August weather forecast
Spearfish, SD

The peaceful and quiet area in the Trout Fishing Pond in the scenic Spearfish Canyon, South Dakota, in the Summer Sportsman Paradise
The peaceful and quiet area in the Trout Fishing Pond in the scenic Spearfish Canyon, South Dakota, in the Summer Sportsman Paradise

Weather in August

The last month of the summer, August, is also a moderately hot month in Spearfish, South Dakota, with temperature in the range of an average high of 81.9°F (27.7°C) and an average low of 59.4°F (15.2°C).

Temperature

In August, the average high-temperature is essentially the same as in July - a still moderately hot 81.9°F (27.7°C). The average low-temperature, in August, is 59.4°F (15.2°C).

Heat index

The average heat index is calculated to be 82.4°F (28°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, metabolic differences, wind), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

With an average relative humidity of 49%, August is the least humid month.

Rainfall

In Spearfish, it is raining for 11.8 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, in Spearfish, South Dakota, there are 99.6 rainfall days, and 15.63" (397mm) of precipitation is accumulated.

Snowfall

In Spearfish snow does not fall in June through August.

Daylight

In August, the average length of the day is 14h.

Sunshine

The month with the most sunshine in Spearfish, South Dakota, is August, with an average of 11.7h of sunshine.

UV index

The average daily maximum UV index in August is 5. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in August in Spearfish?

In August, the average high-temperature is 81.9°F (27.7°C), and the average low-temperature is 59.4°F (15.2°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is calculated to be 82.4°F (28°C).

What is the least humid month in Spearfish?

The least humid month in Spearfish, South Dakota, is August, with an average relative humidity of 49%.

What is the average humidity in August in Spearfish?

The average relative humidity in August in Spearfish is 49%.

How much does it rain in Spearfish in August?

In August, in Spearfish, the rain falls for 11.8 days. Throughout August, 1.54" (39mm) of precipitation is accumulated.

When it does not snow in Spearfish?

June through August are months without snowfall in Spearfish, South Dakota.

Does it snow in Spearfish in August?

In Spearfish, in August, it doesn't snow. In September, it regularly snows.

What is the average length of the day in August in Spearfish?

In August, the average length of the day in Spearfish, South Dakota, is 14h.

What month has the most sunshine in Spearfish?

August has the most sunshine of the year in Spearfish, with an average of 11.7h of sunshine.

How long on average sun shines in August in Spearfish?

In Spearfish, the average sunshine in August is 11.7h.

How high is the UV index in August in Spearfish?

In Spearfish, the average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in August
Spearfish, SD

Average temperature in August - Spearfish, SD
  • Average high temperature in August: 27.7°C

The warmest month (with the highest average high temperature) is July (28.8°C).
The month with the lowest average high temperature is December (-0.6°C).

  • Average low temperature in August: 15.2°C

The month with the highest average low temperature is July (16.1°C).
The coldest month (with the lowest average low temperature) is February (-8.8°C).

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Average pressure in August
Spearfish, SD

Average pressure in August - Spearfish, SD
  • Average pressure in August: 1012.3mbar

The month with the highest atmospheric pressure is January (1020.5mbar).
The month with the lowest atmospheric pressure is June (1010.5mbar).

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Average wind speed in August
Spearfish, SD

Average wind speed in August - Spearfish, SD
  • Average wind speed in August: 12.9km/h

The windiest month (with the highest average wind speed) is January (16.4km/h).
The calmest month (with the lowest average wind speed) is August (12.9km/h).

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Average humidity in August
Spearfish, SD

Average humidity in August - Spearfish, SD
  • Average humidity in August: 49%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (49%).

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Average rainfall in August
Spearfish, SD

Average rainfall in August - Spearfish, SD
  • Average rainfall in August: 39mm

The wettest month (with the highest rainfall) is May (59mm).
The driest month (with the least rainfall) is January (15mm).

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Average rainfall days in August
Spearfish, SD

Average rainfall days in August - Spearfish, SD
  • Average rainfall days in August: 11.8 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (2.9 days).

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Average snowfall in August
Spearfish, SD

Average snowfall in August - Spearfish, SD
  • Average snowfall in August: 0mm

The month with the highest snowfall is April (187mm).
Months with the least snowfall are June, July and August (0mm).

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Average snowfall days in August
Spearfish, SD

Average snowfall days in August - Spearfish, SD
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (11.2 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in August /
Average sunshine in August
Spearfish, SD

Average daylight in August / Average sunshine in August - Spearfish, SD
  • Average daylight in August: 14h

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in August: 11.7h

The month with the most sunshine is August (Average sunshine: 11.7h).
The month with the least sunshine is February (Average sunshine: 5.7h).

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Average sunshine days in August
Spearfish, SD

Average sunshine days in August - Spearfish, SD
  • Average sunshine days in August: 14.6 days

The month with the most sunshine days is November (20.3 days).
The month with the least sunshine days is May (12.7 days).

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Average UV index in August
Spearfish, SD

Average UV index in August - Spearfish, SD
  • Average UV index in August: 5

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

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Average cloud cover in August
Spearfish, SD

Average cloud cover in August - Spearfish, SD
  • Average cloud cover in August: 16

The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in August
Spearfish, SD

Average visibility in August - Spearfish, SD
  • Average visibility in August: 10km

Months with the highest visibility are June, July, August and September (10km).
Months with the lowest visibility are January, February, March, April, May, October, November and December (9km).

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