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As of 06:07 CDT

Weather in Illinois City, IL

67°Current weather

Illinois City, Sunday, 9 August, 06:07

Overcast. Feels like 68°. High 91°, low 66°.

Pressure29.94 inHg
Wind6.5 mph S
Humidity91%
Visibility6.2 mi
Dew point65°
Mon, 1089° / 71°0.01Light rain
89 °Light rain

Illinois City, Monday, 10 August

Light rain. High 89°, low 71°.

Pressure29.88 inHg
Wind1.7 mph NW
Humidity63%
Visibility6.2 mi
Dew point71°
Tue, 1190° / 71°0Light rain
90 °Light rain

Illinois City, Tuesday, 11 August

Light rain. High 90°, low 71°.

Pressure29.80 inHg
Wind9.1 mph SW
Humidity69%
Visibility6.2 mi
Dew point71°
Wed, 1283° / 69°0.11Rain
83 °Rain

Illinois City, Wednesday, 12 August

Rain. High 83°, low 69°.

Pressure29.83 inHg
Wind5.5 mph NE
Humidity63%
Visibility6.2 mi
Dew point70°
Thu, 1377° / 62°0.07Light rain
77 °Light rain

Illinois City, Thursday, 13 August

Light rain. High 77°, low 62°.

Pressure29.97 inHg
Wind10.6 mph NE
Humidity65%
Visibility—
Dew point62°
Fri, 1472° / 62°1.72Heavy rain
72 °Heavy rain

Illinois City, Friday, 14 August

Heavy rain. High 72°, low 62°.

Pressure30.15 inHg
Wind12.1 mph E
Humidity69%
Visibility—
Dew point58°
Sat, 1571° / 61°0.06Light rain
71 °Light rain

Illinois City, Saturday, 15 August

Light rain. High 71°, low 61°.

Pressure30.18 inHg
Wind12 mph E
Humidity81%
Visibility—
Dew point61°
Sun, 1678° / 66°0.02Light rain
78 °Light rain

Illinois City, Sunday, 16 August

Light rain. High 78°, low 66°.

Pressure30.09 inHg
Wind6.6 mph N
Humidity81%
Visibility—
Dew point69°
Mon, 1782° / 65°0Overcast
82 °Overcast

Illinois City, Monday, 17 August

Overcast. High 82°, low 65°.

Pressure30.09 inHg
Wind5.3 mph N
Humidity66%
Visibility—
Dew point66°
Tue, 1883° / 66°0Overcast
83 °Overcast

Illinois City, Tuesday, 18 August

Overcast. High 83°, low 66°.

Pressure29.97 inHg
Wind12.6 mph S
Humidity65%
Visibility—
Dew point66°
Wed, 1992° / 72°0Overcast
92 °Overcast

Illinois City, Wednesday, 19 August

Overcast. High 92°, low 72°.

Pressure29.80 inHg
Wind13.5 mph S
Humidity59%
Visibility—
Dew point70°
Thu, 2089° / 76°0Overcast
89 °Overcast

Illinois City, Thursday, 20 August

Overcast. High 89°, low 76°.

Pressure29.77 inHg
Wind8.5 mph SE
Humidity52%
Visibility—
Dew point67°
Fri, 2188° / 74°0Overcast
88 °Overcast

Illinois City, Friday, 21 August

Overcast. High 88°, low 74°.

Pressure29.91 inHg
Wind11.7 mph NE
Humidity55%
Visibility—
Dew point67°
Sat, 2296° / 71°0Clear
96 °Clear

Illinois City, Saturday, 22 August

Clear. High 96°, low 71°.

Pressure29.80 inHg
Wind14.9 mph SE
Humidity49%
Visibility—
Dew point68°
Sun, 2393° / 80°0Light rain
93 °Light rain

Illinois City, Sunday, 23 August

Light rain. High 93°, low 80°.

Pressure29.83 inHg
Wind20.4 mph SW
Humidity57%
Visibility—
Dew point71°
Mon, 2486° / 69°0.15Light rain
86 °Light rain

Illinois City, Monday, 24 August

Light rain. High 86°, low 69°.

Pressure30.00 inHg
Wind13.4 mph NE
Humidity65%
Visibility—
Dew point69°

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 Illinois City, 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 Illinois City, 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.