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As of 15:06 MDT

Weather in Arpan, SD

59°Current weather

Arpan, Friday, 16 October, 15:06

Clear. Feels like 56°. High 59°, low 32°.

Pressure30.50 inHg
Wind10.6 mph SE
Humidity31%
Visibility6.2 mi
Dew point30°

Monthly outlook for Arpan, SD: average high 61.7°, average low 42.3°. That is 2.8° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 17 October (73.2°), the coolest 26 October (31°).

61.7°/42.3°
Average high / low
+2.8°
Above normal
2 / 3
Wet days / normal
0.2 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
16 October – 25 October62.6°58.5°+2.3°
26 October – 4 November60.1°52.6°+4.2°
5 November – 14 Novemberat normal47.3°—

October records over 66 years

92.5°4 October 1963All-time high
-5.8°26 October 2020All-time low
Sat, 1773° / 42°0Partly cloudy
73 °Partly cloudy

Arpan, Saturday, 17 October

Partly cloudy. High 73°, low 42°.

Pressure30.00 inHg
Wind2.7 mph S
Humidity24%
Visibility6.2 mi
Dew point30°
Sun, 1868° / 46°0Clear
68 °Clear

Arpan, Sunday, 18 October

Clear. High 68°, low 46°.

Pressure30.12 inHg
Wind6.2 mph N
Humidity34%
Visibility6.2 mi
Dew point35°
Mon, 1962° / 43°0Clear
62 °Clear

Arpan, Monday, 19 October

Clear. High 62°, low 43°.

Pressure30.06 inHg
Wind14.9 mph SE
Humidity51%
Visibility6.2 mi
Dew point41°
Tue, 2070° / 46°0Clear
70 °Clear

Arpan, Tuesday, 20 October

Clear. High 70°, low 46°.

Pressure29.91 inHg
Wind5.7 mph E
Humidity51%
Visibility6.2 mi
Dew point44°
Wed, 2166° / 47°0Clear
66 °Clear

Arpan, Wednesday, 21 October

Clear. High 66°, low 47°.

Pressure30.18 inHg
Wind12.7 mph SE
Humidity61%
Visibility—
Dew point45°
Thu, 2270° / 52°0.08Light rain
70 °Light rain

Arpan, Thursday, 22 October

Light rain. High 70°, low 52°.

Pressure29.85 inHg
Wind21.4 mph SE
Humidity50%
Visibility—
Dew point45°
Fri, 2367° / 45°0.11Light rain
67 °Light rain

Arpan, Friday, 23 October

Light rain. High 67°, low 45°.

Pressure29.50 inHg
Wind26.4 mph W
Humidity34%
Visibility—
Dew point37°
Sat, 2445° / 40°0Overcast
45 °Overcast

Arpan, Saturday, 24 October

Overcast. High 45°, low 40°.

Pressure30.27 inHg
Wind26.9 mph W
Humidity70%
Visibility—
Dew point33°
Sun, 2546° / 36°0Overcast
46 °Overcast

Arpan, Sunday, 25 October

Overcast. High 46°, low 36°.

Pressure30.39 inHg
Wind14.3 mph W
Humidity56%
Visibility—
Dew point28°
Mon, 2655° / 31°0Clear
55 °Clear

Arpan, Monday, 26 October

Clear. High 55°, low 31°.

Pressure30.30 inHg
Wind9 mph E
Humidity38%
Visibility—
Dew point22°
Tue, 2761° / 38°0Overcast
61 °Overcast

Arpan, Tuesday, 27 October

Overcast. High 61°, low 38°.

Pressure29.80 inHg
Wind26.1 mph SE
Humidity50%
Visibility—
Dew point37°
Wed, 2863° / 50°0Clear
63 °Clear

Arpan, Wednesday, 28 October

Clear. High 63°, low 50°.

Pressure29.50 inHg
Wind28.9 mph SW
Humidity19%
Visibility—
Dew point18°
Thu, 2955° / 44°0Overcast
55 °Overcast

Arpan, Thursday, 29 October

Overcast. High 55°, low 44°.

Pressure29.94 inHg
Wind33.1 mph W
Humidity53%
Visibility—
Dew point33°
Fri, 3061° / 41°0Overcast
61 °Overcast

Arpan, Friday, 30 October

Overcast. High 61°, low 41°.

Pressure30.00 inHg
Wind9 mph E
Humidity32%
Visibility—
Dew point24°
Sat, 3165° / 45°0Clear
65 °Clear

Arpan, Saturday, 31 October

Clear. High 65°, low 45°.

Pressure29.65 inHg
Wind14.6 mph NW
Humidity26%
Visibility—
Dew point23°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0151° / 33°0.06Climate normal
51 °Climate normal

Arpan, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high51°
Average low33°
Average precipitation0.06 in
Chance of precipitation17%
Record high74° (1965)
Record low0° (2002)
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)

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.