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As of 20:22 CDT

Weather in Illiopolis, IL

77°Current weather

Illiopolis, Saturday, 8 August, 20:22

Clear. Feels like 78°. High 87°, low 70°.

Pressure30.00 inHg
Wind4.5 mph SE
Humidity82%
Visibility6.2 mi
Dew point72°
Sun, 0993° / 71°0Clear
93 °Clear

Illiopolis, Sunday, 9 August

Clear. High 93°, low 71°.

Pressure29.94 inHg
Wind14.5 mph S
Humidity66%
Visibility6.2 mi
Dew point73°
Mon, 1093° / 75°0Partly cloudy
93 °Partly cloudy

Illiopolis, Monday, 10 August

Partly cloudy. High 93°, low 75°.

Pressure29.91 inHg
Wind14.5 mph SW
Humidity60%
Visibility6.2 mi
Dew point73°
Tue, 1193° / 73°0.1Light rain
93 °Light rain

Illiopolis, Tuesday, 11 August

Light rain. High 93°, low 73°.

Pressure29.83 inHg
Wind15.5 mph SW
Humidity64%
Visibility6.2 mi
Dew point69°
Wed, 1284° / 72°0.74Heavy rain
84 °Heavy rain

Illiopolis, Wednesday, 12 August

Heavy rain. High 84°, low 72°.

Pressure29.85 inHg
Wind1.3 mph N
Humidity83%
Visibility6.2 mi
Dew point76°
Thu, 1383° / 64°2.06Heavy rain
83 °Heavy rain

Illiopolis, Thursday, 13 August

Heavy rain. High 83°, low 64°.

Pressure29.94 inHg
Wind14.5 mph SE
Humidity66%
Visibility—
Dew point68°
Fri, 1478° / 65°0.01Light rain
78 °Light rain

Illiopolis, Friday, 14 August

Light rain. High 78°, low 65°.

Pressure30.06 inHg
Wind11.7 mph E
Humidity73%
Visibility—
Dew point65°
Sat, 1570° / 63°0.05Light rain
70 °Light rain

Illiopolis, Saturday, 15 August

Light rain. High 70°, low 63°.

Pressure30.24 inHg
Wind15.1 mph E
Humidity80%
Visibility—
Dew point59°
Sun, 1674° / 63°0.06Light rain
74 °Light rain

Illiopolis, Sunday, 16 August

Light rain. High 74°, low 63°.

Pressure30.09 inHg
Wind9.9 mph E
Humidity83%
Visibility—
Dew point65°
Mon, 1778° / 64°0.06Light rain
78 °Light rain

Illiopolis, Monday, 17 August

Light rain. High 78°, low 64°.

Pressure30.06 inHg
Wind6.6 mph NE
Humidity79%
Visibility—
Dew point67°
Tue, 1882° / 65°0Overcast
82 °Overcast

Illiopolis, Tuesday, 18 August

Overcast. High 82°, low 65°.

Pressure30.03 inHg
Wind5.9 mph E
Humidity71%
Visibility—
Dew point68°
Wed, 1984° / 62°0Overcast
84 °Overcast

Illiopolis, Wednesday, 19 August

Overcast. High 84°, low 62°.

Pressure29.91 inHg
Wind13.1 mph N
Humidity71%
Visibility—
Dew point72°
Thu, 2073° / 55°0Partly cloudy
73 °Partly cloudy

Illiopolis, Thursday, 20 August

Partly cloudy. High 73°, low 55°.

Pressure30.06 inHg
Wind14.1 mph NE
Humidity65%
Visibility—
Dew point56°
Fri, 2173° / 53°0Overcast
73 °Overcast

Illiopolis, Friday, 21 August

Overcast. High 73°, low 53°.

Pressure30.03 inHg
Wind12.8 mph E
Humidity58%
Visibility—
Dew point54°
Sat, 2279° / 60°0.07Light rain
79 °Light rain

Illiopolis, Saturday, 22 August

Light rain. High 79°, low 60°.

Pressure29.85 inHg
Wind13.9 mph S
Humidity71%
Visibility—
Dew point66°
Sun, 2387° / 67°0Clear
87 °Clear

Illiopolis, Sunday, 23 August

Clear. High 87°, low 67°.

Pressure29.94 inHg
Wind7.6 mph W
Humidity60%
Visibility—
Dew point67°

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.