As of 00:49 MDT

Weather in St. Onge, SD

74°

St. Onge, Sunday, 9 August, 00:49

Clear. Feels like 73°. High 89°, low 64°.

Pressure29.88 inHg

Wind5 mph E

Humidity30%

Visibility6.2 mi

Dew point41°

See detailed hourly forecast

Monthly outlook for St. Onge, SD: average high 86.9°, average low 65.1°. That is 2.9° above the climate normal for August. Precipitation is expected on 8 days (about 1.5 inches), against a normal of 5 days and 0.9 inches. The warmest day looks like 17 August (96.3°), the coolest 14 August (60°).

86.9°/65.1°

Average high / low

+2.9°

Above normal

8 / 5

Wet days / normal

1.5 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	87.2°	81.4°	+3.2°
19 August – 28 August	86.2°	81.4°	+2.7°
29 August – 7 September	at normal	79.1°	—

August records over 66 years

101.1°6 August 1961All-time high

38.3°23 August 1966All-time low

Climate normals and records are computed from the nearest reference point — Whitewood (7 mi).

Mon, 1094° / 65°

94 °

St. Onge, Monday, 10 August

Clear. High 94°, low 65°.

Pressure29.71 inHg

Wind9.7 mph NE

Humidity20%

Visibility6.2 mi

Dew point46°

Tue, 1192° / 61°

0.05

92 °

St. Onge, Tuesday, 11 August

Light rain. High 92°, low 61°.

Pressure29.83 inHg

Wind14.3 mph E

Humidity37%

Visibility6.2 mi

Dew point56°

Wed, 1292° / 67°

0.07

92 °

St. Onge, Wednesday, 12 August

Light rain. High 92°, low 67°.

Pressure29.77 inHg

Wind10 mph NE

Humidity25%

Visibility6.2 mi

Dew point51°

Thu, 1370° / 63°

0.1

70 °

St. Onge, Thursday, 13 August

Light rain. High 70°, low 63°.

Pressure29.94 inHg

Wind21.5 mph SE

Humidity65%

Visibility—

Dew point57°

Fri, 1476° / 60°

0.15

76 °

St. Onge, Friday, 14 August

Light rain. High 76°, low 60°.

Pressure29.88 inHg

Wind10.6 mph E

Humidity59%

Visibility—

Dew point58°

Sat, 1577° / 63°

0.22

77 °

St. Onge, Saturday, 15 August

Light rain. High 77°, low 63°.

Pressure30.12 inHg

Wind11.2 mph NW

Humidity52%

Visibility—

Dew point54°

Sun, 1690° / 64°

0.02

90 °

St. Onge, Sunday, 16 August

Light rain. High 90°, low 64°.

Pressure30.03 inHg

Wind20.6 mph SE

Humidity37%

Visibility—

Dew point54°

Mon, 1796° / 68°

96 °

St. Onge, Monday, 17 August

Mostly clear. High 96°, low 68°.

Pressure29.83 inHg

Wind12.4 mph NW

Humidity23%

Visibility—

Dew point46°

Tue, 1895° / 75°

95 °

St. Onge, Tuesday, 18 August

Overcast. High 95°, low 75°.

Pressure29.80 inHg

Wind13.8 mph E

Humidity23%

Visibility—

Dew point46°

Wed, 1991° / 71°

0.02

91 °

St. Onge, Wednesday, 19 August

Light rain. High 91°, low 71°.

Pressure29.83 inHg

Wind13.6 mph N

Humidity26%

Visibility—

Dew point48°

Thu, 2086° / 64°

0.07

86 °

St. Onge, Thursday, 20 August

Light rain. High 86°, low 64°.

Pressure29.88 inHg

Wind21.9 mph SE

Humidity31%

Visibility—

Dew point49°

Fri, 2189° / 66°

0.03

89 °

St. Onge, Friday, 21 August

Light rain. High 89°, low 66°.

