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As of 09:57 CDT

Weather in Illiopolis, IL

57°Current weather

Illiopolis, Tuesday, 20 October, 09:57

Clear. Feels like 56°. High 71°, low 44°.

Pressure30.39 inHg
Wind2.6 mph SE
Humidity77%
Visibility6.2 mi
Dew point50°
Wed, 2172° / 44°0Clear
72 °Clear

Illiopolis, Wednesday, 21 October

Clear. High 72°, low 44°.

Pressure30.27 inHg
Wind1.5 mph SW
Humidity45%
Visibility6.2 mi
Dew point45°
Thu, 2272° / 48°0Clear
72 °Clear

Illiopolis, Thursday, 22 October

Clear. High 72°, low 48°.

Pressure30.30 inHg
Wind1.4 mph NE
Humidity48%
Visibility6.2 mi
Dew point49°
Fri, 2369° / 49°0Clear
69 °Clear

Illiopolis, Friday, 23 October

Clear. High 69°, low 49°.

Pressure30.33 inHg
Wind5.5 mph SE
Humidity50%
Visibility6.2 mi
Dew point48°
Sat, 2471° / 50°0Partly cloudy
71 °Partly cloudy

Illiopolis, Saturday, 24 October

Partly cloudy. High 71°, low 50°.

Pressure30.36 inHg
Wind8.2 mph S
Humidity48%
Visibility—
Dew point46°
Sun, 2576° / 53°0Partly cloudy
76 °Partly cloudy

Illiopolis, Sunday, 25 October

Partly cloudy. High 76°, low 53°.

Pressure30.36 inHg
Wind6.1 mph S
Humidity44%
Visibility—
Dew point48°
Mon, 2673° / 50°0Overcast
73 °Overcast

Illiopolis, Monday, 26 October

Overcast. High 73°, low 50°.

Pressure30.12 inHg
Wind16 mph SW
Humidity30%
Visibility—
Dew point37°
Tue, 2750° / 40°0.06Light rain
50 °Light rain

Illiopolis, Tuesday, 27 October

Light rain. High 50°, low 40°.

Pressure30.45 inHg
Wind17.2 mph N
Humidity33%
Visibility—
Dew point20°
Wed, 2852° / 32°0Clear
52 °Clear

Illiopolis, Wednesday, 28 October

Clear. High 52°, low 32°.

Pressure30.42 inHg
Wind9.2 mph SW
Humidity38%
Visibility—
Dew point22°
Thu, 2958° / 37°0Partly cloudy
58 °Partly cloudy

Illiopolis, Thursday, 29 October

Partly cloudy. High 58°, low 37°.

Pressure30.12 inHg
Wind13.9 mph W
Humidity37%
Visibility—
Dew point29°
Fri, 3048° / 35°0Clear
48 °Clear

Illiopolis, Friday, 30 October

Clear. High 48°, low 35°.

Pressure30.39 inHg
Wind13.6 mph N
Humidity34%
Visibility—
Dew point19°
Sat, 3151° / 31°0Overcast
51 °Overcast

Illiopolis, Saturday, 31 October

Overcast. High 51°, low 31°.

Pressure30.30 inHg
Wind10.3 mph SW
Humidity27%
Visibility—
Dew point15°
Sun, 0154° / 39°0Overcast
54 °Overcast

Illiopolis, Sunday, 1 November

Overcast. High 54°, low 39°.

Pressure30.15 inHg
Wind10.8 mph SW
Humidity63%
Visibility—
Dew point37°
Mon, 0264° / 45°0Clear
64 °Clear

Illiopolis, Monday, 2 November

Clear. High 64°, low 45°.

Pressure30.30 inHg
Wind8.1 mph S
Humidity46%
Visibility—
Dew point38°
Tue, 0365° / 45°0Overcast
65 °Overcast

Illiopolis, Tuesday, 3 November

Overcast. High 65°, low 45°.

Pressure30.18 inHg
Wind16.2 mph S
Humidity39%
Visibility—
Dew point35°
Wed, 0464° / 51°0.83Heavy rain
64 °Heavy rain

Illiopolis, Wednesday, 4 November

Heavy rain. High 64°, low 51°.

Pressure29.94 inHg
Wind18.4 mph S
Humidity66%
Visibility—
Dew point49°

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.