28°
Tue, 2070° / 50°0Overcast
70 °Overcast

Illiopolis, Tuesday, 20 October

Overcast. High 70°, low 50°.

Pressure30.33 inHg
Wind11.8 mph S
Humidity49%
Visibility—
Dew point45°
Wed, 2169° / 59°0.03Light rain
69 °Light rain

Illiopolis, Wednesday, 21 October

Light rain. High 69°, low 59°.

Pressure30.18 inHg
Wind13.1 mph S
Humidity56%
Visibility—
Dew point52°
Thu, 2267° / 63°0.04Light rain
67 °Light rain

Illiopolis, Thursday, 22 October

Light rain. High 67°, low 63°.

Pressure30.24 inHg
Wind13.4 mph S
Humidity76%
Visibility—
Dew point59°
Fri, 2368° / 64°0.02Light rain
68 °Light rain

Illiopolis, Friday, 23 October

Light rain. High 68°, low 64°.

Pressure30.12 inHg
Wind14.2 mph S
Humidity61%
Visibility—
Dew point52°
Sat, 2466° / 49°0.18Light rain
66 °Light rain

Illiopolis, Saturday, 24 October

Light rain. High 66°, low 49°.

Pressure30.06 inHg
Wind13.1 mph NW
Humidity87%
Visibility—
Dew point53°
Sun, 2553° / 44°0Overcast
53 °Overcast

Illiopolis, Sunday, 25 October

Overcast. High 53°, low 44°.

Pressure30.18 inHg
Wind10.4 mph NW
Humidity56%
Visibility—
Dew point36°
Mon, 2656° / 43°0Overcast
56 °Overcast

Illiopolis, Monday, 26 October

Overcast. High 56°, low 43°.

Pressure30.00 inHg
Wind17 mph NW
Humidity45%
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.