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As of 14:21 CDT

Weather in Duncan, IL

78°Current weather

Duncan, Saturday, 8 August, 14:21

Clear. Feels like 79°. High 83°, low 69°.

Pressure30.03 inHg
Wind5.2 mph N
Humidity73%
Visibility6.2 mi
Dew point69°
Sun, 0992° / 67°0Overcast
92 °Overcast

Duncan, Sunday, 9 August

Overcast. High 92°, low 67°.

Pressure29.88 inHg
Wind13.1 mph SW
Humidity68%
Visibility6.2 mi
Dew point75°
Mon, 1089° / 76°0Overcast
89 °Overcast

Duncan, Monday, 10 August

Overcast. High 89°, low 76°.

Pressure29.91 inHg
Wind10.2 mph W
Humidity65%
Visibility6.2 mi
Dew point73°
Tue, 1189° / 72°0.01Light rain
89 °Light rain

Duncan, Tuesday, 11 August

Light rain. High 89°, low 72°.

Pressure29.80 inHg
Wind13 mph SW
Humidity67%
Visibility6.2 mi
Dew point70°
Wed, 1278° / 69°0.07Light rain
78 °Light rain

Duncan, Wednesday, 12 August

Light rain. High 78°, low 69°.

Pressure29.88 inHg
Wind8.9 mph NE
Humidity83%
Visibility6.2 mi
Dew point69°
Thu, 1372° / 67°0.34Rain
72 °Rain

Duncan, Thursday, 13 August

Rain. High 72°, low 67°.

Pressure29.91 inHg
Wind9.8 mph NE
Humidity94%
Visibility—
Dew point69°
Fri, 1475° / 55°0Clear
75 °Clear

Duncan, Friday, 14 August

Clear. High 75°, low 55°.

Pressure30.18 inHg
Wind7.6 mph NE
Humidity62%
Visibility—
Dew point57°
Sat, 1575° / 56°0Overcast
75 °Overcast

Duncan, Saturday, 15 August

Overcast. High 75°, low 56°.

Pressure30.30 inHg
Wind7.9 mph SE
Humidity60%
Visibility—
Dew point56°
Sun, 1680° / 57°0Overcast
80 °Overcast

Duncan, Sunday, 16 August

Overcast. High 80°, low 57°.

Pressure30.18 inHg
Wind10.9 mph SE
Humidity73%
Visibility—
Dew point60°
Mon, 1780° / 66°0.03Light rain
80 °Light rain

Duncan, Monday, 17 August

Light rain. High 80°, low 66°.

Pressure29.94 inHg
Wind7.6 mph SE
Humidity82%
Visibility—
Dew point71°
Tue, 1885° / 71°0.01Light rain
85 °Light rain

Duncan, Tuesday, 18 August

Light rain. High 85°, low 71°.

Pressure30.00 inHg
Wind7.3 mph NE
Humidity69%
Visibility—
Dew point70°
Wed, 1988° / 68°0.21Light rain
88 °Light rain

Duncan, Wednesday, 19 August

Light rain. High 88°, low 68°.

Pressure29.91 inHg
Wind8.1 mph S
Humidity65%
Visibility—
Dew point70°
Thu, 2080° / 67°0.35Rain
80 °Rain

Duncan, Thursday, 20 August

Rain. High 80°, low 67°.

Pressure29.91 inHg
Wind12 mph N
Humidity69%
Visibility—
Dew point67°
Fri, 2180° / 62°0Clear
80 °Clear

Duncan, Friday, 21 August

Clear. High 80°, low 62°.

Pressure29.97 inHg
Wind7.4 mph NE
Humidity60%
Visibility—
Dew point62°
Sat, 2280° / 60°0.01Light rain
80 °Light rain

Duncan, Saturday, 22 August

Light rain. High 80°, low 60°.

Pressure29.91 inHg
Wind18.2 mph NE
Humidity63%
Visibility—
Dew point64°
Sun, 2368° / 48°0Mostly clear
68 °Mostly clear

Duncan, Sunday, 23 August

Mostly clear. High 68°, low 48°.

Pressure30.21 inHg
Wind13.4 mph E
Humidity49%
Visibility—
Dew point44°

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.