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As of 10:12 MDT

Weather in Arpan, SD

65°Current weather

Arpan, Saturday, 17 October, 10:12

Clear. Feels like 62°. High 78°, low 46°.

Pressure30.09 inHg
Wind6.5 mph W
Humidity27%
Visibility6.2 mi
Dew point30°

Monthly outlook for Arpan, SD: average high 61.6°, average low 41.7°. That is 3° above the climate normal for October. Precipitation is expected on 2 days (about 2.0 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 17 October (77.8°), the coolest 1 November (21.1°).

61.6°/41.7°
Average high / low
+3°
Above normal
2 / 3
Wet days / normal
2.0 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
17 October – 26 October67.7°58.3°+5.2°
27 October – 5 November51.3°51.9°-0.4°
6 November – 15 Novemberat normal46.9°—

October records over 66 years

92.5°4 October 1963All-time high
-5.8°26 October 2020All-time low
Sun, 1868° / 47°0Clear
68 °Clear

Arpan, Sunday, 18 October

Clear. High 68°, low 47°.

Pressure30.09 inHg
Wind5.2 mph N
Humidity32%
Visibility6.2 mi
Dew point34°
Mon, 1961° / 43°0Clear
61 °Clear

Arpan, Monday, 19 October

Clear. High 61°, low 43°.

Pressure30.12 inHg
Wind14.9 mph SE
Humidity50%
Visibility6.2 mi
Dew point40°
Tue, 2070° / 45°0Clear
70 °Clear

Arpan, Tuesday, 20 October

Clear. High 70°, low 45°.

Pressure29.97 inHg
Wind4 mph E
Humidity53%
Visibility6.2 mi
Dew point45°
Wed, 2168° / 47°0Clear
68 °Clear

Arpan, Wednesday, 21 October

Clear. High 68°, low 47°.

Pressure30.15 inHg
Wind12.1 mph SE
Humidity58%
Visibility—
Dew point46°
Thu, 2278° / 51°0Overcast
78 °Overcast

Arpan, Thursday, 22 October

Overcast. High 78°, low 51°.

Pressure29.91 inHg
Wind15 mph SE
Humidity50%
Visibility—
Dew point49°
Fri, 2378° / 60°0Overcast
78 °Overcast

Arpan, Friday, 23 October

Overcast. High 78°, low 60°.

Pressure29.50 inHg
Wind27.3 mph SW
Humidity40%
Visibility—
Dew point48°
Sat, 2458° / 40°0.2Rain
58 °Rain

Arpan, Saturday, 24 October

Rain. High 58°, low 40°.

Pressure29.97 inHg
Wind30.3 mph NW
Humidity92%
Visibility—
Dew point39°
Sun, 2560° / 36°0Overcast
60 °Overcast

Arpan, Sunday, 25 October

Overcast. High 60°, low 36°.

Pressure30.00 inHg
Wind25 mph SE
Humidity43%
Visibility—
Dew point28°
Mon, 2659° / 46°0Overcast
59 °Overcast

Arpan, Monday, 26 October

Overcast. High 59°, low 46°.

Pressure29.68 inHg
Wind16.3 mph SE
Humidity36%
Visibility—
Dew point30°
Tue, 2771° / 44°0Overcast
71 °Overcast

Arpan, Tuesday, 27 October

Overcast. High 71°, low 44°.

Pressure29.50 inHg
Wind24.3 mph SW
Humidity23%
Visibility—
Dew point24°
Wed, 2854° / 42°0.03Light rain
54 °Light rain

Arpan, Wednesday, 28 October

Light rain. High 54°, low 42°.

Pressure29.94 inHg
Wind26.2 mph NW
Humidity23%
Visibility—
Dew point14°
Thu, 2966° / 41°0Clear
66 °Clear

Arpan, Thursday, 29 October

Clear. High 66°, low 41°.

Pressure29.59 inHg
Wind9.3 mph SE
Humidity18%
Visibility—
Dew point16°
Fri, 3048° / 32°1.78Snow
48 °Snow

Arpan, Friday, 30 October

Snow. High 48°, low 32°.

