As of 05:14 CDT

Weather in Watertown, SD

64°

Watertown, Sunday, 9 August, 05:14

Heavy rain. Feels like 64°. High 82°, low 63°.

Pressure29.83 inHg

Wind5.1 mph S

Humidity93%

Visibility6.2 mi

Dew point62°

See detailed hourly forecast

Monthly outlook for Watertown, SD: average high 82.1°, average low 62.6°. That is 2.1° above the climate normal for August. Precipitation is expected on 11 days (about 3.3 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 19 August (96.7°), the coolest 14 August (57°).

82.1°/62.6°

Average high / low

+2.1°

Above normal

11 / 5

Wet days / normal

3.3 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	83°	78.4°	+2.6°
19 August – 28 August	80.5°	78°	+1.4°
29 August – 7 September	at normal	76.1°	—

August records over 66 years

97.3°13 August 1965All-time high

45°21 August 2004All-time low

Mon, 1088° / 58°

0.04

88 °

Watertown, Monday, 10 August

Rain. High 88°, low 58°.

Pressure29.85 inHg

Wind8.6 mph SE

Humidity26%

Visibility6.2 mi

Dew point50°

Tue, 1187° / 62°

1.4

87 °

Watertown, Tuesday, 11 August

Heavy rain. High 87°, low 62°.

Pressure29.85 inHg

Wind8.3 mph NE

Humidity53%

Visibility6.2 mi

Dew point60°

Wed, 1284° / 61°

84 °

Watertown, Wednesday, 12 August

Clear. High 84°, low 61°.

Pressure29.94 inHg

Wind9.1 mph E

Humidity33%

Visibility6.2 mi

Dew point48°

Thu, 1371° / 60°

71 °

Watertown, Thursday, 13 August

Overcast. High 71°, low 60°.

Pressure30.06 inHg

Wind13.5 mph E

Humidity45%

Visibility—

Dew point47°

Fri, 1480° / 57°

80 °

Watertown, Friday, 14 August

Overcast. High 80°, low 57°.

Pressure30.09 inHg

Wind14.1 mph SE

Humidity33%

Visibility—

Dew point44°

Sat, 1573° / 61°

73 °

Watertown, Saturday, 15 August

Light rain. High 73°, low 61°.

Pressure30.12 inHg

Wind10.5 mph S

Humidity83%

Visibility—

Dew point59°

Sun, 1686° / 62°

86 °

Watertown, Sunday, 16 August

Overcast. High 86°, low 62°.

Pressure30.12 inHg

Wind9.1 mph NE

Humidity38%

Visibility—

Dew point51°

Mon, 1783° / 63°

0.25

83 °

Watertown, Monday, 17 August

Rain. High 83°, low 63°.

Pressure30.00 inHg

Wind13.9 mph S

Humidity44%

Visibility—

Dew point56°

Tue, 1896° / 68°

0.59

96 °

Watertown, Tuesday, 18 August

Rain. High 96°, low 68°.

Pressure29.77 inHg

Wind15.9 mph S

Humidity48%

Visibility—

Dew point65°

Wed, 1997° / 68°

0.15

97 °

Watertown, Wednesday, 19 August

Rain. High 97°, low 68°.

Pressure29.77 inHg

Wind11.9 mph NE

Humidity48%

Visibility—

Dew point66°

Thu, 2076° / 64°

0.09

76 °

Watertown, Thursday, 20 August

Light rain. High 76°, low 64°.

Pressure30.00 inHg

Wind11 mph N

Humidity54%

Visibility—

Dew point53°

Fri, 2184° / 63°

0.07

84 °

Watertown, Friday, 21 August

Light rain. High 84°, low 63°.

Pressure29.91 inHg

Wind16.7 mph E

Humidity40%

Visibility—

Dew point54°

Sat, 2284° / 65°

0.41

84 °

Watertown, Saturday, 22 August

Rain. High 84°, low 65°.

Pressure29.74 inHg

Wind17.3 mph NE

Humidity61%

Visibility—

Dew point67°

Sun, 2369° / 64°

0.12

69 °

Watertown, Sunday, 23 August

Light rain. High 69°, low 64°.

Pressure29.97 inHg

Wind12.5 mph NE

Humidity92%

Visibility—

Dew point64°

Mon, 2474° / 62°

0.1

74 °

Watertown, Monday, 24 August

Light rain. High 74°, low 62°.

Pressure30.03 inHg

Wind10.7 mph E

Humidity90%

Visibility—

Dew point63°

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

Tue, 2578° / 62°

0.1

78 °

Watertown, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.1 in

Chance of precipitation33%

Record high91° (1974)

Record low47° (1968)

Wed, 2678° / 62°

0.11

78 °

Watertown, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.11 in

Chance of precipitation28%

Record high95° (1976)

Record low46° (1992)

Thu, 2778° / 61°

0.05

78 °

Watertown, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high78°

Average low61°

Average precipitation0.05 in

Chance of precipitation22%

Record high93° (1973)

Record low47° (1986)

Fri, 2878° / 62°

0.08

78 °

Watertown, Friday, 28 August

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.08 in

Chance of precipitation25%

Record high93° (1984)

Record low45° (1965)

Sat, 2978° / 61°

0.08

78 °

Watertown, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high78°

Average low61°

Average precipitation0.08 in

Chance of precipitation25%

Record high95° (2012)

Record low50° (1988)

Sun, 3077° / 60°

0.07

77 °

Watertown, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high77°

Average low60°

Average precipitation0.07 in

Chance of precipitation17%

Record high91° (1976)

Record low47° (2009)

Mon, 3177° / 60°

0.08

77 °

Watertown, Monday, 31 August

Climate normal for this date — 60-year average.

Average high77°

Average low60°

Average precipitation0.08 in

Chance of precipitation28%

Record high89° (2013)

Record low46° (1992)

Tue, 0176° / 60°

0.08

76 °

Watertown, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high76°

Average low60°

Average precipitation0.08 in

Chance of precipitation23%

Record high90° (1983)

Record low45° (1965)

Wed, 0276° / 60°

0.13

76 °

Watertown, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high76°

Average low60°

Average precipitation0.13 in

Chance of precipitation30%

Record high94° (1983)

Record low46° (1974)

Thu, 0376° / 60°

0.05

76 °

Watertown, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high76°

Average low60°

Average precipitation0.05 in

Chance of precipitation22%

Record high93° (2023)

Record low42° (1974)

Fri, 0476° / 59°

0.1

76 °

Watertown, Friday, 4 September

Climate normal for this date — 60-year average.

Average high76°

Average low59°

Average precipitation0.1 in

Chance of precipitation22%

Record high93° (2023)

Record low44° (2025)

Sat, 0575° / 59°

0.09

75 °

Watertown, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high75°

Average low59°

Average precipitation0.09 in

Chance of precipitation22%

Record high90° (1978)

Record low40° (1965)

Sun, 0676° / 58°

0.06

76 °

Watertown, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high76°

Average low58°

Average precipitation0.06 in

Chance of precipitation22%

Record high95° (1976)

Record low45° (2025)

Mon, 0774° / 57°

0.1

74 °

Watertown, Monday, 7 September

Climate normal for this date — 60-year average.

Average high74°

Average low57°

Average precipitation0.1 in

Chance of precipitation28%

Record high91° (1978)

Record low42° (2025)

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 Watertown, SD 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 Watertown, SD 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.