As of 00:12 CDT

Weather in Chelsea, SD

67°

Chelsea, Sunday, 9 August, 00:12

Partly cloudy. Feels like 67°. High 88°, low 55°.

Pressure29.80 inHg

Wind8.2 mph SE

Humidity78%

Visibility6.2 mi

Dew point59°

See detailed hourly forecast

Monthly outlook for Chelsea, SD: average high 88°, average low 61.1°. That is 3.4° above the climate normal for August. Precipitation is expected on 3 days (about 0.7 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 10 August (99°), the coolest 9 August (55.5°).

88°/61.1°

Average high / low

+3.4°

Above normal

3 / 4

Wet days / normal

0.7 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	89.4°	81.9°	+4.2°
19 August – 28 August	85.5°	81.6°	+2.2°
29 August – 7 September	at normal	79.6°	—

August records over 66 years

105.6°13 August 1965All-time high

44.8°29 August 1988All-time low

Climate normals and records are computed from the nearest reference point — Cresbard (10 mi).

Mon, 1099° / 56°

0.29

99 °

Chelsea, Monday, 10 August

Rain. High 99°, low 56°.

Pressure29.83 inHg

Wind6 mph E

Humidity26%

Visibility6.2 mi

Dew point49°

Tue, 1189° / 63°

0.07

89 °

Chelsea, Tuesday, 11 August

Rain. High 89°, low 63°.

Pressure29.88 inHg

Wind10.5 mph NE

Humidity52%

Visibility6.2 mi

Dew point61°

Wed, 1292° / 64°

92 °

Chelsea, Wednesday, 12 August

Partly cloudy. High 92°, low 64°.

Pressure29.94 inHg

Wind9.2 mph E

Humidity31%

Visibility6.2 mi

Dew point48°

Thu, 1382° / 65°

82 °

Chelsea, Thursday, 13 August

Overcast. High 82°, low 65°.

Pressure29.97 inHg

Wind9.4 mph E

Humidity41%

Visibility—

Dew point54°

Fri, 1487° / 61°

87 °

Chelsea, Friday, 14 August

Overcast. High 87°, low 61°.

Pressure30.06 inHg

Wind14.1 mph S

Humidity34%

Visibility—

Dew point49°

Sat, 1580° / 65°

0.02

80 °

Chelsea, Saturday, 15 August

Light rain. High 80°, low 65°.

Pressure30.12 inHg

Wind9.1 mph S

Humidity78%

Visibility—

Dew point60°

Sun, 1686° / 64°

0.04

86 °

Chelsea, Sunday, 16 August

Light rain. High 86°, low 64°.

Pressure30.06 inHg

Wind15.3 mph N

Humidity41%

Visibility—

Dew point55°

Mon, 1796° / 61°

96 °

Chelsea, Monday, 17 August

Overcast. High 96°, low 61°.

Pressure29.94 inHg

Wind10.8 mph SW

Humidity44%

Visibility—

Dew point59°

Tue, 1895° / 67°

95 °

Chelsea, Tuesday, 18 August

Partly cloudy. High 95°, low 67°.

Pressure29.91 inHg

Wind22.3 mph N

Humidity22%

Visibility—

Dew point44°

Wed, 1982° / 61°

0.01

82 °

Chelsea, Wednesday, 19 August

Light rain. High 82°, low 61°.

Pressure30.15 inHg

Wind10.4 mph NE

Humidity33%

Visibility—

Dew point43°

Thu, 2081° / 60°

0.03

81 °

Chelsea, Thursday, 20 August

Light rain. High 81°, low 60°.

Pressure30.06 inHg

Wind14.6 mph S

Humidity39%

Visibility—

Dew point47°

Fri, 2188° / 57°

0.17

88 °

Chelsea, Friday, 21 August

Rain. High 88°, low 57°.

