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As of 20:39 MDT

Weather in Arpan, SD

58°Current weather

Arpan, Saturday, 17 October, 20:39

Overcast. Feels like 55°. High 81°, low 45°.

Pressure29.91 inHg
Wind1.4 mph SW
Humidity43%
Visibility6.2 mi
Dew point35°

Monthly outlook for Arpan, SD: average high 65°, average low 43.7°. That is 4.9° above the climate normal for October. Precipitation is expected on 1 day (about 1.1 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 17 October (80.6°), the coolest 25 October (34.3°).

65°/43.7°
Average high / low
+4.9°
Above normal
1 / 3
Wet days / normal
1.1 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
17 October – 26 October66.5°58.3°+4.5°
27 October – 5 November62.5°51.9°+5.9°
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, 1870° / 49°0Clear
70 °Clear

Arpan, Sunday, 18 October

Clear. High 70°, low 49°.

Pressure30.09 inHg
Wind5.4 mph NE
Humidity34%
Visibility6.2 mi
Dew point35°
Mon, 1961° / 42°0Clear
61 °Clear

Arpan, Monday, 19 October

Clear. High 61°, low 42°.

Pressure30.15 inHg
Wind16.2 mph SE
Humidity46%
Visibility6.2 mi
Dew point37°
Tue, 2070° / 44°0Clear
70 °Clear

Arpan, Tuesday, 20 October

Clear. High 70°, low 44°.

Pressure29.97 inHg
Wind3.5 mph NE
Humidity53%
Visibility6.2 mi
Dew point44°
Wed, 2167° / 46°0Clear
67 °Clear

Arpan, Wednesday, 21 October

Clear. High 67°, low 46°.

Pressure30.18 inHg
Wind6 mph E
Humidity60%
Visibility6.2 mi
Dew point48°
Thu, 2276° / 52°0Overcast
76 °Overcast

Arpan, Thursday, 22 October

Overcast. High 76°, low 52°.

Pressure29.91 inHg
Wind20.1 mph SE
Humidity52%
Visibility—
Dew point49°
Fri, 2374° / 49°0.02Light rain
74 °Light rain

Arpan, Friday, 23 October

Light rain. High 74°, low 49°.

Pressure29.59 inHg
Wind21.7 mph NW
Humidity46%
Visibility—
Dew point50°
Sat, 2448° / 38°1.05Rain
48 °Rain

Arpan, Saturday, 24 October

Rain. High 48°, low 38°.

Pressure30.45 inHg
Wind22.7 mph NW
Humidity54%
Visibility—
Dew point28°
Sun, 2556° / 34°0Clear
56 °Clear

Arpan, Sunday, 25 October

Clear. High 56°, low 34°.

Pressure30.42 inHg
Wind8.9 mph SE
Humidity36%
Visibility—
Dew point22°
Mon, 2662° / 40°0Clear
62 °Clear

Arpan, Monday, 26 October

Clear. High 62°, low 40°.

Pressure30.06 inHg
Wind10.8 mph SE
Humidity26%
Visibility—
Dew point21°
Tue, 2765° / 42°0Overcast
65 °Overcast

Arpan, Tuesday, 27 October

Overcast. High 65°, low 42°.

Pressure29.68 inHg
Wind7.2 mph SW
Humidity38%
Visibility—
Dew point34°
Wed, 2864° / 48°0Clear
64 °Clear

Arpan, Wednesday, 28 October

Clear. High 64°, low 48°.

Pressure29.59 inHg
Wind9.4 mph W
Humidity33%
Visibility—
Dew point32°
Thu, 2957° / 46°0Partly cloudy
57 °Partly cloudy

Arpan, Thursday, 29 October

Partly cloudy. High 57°, low 46°.

Pressure29.85 inHg
Wind19.9 mph NW
Humidity35%
Visibility—
Dew point27°
Fri, 3067° / 43°0Clear
67 °Clear

Arpan, Friday, 30 October

Clear. High 67°, low 43°.

Pressure29.62 inHg
Wind11.5 mph S
Humidity32%
Visibility—
Dew point28°
Sat, 3154° / 41°0Overcast
54 °Overcast

Arpan, Saturday, 31 October

Overcast. High 54°, low 41°.

Pressure29.62 inHg
Wind19.1 mph NW
Humidity76%
Visibility—
Dew point37°
Sun, 0167° / 41°0Clear
67 °Clear

Arpan, Sunday, 1 November

Clear. High 67°, low 41°.

Pressure29.65 inHg
Wind18.5 mph W
Humidity27%
Visibility—
Dew point27°
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.