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As of 12:56 MDT

Weather in Arpan, SD

49°Current weather

Arpan, Monday, 12 October, 12:56

Overcast. Feels like 43°. High 50°, low 43°.

Pressure29.91 inHg
Wind15.4 mph NW
Humidity75%
Visibility6.2 mi
Dew point42°

Monthly outlook for Arpan, SD: average high 62.5°, average low 44.4°. That is 2.4° above the climate normal for October. Precipitation is expected on 2 days (about 1.3 inches), against a normal of 3 days and 0.6 inches. The warmest day looks like 20 October (80.2°), the coolest 16 October (32.3°).

62.5°/44.4°
Average high / low
+2.4°
Above normal
2 / 3
Wet days / normal
1.3 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
12 October – 21 October64.7°59.2°+3°
22 October – 31 October58.9°55°+2.2°
1 November – 10 Novemberat normal49.4°—

October records over 66 years

92.5°4 October 1963All-time high
-5.8°26 October 2020All-time low
Tue, 1348° / 37°0.01Light rain
48 °Light rain

Arpan, Tuesday, 13 October

Light rain. High 48°, low 37°.

Pressure30.09 inHg
Wind2.3 mph SE
Humidity68%
Visibility6.2 mi
Dew point37°
Wed, 1456° / 39°0Overcast
56 °Overcast

Arpan, Wednesday, 14 October

Overcast. High 56°, low 39°.

Pressure30.18 inHg
Wind4.5 mph SE
Humidity52%
Visibility6.2 mi
Dew point38°
Thu, 1557° / 44°0Overcast
57 °Overcast

Arpan, Thursday, 15 October

Overcast. High 57°, low 44°.

Pressure30.50 inHg
Wind17 mph NW
Humidity37%
Visibility6.2 mi
Dew point23°
Fri, 1660° / 32°0Clear
60 °Clear

Arpan, Friday, 16 October

Clear. High 60°, low 32°.

Pressure30.59 inHg
Wind11.2 mph SE
Humidity41%
Visibility6.2 mi
Dew point22°
Sat, 1776° / 39°0Clear
76 °Clear

Arpan, Saturday, 17 October

Clear. High 76°, low 39°.

Pressure29.91 inHg
Wind7.3 mph SW
Humidity23%
Visibility—
Dew point27°
Sun, 1875° / 49°0Clear
75 °Clear

Arpan, Sunday, 18 October

Clear. High 75°, low 49°.

Pressure29.80 inHg
Wind7.9 mph N
Humidity20%
Visibility—
Dew point26°
Mon, 1971° / 48°0Clear
71 °Clear

Arpan, Monday, 19 October

Clear. High 71°, low 48°.

Pressure30.03 inHg
Wind24.4 mph SE
Humidity27%
Visibility—
Dew point29°
Tue, 2080° / 52°0Mostly clear
80 °Mostly clear

Arpan, Tuesday, 20 October

Mostly clear. High 80°, low 52°.

Pressure29.68 inHg
Wind20.1 mph SE
Humidity22%
Visibility—
Dew point32°
Wed, 2174° / 55°0Overcast
74 °Overcast

Arpan, Wednesday, 21 October

Overcast. High 74°, low 55°.

Pressure29.68 inHg
Wind14.1 mph N
Humidity33%
Visibility—
Dew point39°
Thu, 2259° / 46°0Overcast
59 °Overcast

Arpan, Thursday, 22 October

Overcast. High 59°, low 46°.

Pressure30.12 inHg
Wind15.2 mph NW
Humidity57%
Visibility—
Dew point38°
Fri, 2355° / 49°0.65Heavy rain
55 °Heavy rain

Arpan, Friday, 23 October

Heavy rain. High 55°, low 49°.

Pressure29.88 inHg
Wind19.8 mph SW
Humidity93%
Visibility—
Dew point48°
Sat, 2450° / 43°0.59Rain
50 °Rain

Arpan, Saturday, 24 October

Rain. High 50°, low 43°.

Pressure29.77 inHg
Wind41.6 mph NW
Humidity87%
Visibility—
Dew point40°
Sun, 2559° / 40°0Clear
59 °Clear

Arpan, Sunday, 25 October

Clear. High 59°, low 40°.

Pressure30.47 inHg
Wind17.6 mph NW
Humidity45%
Visibility—
Dew point32°
Mon, 2668° / 45°0Clear
68 °Clear

Arpan, Monday, 26 October

Clear. High 68°, low 45°.

Pressure30.27 inHg
Wind15.9 mph W
Humidity28%
Visibility—
Dew point28°
Tue, 2763° / 50°0Mostly clear
63 °Mostly clear

Arpan, Tuesday, 27 October

Mostly clear. High 63°, low 50°.

Pressure30.30 inHg
Wind9.2 mph W
Humidity47%
Visibility—
Dew point39°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2855° / 35°0.05Climate normal
55 °Climate normal

Arpan, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high55°
Average low35°
Average precipitation0.05 in
Chance of precipitation18%
Record high80° (1985)
Record low13° (1991)
Thu, 2953° / 34°0.1Climate normal
53 °Climate normal

Arpan, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high53°
Average low34°
Average precipitation0.1 in
Chance of precipitation28%
Record high78° (1968)
Record low3° (1991)
Fri, 3051° / 33°0.03Climate normal
51 °Climate normal

Arpan, Friday, 30 October

Climate normal for this date — 60-year average.

Average high51°
Average low33°
Average precipitation0.03 in
Chance of precipitation20%
Record high78° (1968)
Record low-5° (1991)
Sat, 3151° / 33°0.04Climate normal
51 °Climate normal

Arpan, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high51°
Average low33°
Average precipitation0.04 in
Chance of precipitation17%
Record high77° (1999)
Record low-2° (1991)
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)

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.