As of 11:10 CDT

Weather in Duncan, IL

59°

Duncan, Friday, 9 October, 11:10

Clear. Feels like 59°. High 79°, low 55°.

Pressure30.12 inHg

Wind7.9 mph SE

Humidity99%

Visibility6.2 mi

Dew point59°

See detailed hourly forecast

Sat, 1079° / 61°

79 °

Duncan, Saturday, 10 October

Overcast. High 79°, low 61°.

Pressure30.03 inHg

Wind7.7 mph S

Humidity54%

Visibility6.2 mi

Dew point56°

Sun, 1178° / 55°

78 °

Duncan, Sunday, 11 October

Clear. High 78°, low 55°.

Pressure29.94 inHg

Wind3.1 mph S

Humidity60%

Visibility6.2 mi

Dew point58°

Mon, 1285° / 66°

85 °

Duncan, Monday, 12 October

Mostly clear. High 85°, low 66°.

Pressure29.83 inHg

Wind12.2 mph SW

Humidity54%

Visibility6.2 mi

Dew point63°

Tue, 1376° / 67°

76 °

Duncan, Tuesday, 13 October

Clear. High 76°, low 67°.

Pressure29.85 inHg

Wind11.3 mph SW

Humidity68%

Visibility—

Dew point64°

Wed, 1469° / 61°

0.05

69 °

Duncan, Wednesday, 14 October

Light rain. High 69°, low 61°.

Pressure30.03 inHg

Wind11.1 mph E

Humidity70%

Visibility—

Dew point55°

Thu, 1562° / 54°

0.48

62 °

Duncan, Thursday, 15 October

Rain. High 62°, low 54°.

Pressure29.97 inHg

Wind13.3 mph SE

Humidity88%

Visibility—

Dew point53°

Fri, 1667° / 43°

1.01

67 °

Duncan, Friday, 16 October

Heavy rain. High 67°, low 43°.

Pressure29.94 inHg

Wind25.3 mph W

Humidity49%

Visibility—

Dew point35°

Sat, 1746° / 36°

46 °

Duncan, Saturday, 17 October

Overcast. High 46°, low 36°.

Pressure30.42 inHg

Wind22.9 mph NW

Humidity49%

Visibility—

Dew point26°

Sun, 1854° / 33°

54 °

Duncan, Sunday, 18 October

Mostly clear. High 54°, low 33°.

Pressure30.33 inHg

Wind13.6 mph S

Humidity40%

Visibility—

Dew point25°

Mon, 1963° / 41°

63 °

Duncan, Monday, 19 October

Overcast. High 63°, low 41°.

Pressure30.21 inHg

Wind11.5 mph SW

Humidity42%

Visibility—

Dew point35°

Tue, 2067° / 46°

67 °

Duncan, Tuesday, 20 October

Clear. High 67°, low 46°.

Pressure30.33 inHg

Wind8.9 mph S

Humidity34%

Visibility—

Dew point34°

Wed, 2170° / 52°

0.02

70 °

Duncan, Wednesday, 21 October

Light rain. High 70°, low 52°.

Pressure30.21 inHg

Wind13.4 mph S

Humidity43%

Visibility—

Dew point43°

Thu, 2260° / 53°

0.87

60 °

Duncan, Thursday, 22 October

Rain. High 60°, low 53°.

Pressure29.97 inHg

Wind15.6 mph SW

Humidity89%

Visibility—

Dew point55°

Fri, 2351° / 40°

51 °

Duncan, Friday, 23 October

Overcast. High 51°, low 40°.

Pressure30.06 inHg

Wind19.6 mph NW

Humidity59%

Visibility—

Dew point32°

Sat, 2446° / 34°

46 °

Duncan, Saturday, 24 October

Clear. High 46°, low 34°.

Pressure30.24 inHg

Wind12.7 mph N

Humidity54%

Visibility—

Dew point28°

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 Duncan, 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 Duncan, 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.