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As of 13:13 MDT

Weather in Arpan, SD

52°Current weather

Arpan, Thursday, 15 October, 13:13

Clear. Feels like 49°. High 52°, low 41°.

Pressure30.42 inHg
Wind27 mph NW
Humidity46%
Visibility6.2 mi
Dew point31°

Monthly outlook for Arpan, SD: average high 61.6°, average low 43.5°. That is 2.5° above the climate normal for October. Precipitation is expected on 3 days (about 0.8 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 22 October (80.4°), the coolest 16 October (31.1°).

61.6°/43.5°
Average high / low
+2.5°
Above normal
3 / 3
Wet days / normal
0.8 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
15 October – 24 October66.1°58.5°+4.2°
25 October – 3 November54°53.1°+0.5°
4 November – 13 Novemberat normal47.8°—

October records over 66 years

92.5°4 October 1963All-time high
-5.8°26 October 2020All-time low
Fri, 1655° / 31°0Clear
55 °Clear

Arpan, Friday, 16 October

Clear. High 55°, low 31°.

Pressure30.65 inHg
Wind5.9 mph S
Humidity45%
Visibility6.2 mi
Dew point22°
Sat, 1775° / 38°0Clear
75 °Clear

Arpan, Saturday, 17 October

Clear. High 75°, low 38°.

Pressure30.03 inHg
Wind2.4 mph S
Humidity24%
Visibility6.2 mi
Dew point26°
Sun, 1868° / 47°0Clear
68 °Clear

Arpan, Sunday, 18 October

Clear. High 68°, low 47°.

Pressure30.06 inHg
Wind3.2 mph N
Humidity34%
Visibility6.2 mi
Dew point35°
Mon, 1964° / 43°0Clear
64 °Clear

Arpan, Monday, 19 October

Clear. High 64°, low 43°.

Pressure30.03 inHg
Wind12.8 mph SE
Humidity46%
Visibility6.2 mi
Dew point39°
Tue, 2074° / 45°0Clear
74 °Clear

Arpan, Tuesday, 20 October

Clear. High 74°, low 45°.

Pressure29.97 inHg
Wind12.2 mph SE
Humidity50%
Visibility—
Dew point42°
Wed, 2180° / 51°0Mostly clear
80 °Mostly clear

Arpan, Wednesday, 21 October

Mostly clear. High 80°, low 51°.

Pressure29.77 inHg
Wind10.1 mph E
Humidity37%
Visibility—
Dew point41°
Thu, 2280° / 57°0Overcast
80 °Overcast

Arpan, Thursday, 22 October

Overcast. High 80°, low 57°.

Pressure29.68 inHg
Wind9.7 mph NW
Humidity33%
Visibility—
Dew point41°
Fri, 2359° / 51°0.29Rain
59 °Rain

Arpan, Friday, 23 October

Rain. High 59°, low 51°.

Pressure29.91 inHg
Wind14.5 mph NW
Humidity72%
Visibility—
Dew point43°
Sat, 2455° / 44°0Clear
55 °Clear

Arpan, Saturday, 24 October

Clear. High 55°, low 44°.

Pressure30.24 inHg
Wind18 mph W
Humidity29%
Visibility—
Dew point20°
Sun, 2563° / 39°0Overcast
63 °Overcast

Arpan, Sunday, 25 October

Overcast. High 63°, low 39°.

Pressure30.15 inHg
Wind23.6 mph SE
Humidity53%
Visibility—
Dew point33°
Mon, 2656° / 44°0Overcast
56 °Overcast

Arpan, Monday, 26 October

Overcast. High 56°, low 44°.

Pressure30.00 inHg
Wind16.6 mph NW
Humidity54%
Visibility—
Dew point35°
Tue, 2750° / 43°0.39Rain
50 °Rain

Arpan, Tuesday, 27 October

Rain. High 50°, low 43°.

Pressure29.85 inHg
Wind10.6 mph E
Humidity71%
Visibility—
Dew point38°
Wed, 2855° / 42°0Clear
55 °Clear

Arpan, Wednesday, 28 October

Clear. High 55°, low 42°.

Pressure29.59 inHg
Wind18 mph NW
Humidity29%
Visibility—
Dew point20°
Thu, 2954° / 43°0Clear
54 °Clear

Arpan, Thursday, 29 October

Clear. High 54°, low 43°.

Pressure29.80 inHg
Wind15.8 mph W
Humidity39%
Visibility—
Dew point26°
Fri, 3047° / 38°0.08Snow
47 °Snow

Arpan, Friday, 30 October

Snow. High 47°, low 38°.

Pressure30.09 inHg
Wind21.6 mph NW
Humidity46%
Visibility—
Dew point25°
From day 17 onward the outlook is built from 60-year climate statistics
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)
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)

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.