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As of 17:43 MDT

Weather in Arpan, SD

68°Current weather

Arpan, Saturday, 17 October, 17:43

Overcast. Feels like 66°. High 78°, low 45°.

Pressure29.91 inHg
Wind5 mph SE
Humidity28%
Visibility6.2 mi
Dew point34°

Monthly outlook for Arpan, SD: average high 66.6°, average low 46.3°. That is 5.8° above the climate normal for October. Precipitation is expected on 1 day (about 0.3 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 22 October (79.4°), the coolest 31 October (40°).

66.6°/46.3°
Average high / low
+5.8°
Above normal
1 / 3
Wet days / normal
0.3 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
17 October – 26 October66.6°58.3°+4.6°
27 October – 5 November66.6°51.9°+8.1°
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°.

Pressure30.12 inHg
Wind5.1 mph N
Humidity32%
Visibility6.2 mi
Dew point35°
Mon, 1961° / 42°0Clear
61 °Clear

Arpan, Monday, 19 October

Clear. High 61°, low 42°.

Pressure30.15 inHg
Wind16.6 mph SE
Humidity50%
Visibility6.2 mi
Dew point40°
Tue, 2071° / 44°0Clear
71 °Clear

Arpan, Tuesday, 20 October

Clear. High 71°, low 44°.

Pressure29.97 inHg
Wind3.6 mph E
Humidity51%
Visibility6.2 mi
Dew point45°
Wed, 2166° / 45°0Clear
66 °Clear

Arpan, Wednesday, 21 October

Clear. High 66°, low 45°.

Pressure30.18 inHg
Wind5.9 mph E
Humidity64%
Visibility6.2 mi
Dew point48°
Thu, 2279° / 52°0Partly cloudy
79 °Partly cloudy

Arpan, Thursday, 22 October

Partly cloudy. High 79°, low 52°.

Pressure29.91 inHg
Wind15.4 mph SE
Humidity51%
Visibility—
Dew point49°
Fri, 2364° / 55°0Light rain
64 °Light rain

Arpan, Friday, 23 October

Light rain. High 64°, low 55°.

Pressure29.80 inHg
Wind13.9 mph N
Humidity71%
Visibility—
Dew point49°
Sat, 2453° / 44°0.31Rain
53 °Rain

Arpan, Saturday, 24 October

Rain. High 53°, low 44°.

Pressure30.27 inHg
Wind9.9 mph N
Humidity72%
Visibility—
Dew point38°
Sun, 2562° / 40°0Clear
62 °Clear

Arpan, Sunday, 25 October

Clear. High 62°, low 40°.

Pressure30.12 inHg
Wind12.3 mph NW
Humidity54%
Visibility—
Dew point39°
Mon, 2663° / 43°0Clear
63 °Clear

Arpan, Monday, 26 October

Clear. High 63°, low 43°.

Pressure30.12 inHg
Wind16.2 mph SE
Humidity50%
Visibility—
Dew point38°
Tue, 2775° / 47°0Clear
75 °Clear

Arpan, Tuesday, 27 October

Clear. High 75°, low 47°.

Pressure29.83 inHg
Wind20.7 mph SE
Humidity40%
Visibility—
Dew point40°
Wed, 2871° / 58°0Partly cloudy
71 °Partly cloudy

Arpan, Wednesday, 28 October

Partly cloudy. High 71°, low 58°.

Pressure29.50 inHg
Wind21.2 mph NW
Humidity37%
Visibility—
Dew point40°
Thu, 2971° / 52°0Partly cloudy
71 °Partly cloudy

Arpan, Thursday, 29 October

Partly cloudy. High 71°, low 52°.

Pressure29.56 inHg
Wind24.8 mph NW
Humidity30%
Visibility—
Dew point33°
Fri, 3053° / 43°0Overcast
53 °Overcast

Arpan, Friday, 30 October

Overcast. High 53°, low 43°.

Pressure29.71 inHg
Wind8.9 mph S
Humidity31%
Visibility—
Dew point20°
Sat, 3169° / 40°0Mostly clear
69 °Mostly clear

Arpan, Saturday, 31 October

Mostly clear. High 69°, low 40°.

Pressure29.59 inHg
Wind29.7 mph SW
Humidity26%
Visibility—
Dew point23°
Sun, 0162° / 41°0Partly cloudy
62 °Partly cloudy

Arpan, Sunday, 1 November

Partly cloudy. High 62°, low 41°.

Pressure29.88 inHg
Wind23.7 mph W
Humidity14%
Visibility—
Dew point8°
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.