Pressure29.80 inHg

Wind21.9 mph S

Humidity33%

Visibility—

Dew point48°

Sat, 2286° / 62°

86 °

Chelsea, Saturday, 22 August

Clear. High 86°, low 62°.

Pressure29.77 inHg

Wind20.9 mph NW

Humidity38%

Visibility—

Dew point53°

Sun, 2385° / 57°

85 °

Chelsea, Sunday, 23 August

Partly cloudy. High 85°, low 57°.

Pressure29.97 inHg

Wind7.7 mph SE

Humidity29%

Visibility—

Dew point43°

Mon, 2492° / 62°

92 °

Chelsea, Monday, 24 August

Partly cloudy. High 92°, low 62°.

Pressure29.68 inHg

Wind10.5 mph SE

Humidity31%

Visibility—

Dew point53°

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

Tue, 2582° / 63°

0.03

82 °

Chelsea, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high82°

Average low63°

Average precipitation0.03 in

Chance of precipitation17%

Record high98° (2020)

Record low48° (2025)

Wed, 2681° / 62°

0.12

81 °

Chelsea, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high81°

Average low62°

Average precipitation0.12 in

Chance of precipitation22%

Record high103° (1991)

Record low46° (1992)

Thu, 2781° / 61°

0.06

81 °

Chelsea, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high81°

Average low61°

Average precipitation0.06 in

Chance of precipitation28%

Record high100° (1973)

Record low45° (1992)

Fri, 2881° / 62°

0.15

81 °

Chelsea, Friday, 28 August

Climate normal for this date — 60-year average.

Average high81°

Average low62°

Average precipitation0.15 in

Chance of precipitation33%

Record high98° (1991)

Record low46° (1965)

Sat, 2982° / 62°

0.05

82 °

Chelsea, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high82°

Average low62°

Average precipitation0.05 in

Chance of precipitation22%

Record high98° (1961)

Record low45° (1988)

Sun, 3081° / 60°

0.09

81 °

Chelsea, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high81°

Average low60°

Average precipitation0.09 in

Chance of precipitation22%

Record high97° (1961)

Record low48° (2009)

Mon, 3180° / 61°

0.06

80 °

Chelsea, Monday, 31 August

Climate normal for this date — 60-year average.

Average high80°

Average low61°

Average precipitation0.06 in

Chance of precipitation23%

Record high94° (1979)

Record low45° (1992)

Tue, 0179° / 60°

0.09

79 °

Chelsea, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high79°

Average low60°

Average precipitation0.09 in

Chance of precipitation23%

Record high97° (1983)

Record low44° (1965)

Wed, 0279° / 60°

0.11

79 °

Chelsea, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high79°

Average low60°

Average precipitation0.11 in

Chance of precipitation27%

Record high101° (1983)

Record low47° (1974)

Thu, 0380° / 60°

0.05

80 °

Chelsea, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high80°

Average low60°

Average precipitation0.05 in

Chance of precipitation13%

Record high96° (1990)

Record low40° (1974)

Fri, 0480° / 60°

0.06

80 °

Chelsea, Friday, 4 September

Climate normal for this date — 60-year average.

Average high80°

Average low60°

Average precipitation0.06 in

Chance of precipitation18%

Record high98° (1979)

Record low44° (1962)

Sat, 0578° / 60°

0.07

78 °

Chelsea, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high78°

Average low60°

Average precipitation0.07 in

Chance of precipitation17%

Record high100° (1978)

Record low40° (1965)

Sun, 0679° / 58°

0.05

79 °

Chelsea, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high79°

Average low58°

Average precipitation0.05 in

Chance of precipitation18%

Record high102° (1976)

Record low43° (2025)

Mon, 0777° / 57°

0.1

77 °

Chelsea, Monday, 7 September

Climate normal for this date — 60-year average.

Average high77°

Average low57°

Average precipitation0.1 in

Chance of precipitation23%

Record high97° (1978)

Record low40° (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 Chelsea, 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 Chelsea, 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.