Pressure29.77 inHg

Wind10.4 mph SE

Humidity35%

Visibility—

Dew point54°

Sat, 2289° / 65°

0.02

89 °

St. Onge, Saturday, 22 August

Light rain. High 89°, low 65°.

Pressure29.80 inHg

Wind11.9 mph E

Humidity43%

Visibility—

Dew point56°

Sun, 2381° / 64°

0.67

81 °

St. Onge, Sunday, 23 August

Heavy rain. High 81°, low 64°.

Pressure29.83 inHg

Wind16.4 mph E

Humidity52%

Visibility—

Dew point60°

Mon, 2481° / 62°

0.04

81 °

St. Onge, Monday, 24 August

Light rain. High 81°, low 62°.

Pressure29.94 inHg

Wind20.2 mph SE

Humidity57%

Visibility—

Dew point60°

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

Tue, 2581° / 59°

0.03

81 °

St. Onge, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high81°

Average low59°

Average precipitation0.03 in

Chance of precipitation25%

Record high94° (1991)

Record low41° (1964)

Wed, 2681° / 58°

0.07

81 °

St. Onge, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high81°

Average low58°

Average precipitation0.07 in

Chance of precipitation33%

Record high97° (1970)

Record low47° (1992)

Thu, 2781° / 59°

0.06

81 °

St. Onge, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high81°

Average low59°

Average precipitation0.06 in

Chance of precipitation18%

Record high97° (2010)

Record low46° (1987)

Fri, 2880° / 59°

0.02

80 °

St. Onge, Friday, 28 August

Climate normal for this date — 60-year average.

Average high80°

Average low59°

Average precipitation0.02 in

Chance of precipitation13%

Record high94° (2012)

Record low46° (1987)

Sat, 2980° / 58°

0.04

80 °

St. Onge, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high80°

Average low58°

Average precipitation0.04 in

Chance of precipitation20%

Record high100° (2012)

Record low47° (1988)

Sun, 3082° / 59°

0.04

82 °

St. Onge, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high82°

Average low59°

Average precipitation0.04 in

Chance of precipitation28%

Record high97° (1990)

Record low44° (1992)

Mon, 3179° / 58°

0.05

79 °

St. Onge, Monday, 31 August

Climate normal for this date — 60-year average.

Average high79°

Average low58°

Average precipitation0.05 in

Chance of precipitation22%

Record high95° (1975)

Record low42° (1993)

Tue, 0179° / 57°

0.05

79 °

St. Onge, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high79°

Average low57°

Average precipitation0.05 in

Chance of precipitation22%

Record high96° (2012)

Record low44° (1974)

Wed, 0280° / 58°

0.05

80 °

St. Onge, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high80°

Average low58°

Average precipitation0.05 in

Chance of precipitation23%

Record high99° (2024)

Record low40° (1974)

Thu, 0379° / 57°

0.03

79 °

St. Onge, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high79°

Average low57°

Average precipitation0.03 in

Chance of precipitation20%

Record high94° (2007)

Record low38° (1974)

Fri, 0479° / 57°

0.08

79 °

St. Onge, Friday, 4 September

Climate normal for this date — 60-year average.

Average high79°

Average low57°

Average precipitation0.08 in

Chance of precipitation20%

Record high100° (1960)

Record low39° (1962)

Sat, 0579° / 57°

0.08

79 °

St. Onge, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high79°

Average low57°

Average precipitation0.08 in

Chance of precipitation22%

Record high97° (1978)

Record low38° (1965)

Sun, 0678° / 55°

0.05

78 °

St. Onge, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high78°

Average low55°

Average precipitation0.05 in

Chance of precipitation27%

Record high97° (1978)

Record low40° (2025)

Mon, 0777° / 55°

0.05

77 °

St. Onge, Monday, 7 September

Climate normal for this date — 60-year average.

Average high77°

Average low55°

Average precipitation0.05 in

Chance of precipitation25%

Record high96° (2022)

Record low39° (2020)

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 St. Onge, 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 St. Onge, 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.