Pressure29.53 inHg
Wind27 mph NW
Humidity99%
Visibility—
Dew point36°
Sat, 3134° / 26°0.02Light snow
34 °Light snow

Arpan, Saturday, 31 October

Light snow. High 34°, low 26°.

Pressure29.88 inHg
Wind27.9 mph NW
Humidity100%
Visibility—
Dew point33°
Sun, 0135° / 21°0Clear
35 °Clear

Arpan, Sunday, 1 November

Clear. High 35°, low 21°.

Pressure30.00 inHg
Wind5.7 mph E
Humidity100%
Visibility—
Dew point33°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0251° / 32°0.02Climate normal
51 °Climate normal

Arpan, Monday, 2 November

Climate normal for this date — 60-year average.

Average high51°
Average low32°
Average precipitation0.02 in
Chance of precipitation20%
Record high75° (1965)
Record low-4° (1991)
Tue, 0350° / 33°0.03Climate normal
50 °Climate normal

Arpan, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high50°
Average low33°
Average precipitation0.03 in
Chance of precipitation17%
Record high72° (2020)
Record low-2° (1991)
Wed, 0452° / 31°0.01Climate normal
52 °Climate normal

Arpan, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high52°
Average low31°
Average precipitation0.01 in
Chance of precipitation12%
Record high78° (1978)
Record low6° (1991)
Thu, 0550° / 32°0.03Climate normal
50 °Climate normal

Arpan, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high50°
Average low32°
Average precipitation0.03 in
Chance of precipitation20%
Record high73° (2020)
Record low6° (2003)
Fri, 0650° / 30°0.04Climate normal
50 °Climate normal

Arpan, Friday, 6 November

Climate normal for this date — 60-year average.

Average high50°
Average low30°
Average precipitation0.04 in
Chance of precipitation12%
Record high72° (2009)
Record low1° (2003)
Sat, 0750° / 31°0.03Climate normal
50 °Climate normal

Arpan, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high50°
Average low31°
Average precipitation0.03 in
Chance of precipitation12%
Record high76° (1999)
Record low-4° (1991)
Sun, 0848° / 30°0.04Climate normal
48 °Climate normal

Arpan, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high48°
Average low30°
Average precipitation0.04 in
Chance of precipitation23%
Record high79° (1999)
Record low6° (2000)
Mon, 0945° / 28°0.06Climate normal
45 °Climate normal

Arpan, Monday, 9 November

Climate normal for this date — 60-year average.

Average high45°
Average low28°
Average precipitation0.06 in
Chance of precipitation22%
Record high71° (2001)
Record low2° (1966)
Tue, 1046° / 27°0.05Climate normal
46 °Climate normal

Arpan, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high46°
Average low27°
Average precipitation0.05 in
Chance of precipitation20%
Record high71° (2007)
Record low-9° (1986)
Wed, 1144° / 26°0.02Climate normal
44 °Climate normal

Arpan, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high44°
Average low26°
Average precipitation0.02 in
Chance of precipitation17%
Record high68° (2005)
Record low-9° (1986)
Thu, 1246° / 26°0.02Climate normal
46 °Climate normal

Arpan, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high46°
Average low26°
Average precipitation0.02 in
Chance of precipitation13%
Record high76° (1999)
Record low-9° (1986)
Fri, 1347° / 28°0.04Climate normal
47 °Climate normal

Arpan, Friday, 13 November

Climate normal for this date — 60-year average.

Average high47°
Average low28°
Average precipitation0.04 in
Chance of precipitation20%
Record high69° (1990)
Record low-15° (1986)
Sat, 1447° / 29°0.03Climate normal
47 °Climate normal

Arpan, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high47°
Average low29°
Average precipitation0.03 in
Chance of precipitation20%
Record high74° (2025)
Record low-4° (2014)
Sun, 1546° / 27°0.02Climate normal
46 °Climate normal

Arpan, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high46°
Average low27°
Average precipitation0.02 in
Chance of precipitation13%
Record high69° (2021)
Record low0° (1978)

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 Arpan, 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 Arpan, 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.