As of 21:05 EDT

Weather in Duncan, TN

77°

Duncan, Saturday, 8 August, 21:05

Mostly clear. Feels like 79°. High 85°, low 70°.

Pressure30.12 inHg

Wind3 mph S

Humidity88%

Visibility6.2 mi

Dew point73°

See detailed hourly forecast

Monthly outlook for Duncan, TN: average high 86.5°, average low 68.3°. That is 1° above the climate normal for August. Precipitation is expected on 12 days (about 5.0 inches), against a normal of 7 days and 1.9 inches. The warmest day looks like 12 August (92.8°), the coolest 21 August (61.1°).

86.5°/68.3°

Average high / low

+1°

Above normal

12 / 7

Wet days / normal

5.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 August – 17 August	86.7°	84.6°	+1.2°
18 August – 27 August	86.1°	84.7°	+0.8°
28 August – 6 September	at normal	83.6°	—

August records over 66 years

100.8°16 August 2007All-time high

53.8°7 August 2004All-time low

Climate normals and records are computed from the nearest reference point — Knoxville (12 mi).

Sun, 0986° / 70°

0.07

86 °

Duncan, Sunday, 9 August

Light rain. High 86°, low 70°.

Pressure30.12 inHg

Wind4.1 mph SW

Humidity57%

Visibility6.2 mi

Dew point69°

Mon, 1086° / 69°

0.31

86 °

Duncan, Monday, 10 August

Rain. High 86°, low 69°.

Pressure30.12 inHg

Wind6 mph SW

Humidity74%

Visibility5.4 mi

Dew point73°

Tue, 1190° / 69°

0.14

90 °

Duncan, Tuesday, 11 August

Rain. High 90°, low 69°.

Pressure30.06 inHg

Wind7.3 mph SW

Humidity67%

Visibility4.6 mi

Dew point72°

Wed, 1293° / 70°

0.67

93 °

Duncan, Wednesday, 12 August

Heavy rain. High 93°, low 70°.

Pressure29.97 inHg

Wind11.2 mph W

Humidity60%

Visibility6.2 mi

Dew point71°

Thu, 1387° / 68°

0.26

87 °

Duncan, Thursday, 13 August

Rain. High 87°, low 68°.

Pressure29.97 inHg

Wind6.6 mph W

Humidity60%

Visibility—

Dew point67°

Fri, 1483° / 70°

1.09

83 °

Duncan, Friday, 14 August

Rain. High 83°, low 70°.

Pressure30.09 inHg

Wind7.9 mph SW

Humidity80%

Visibility—

Dew point72°

Sat, 1581° / 71°

0.5

81 °

Duncan, Saturday, 15 August

Rain. High 81°, low 71°.

Pressure30.18 inHg

Wind4.8 mph NE

Humidity83%

Visibility—

Dew point71°

Sun, 1684° / 69°

0.23

84 °

Duncan, Sunday, 16 August

Rain. High 84°, low 69°.

Pressure30.12 inHg

Wind4 mph SW

Humidity92%

Visibility—

Dew point72°

Mon, 1793° / 70°

1.02

93 °

Duncan, Monday, 17 August

Heavy rain. High 93°, low 70°.

Pressure30.03 inHg

Wind8.6 mph NE

Humidity58%

Visibility—

Dew point70°

Tue, 1887° / 67°

0.43

87 °

Duncan, Tuesday, 18 August

Rain. High 87°, low 67°.

Pressure30.00 inHg

Wind7.9 mph N

Humidity60%

Visibility—

Dew point69°

Wed, 1989° / 68°

0.12

89 °

Duncan, Wednesday, 19 August

Light rain. High 89°, low 68°.

Pressure29.91 inHg

Wind5.4 mph W

Humidity55%

Visibility—

Dew point67°

Thu, 2085° / 66°

0.01

85 °

Duncan, Thursday, 20 August

Light rain. High 85°, low 66°.

