October weather forecast
Custer, SD

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Large, scenic rocks and trees around this tiny Sylvan Lake located in the tranquil Custer State Park in Custer City, South Dakota
Large, scenic rocks and trees around this tiny Sylvan Lake located in the tranquil Custer State Park in Custer City, South Dakota

Weather in October

October, in Custer, is synonymous with the heightened brilliance of autumn, contrasting sharply with the fading colors seen in September. But with the beauty of fall also comes colder temperatures, especially in comparison to the mild warmth of September. Nature lovers can, however, expect to witness the magnificent color transition from green to mesmerizing hues of crimson, orange, and yellow. As the month progresses, weather changes herald the upcoming winter months, forcing the fall foliage to leave the trees sooner than desired.

Temperature

The shift into October is marked by a considerable temperature decrease, with the average high-temperature dropping from an agreeable 71.4°F in September to a fresh 54°F. Custer experiences an average temperature drop to a cold 36.7°F during October nights.

Humidity

In Custer, the average relative humidity in October is 61%.

Rainfall

In October, in Custer, the rain falls for 9 days. Throughout October, 1.14" of precipitation is accumulated. In Custer, during the entire year, the rain falls for 135.4 days and collects up to 20.39" of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Custer, during October, snow falls for 5.3 days and regularly aggregates up to 3.66" of snow. In Custer, during the entire year, snow falls for 75.1 days and aggregates up to 40.24" of snow.

Daylight

In Custer, the average length of the day in October is 10h and 59min.
On the first day of the month, sunrise is at 6:52 am and sunset at 6:36 pm. On the last day of October, in Custer, sunrise is at 7:29 am and sunset at 5:46 pm MDT.

Sunshine

In Custer, the average sunshine in October is 7.1h.

UV index

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 2 during October leads to these instructions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
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FAQ

What is the usual temperature for Custer in October?

In Custer, in October, the average high-temperature is 54°F, and the average low-temperature is 36.7°F. In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is evaluated at 82.4°F.

What is the average humidity in October in Custer?

The average relative humidity in October in Custer, South Dakota, is 61%.

How many days does it rain in October in Custer?

In Custer, during October, the rain falls for 9 days and regularly aggregates up to 1.14" of precipitation.

How much does it snow in Custer in October?

In Custer, South Dakota, in October, during 5.3 snowfall days, 3.66" of snow is typically accumulated.

How many hours of daylight does Custer have in October?

In Custer, the average day length in October is 10h and 59min.

What time are sunrise and sunset in October in Custer?

On the first day of October in Custer, South Dakota, sunrise is at 6:52 am and sunset at 6:36 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:46 pm MDT.

How many hours of sunshine does Custer have in October?

The average sunshine duration in October in Custer, South Dakota, is 7.1h.

When is the lowest UV index in Custer?

The months with the lowest UV index in Custer are January through March, October through December, with an average maximum UV index of 2.

What is the UV index reading in October in Custer?

In Custer, South Dakota, the average daily maximum UV index in October is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASOctoberND
Sep
October
Nov
Average high temperature
71.4°F
54°F
42.3°F
Average low temperature
51.1°F
36.7°F
25.9°F
Average pressure
29.93"Hg
29.98"Hg
30.05"Hg
Average wind speed
8.1mph
9.1mph
8.6mph
Average max. wind speed
8.6mph
9.9mph
9.5mph
Average wind speed gusts
12.5mph
14.7mph
14.9mph
Average humidity
52%
61%
64%
Average rainfall
1.22"
1.14"
0.63"
Average rainfall days
10
9
4.5
Average snowfall
0.35"
3.66"
4.09"
Average snowfall days
0.4
5.3
9.2
Average daylight
12h 3min
11h 0min
9h 4min
Average sunshine
10h 3min
7h 1min
6h 4min
Average sunshine days
17.3
17.4
19.2
Average UV index
4
2
2
Average cloud cover
18%
27%
29%
Average visibility
6mi
6mi
6mi

Average temperature in October
Custer, SD

Average temperature in October - Custer, SD
  • Average high temperature in October: 54°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (29.8°F).

  • Average low temperature in October: 36.7°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).

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Average pressure in October
Custer, SD

Average pressure in October - Custer, SD
  • Average pressure in October: 29.98"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in October
Custer, SD

Average wind speed in October - Custer, SD
  • Average wind speed in October: 9.1mph

The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in October
Custer, SD

Average humidity in October - Custer, SD
  • Average humidity in October: 61%

The months with the highest relative humidity are January and February (77%).
The months with the lowest relative humidity are August and September (52%).

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Average rainfall in October
Custer, SD

Average rainfall in October - Custer, SD
  • Average rainfall in October: 1.14"

The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in October
Custer, SD

Average rainfall days in October - Custer, SD
  • Average rainfall days in October: 9 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is November (4.5 days).

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Average snowfall in October
Custer, SD

Average snowfall in October - Custer, SD
  • Average snowfall in October: 3.66"

The month with the highest snowfall is April (7.24").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in October
Custer, SD

Average snowfall days in October - Custer, SD
  • Average snowfall days in October: 5.3 days

The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in October /
Average sunshine in October
Custer, SD

Average daylight in October / Average sunshine in October - Custer, SD
  • Average daylight in October: 11h and 0min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in October: 7h and 1min

The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).

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Average sunshine days in October
Custer, SD

Average sunshine days in October - Custer, SD
  • Average sunshine days in October: 17.4 days

The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (7.8 days).

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Average UV index in October
Custer, SD

Average UV index in October - Custer, SD
  • Average UV index in October: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in October
Custer, SD

Average cloud cover in October - Custer, SD
  • Average cloud cover in October: 27

The month with the most cloud cover is April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in October
Custer, SD

Average visibility in October - Custer, SD
  • Average visibility in October: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Custer, South Dakota, USA

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