As of 01:17 CDT

Weather in Letcher, SD

54°

Letcher, Wednesday, 7 October, 01:17

Mostly clear. Feels like 52°. High 78°, low 47°.

Pressure29.91 inHg

Wind6.9 mph NW

Humidity76%

Visibility6.2 mi

Dew point47°

See detailed hourly forecast

Monthly outlook for Letcher, SD: average high 66.5°, average low 49°. That is 3.1° above the climate normal for October. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 3 days and 1.1 inches. The warmest day looks like 10 October (84.7°), the coolest 17 October (37.1°).

66.5°/49°

Average high / low

+3.1°

Above normal

2 / 3

Wet days / normal

0.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
7 October – 16 October	68.4°	62.1°	+3.5°
17 October – 26 October	63.2°	58.1°	+2.8°
27 October – 5 November	at normal	52.1°	—

October records over 66 years

90.9°3 October 2025All-time high

11.5°31 October 2002All-time low

Thu, 0871° / 47°

71 °

Letcher, Thursday, 8 October

Overcast. High 71°, low 47°.

Pressure30.12 inHg

Wind6.5 mph SE

Humidity45%

Visibility6.2 mi

Dew point42°

Fri, 0982° / 57°

82 °

Letcher, Friday, 9 October

Partly cloudy. High 82°, low 57°.

Pressure29.80 inHg

Wind9.4 mph SE

Humidity66%

Visibility6.2 mi

Dew point60°

Sat, 1085° / 70°

85 °

Letcher, Saturday, 10 October

Clear. High 85°, low 70°.

Pressure29.56 inHg

Wind17 mph S

Humidity39%

Visibility6.2 mi

Dew point52°

Sun, 1172° / 58°

72 °

Letcher, Sunday, 11 October

Overcast. High 72°, low 58°.

Pressure29.68 inHg

Wind18.3 mph N

Humidity59%

Visibility—

Dew point56°

Mon, 1256° / 47°

56 °

Letcher, Monday, 12 October

Overcast. High 56°, low 47°.

Pressure30.09 inHg

Wind15.7 mph N

Humidity65%

Visibility—

Dew point38°

Tue, 1366° / 43°

66 °

Letcher, Tuesday, 13 October

Overcast. High 66°, low 43°.

Pressure29.97 inHg

Wind9.1 mph SE

Humidity53%

Visibility—

Dew point42°

Wed, 1466° / 56°

0.27

66 °

Letcher, Wednesday, 14 October

Rain. High 66°, low 56°.

Pressure29.62 inHg

Wind10.3 mph SE

Humidity88%

Visibility—

Dew point61°

Thu, 1555° / 48°

0.12

55 °

Letcher, Thursday, 15 October

Rain. High 55°, low 48°.

Pressure30.03 inHg

Wind26.1 mph NW

Humidity40%

Visibility—

Dew point29°

Fri, 1653° / 43°

53 °

Letcher, Friday, 16 October

Clear. High 53°, low 43°.

Pressure30.12 inHg

Wind24.7 mph NW

Humidity25%

Visibility—

Dew point15°

Sat, 1753° / 37°

53 °

Letcher, Saturday, 17 October

Clear. High 53°, low 37°.

Pressure30.36 inHg

Wind15.6 mph NW

Humidity43%

Visibility—

Dew point25°

Sun, 1865° / 40°

65 °

Letcher, Sunday, 18 October

Overcast. High 65°, low 40°.

Pressure29.91 inHg

Wind12.5 mph NW

Humidity25%

Visibility—

Dew point22°

Mon, 1963° / 45°

63 °

Letcher, Monday, 19 October

Overcast. High 63°, low 45°.

Pressure30.03 inHg

Wind10.9 mph E

Humidity37%

Visibility—

Dew point31°

Tue, 2065° / 46°

65 °

Letcher, Tuesday, 20 October

Overcast. High 65°, low 46°.

Pressure30.15 inHg

Wind9.8 mph SE

Humidity45%

Visibility—

Dew point38°

Wed, 2172° / 47°

72 °

Letcher, Wednesday, 21 October

Partly cloudy. High 72°, low 47°.

Pressure30.06 inHg

Wind15.8 mph NW

Humidity40%

Visibility—

Dew point40°

Thu, 2261° / 52°

61 °

Letcher, Thursday, 22 October

Clear. High 61°, low 52°.

Pressure30.30 inHg

Wind19.5 mph NW

Humidity29%

Visibility—

Dew point28°

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

Fri, 2357° / 39°

0.08

57 °

Letcher, Friday, 23 October

Climate normal for this date — 60-year average.

Average high57°

Average low39°

Average precipitation0.08 in

Chance of precipitation17%

Record high82° (2022)

Record low21° (1981)

Sat, 2456° / 39°

0.04

56 °

Letcher, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high56°

Average low39°

Average precipitation0.04 in

Chance of precipitation17%

Record high81° (1989)

Record low21° (2020)

Sun, 2556° / 39°

0.04

56 °

Letcher, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high56°

Average low39°

Average precipitation0.04 in

Chance of precipitation17%

Record high80° (1989)

Record low21° (2020)

Mon, 2657° / 38°

0.02

57 °

Letcher, Monday, 26 October

Climate normal for this date — 60-year average.

Average high57°

Average low38°

Average precipitation0.02 in

Chance of precipitation12%

Record high78° (1989)

Record low13° (2020)

Tue, 2755° / 38°

0.06

55 °

Letcher, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high55°

Average low38°

Average precipitation0.06 in

Chance of precipitation25%

Record high74° (1999)

Record low12° (2020)

Wed, 2854° / 37°

0.04

54 °

Letcher, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high54°

Average low37°

Average precipitation0.04 in

Chance of precipitation12%

Record high76° (2016)

Record low17° (2017)

Thu, 2953° / 37°

0.07

53 °

Letcher, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high53°

Average low37°

Average precipitation0.07 in

Chance of precipitation20%

Record high71° (1978)

Record low19° (1991)

Fri, 3052° / 37°

0.1

52 °

Letcher, Friday, 30 October

Climate normal for this date — 60-year average.

Average high52°

Average low37°

Average precipitation0.1 in

Chance of precipitation27%

Record high73° (1965)

Record low16° (1991)

Sat, 3153° / 35°

0.05

53 °

Letcher, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high53°

Average low35°

Average precipitation0.05 in

Chance of precipitation15%

Record high77° (2016)

Record low11° (2002)

Sun, 0151° / 35°

0.04

51 °

Letcher, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high51°

Average low35°

Average precipitation0.04 in

Chance of precipitation22%

Record high73° (1990)

Record low14° (2002)

Mon, 0251° / 34°

0.04

51 °

Letcher, Monday, 2 November

Climate normal for this date — 60-year average.

Average high51°

Average low34°

Average precipitation0.04 in

Chance of precipitation8%

Record high74° (2022)

Record low11° (1991)

Tue, 0350° / 35°

0.03

50 °

Letcher, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high50°

Average low35°

Average precipitation0.03 in

Chance of precipitation13%

Record high75° (1978)

Record low8° (1991)

Wed, 0451° / 32°

0.01

51 °

Letcher, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high51°

Average low32°

Average precipitation0.01 in

Chance of precipitation8%

Record high72° (1978)

Record low-7° (1991)

Thu, 0551° / 33°

0.04

51 °

Letcher, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high51°

Average low33°

Average precipitation0.04 in

Chance of precipitation20%

Record high74° (2001)

Record low13° (2003)

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 Letcher, 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 Letcher, 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.