Pressure29.88 inHg

Wind7.7 mph NE

Humidity75%

Visibility—

Dew point70°

Fri, 2182° / 61°

82 °

Duncan, Friday, 21 August

Overcast. High 82°, low 61°.

Pressure30.00 inHg

Wind5.8 mph NE

Humidity49%

Visibility—

Dew point57°

Sat, 2283° / 64°

0.13

83 °

Duncan, Saturday, 22 August

Light rain. High 83°, low 64°.

Pressure30.03 inHg

Wind4.9 mph W

Humidity72%

Visibility—

Dew point67°

Sun, 2391° / 69°

91 °

Duncan, Sunday, 23 August

Overcast. High 91°, low 69°.

Pressure30.06 inHg

Wind8.8 mph SW

Humidity57%

Visibility—

Dew point69°

From day 17 onward the outlook is built from 60-year climate statistics

Mon, 2485° / 67°

0.09

85 °

Duncan, Monday, 24 August

Climate normal for this date — 60-year average.

Average high85°

Average low67°

Average precipitation0.09 in

Chance of precipitation28%

Record high97° (2007)

Record low55° (1997)

Tue, 2585° / 67°

0.07

85 °

Duncan, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high85°

Average low67°

Average precipitation0.07 in

Chance of precipitation30%

Record high98° (2023)

Record low56° (2015)

Wed, 2685° / 67°

0.12

85 °

Duncan, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high85°

Average low67°

Average precipitation0.12 in

Chance of precipitation30%

Record high95° (2016)

Record low56° (1966)

Thu, 2785° / 67°

0.09

85 °

Duncan, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high85°

Average low67°

Average precipitation0.09 in

Chance of precipitation28%

Record high94° (2016)

Record low58° (2025)

Fri, 2885° / 67°

0.07

85 °

Duncan, Friday, 28 August

Climate normal for this date — 60-year average.

Average high85°

Average low67°

Average precipitation0.07 in

Chance of precipitation27%

Record high95° (1990)

Record low56° (1968)

Sat, 2985° / 67°

0.06

85 °

Duncan, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high85°

Average low67°

Average precipitation0.06 in

Chance of precipitation23%

Record high95° (2024)

Record low54° (1986)

Sun, 3084° / 67°

0.08

84 °

Duncan, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high84°

Average low67°

Average precipitation0.08 in

Chance of precipitation38%

Record high96° (2024)

Record low54° (1965)

Mon, 3184° / 67°

0.11

84 °

Duncan, Monday, 31 August

Climate normal for this date — 60-year average.

Average high84°

Average low67°

Average precipitation0.11 in

Chance of precipitation38%

Record high92° (2019)

Record low56° (1968)

Tue, 0183° / 67°

0.14

83 °

Duncan, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high83°

Average low67°

Average precipitation0.14 in

Chance of precipitation42%

Record high93° (1993)

Record low57° (1967)

Wed, 0284° / 66°

0.11

84 °

Duncan, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high84°

Average low66°

Average precipitation0.11 in

Chance of precipitation33%

Record high95° (2011)

Record low54° (1967)

Thu, 0383° / 66°

0.12

83 °

Duncan, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high83°

Average low66°

Average precipitation0.12 in

Chance of precipitation45%

Record high95° (2011)

Record low54° (1967)

Fri, 0483° / 65°

0.09

83 °

Duncan, Friday, 4 September

Climate normal for this date — 60-year average.

Average high83°

Average low65°

Average precipitation0.09 in

Chance of precipitation37%

Record high97° (2019)

Record low56° (1967)

Sat, 0582° / 65°

0.15

82 °

Duncan, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high82°

Average low65°

Average precipitation0.15 in

Chance of precipitation28%

Record high95° (1975)

Record low52° (1997)

Sun, 0682° / 65°

0.09

82 °

Duncan, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high82°

Average low65°

Average precipitation0.09 in

Chance of precipitation35%

Record high93° (1990)

Record low52° (1984)

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, TN 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, TN 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.