August weather forecastSpearfish, SD
August
Weather in August
As Spearfish advances towards the end of the summer season, August retains most of July’s warmth with an average high temperature of 81.9°F (27.7°C). By comparison, this peak summer month is slightly cooler and rainier than its predecessor. Despite a minor cloud cover increase, sunlight continues to be plentiful contributing to extended daylight hours. August holds onto summer's essence despite the slight dip in temperature. The marginal increase in wind speed fails to diminish the overall warm, sunny ambiance of the month.Temperature
August's beginning signals an average high-temperature of a still warm 81.9°F (27.7°C), barely different from July's 83.8°F (28.8°C). Spearfish's average nighttime temperatures present a clear contrast to its daytime highs, measured at a moderate 59.4°F (15.2°C) in August.Heat index
August's heat index is calculated to be 82.4°F (28°C). Continued exposure and engagement in activity might trigger tiredness and subsequently heat cramps.The standards for the heat index are set for locations in shade and under light breezes. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Humidity
The least humid month is August, with an average relative humidity of 49%.Rainfall
In Spearfish, in August, it is raining for 11.8 days, with typically 1.54" (39mm) of accumulated precipitation. In Spearfish, during the entire year, the rain falls for 99.6 days and collects up to 15.63" (397mm) of precipitation.Snowfall
In Spearfish, snow does not fall in June through August.Daylight
The average length of the day in August is 13h and 59min.On the first day of August, sunrise is at 5:43 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 7:33 pm MDT.
Sunshine
The month with the most sunshine is August, with an average of 11.7h of sunshine.UV index
The average daily maximum UV index in August in Spearfish is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In August, a daily maximum UV index of 5 leads to the following instructions:
Ensure safety - Sun damage prevention is strongly urged. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Spearfish, SD
- Average high temperature in August: 81.9°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (30.9°F).
- Average low temperature in August: 59.4°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).
Average pressure in August
Spearfish, SD
- Average pressure in August: 29.89"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in August
Spearfish, SD
- Average wind speed in August: 8mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (8mph).
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%).
Average rainfall in August
Spearfish, SD
- Average rainfall in August: 1.54"
The wettest month (with the highest rainfall) is May (2.32").
The driest month (with the least rainfall) is January (0.59").
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).
Average snowfall in August
Spearfish, SD
- Average snowfall in August: 0"
The month with the highest snowfall is April (7.36").
The months with the least snowfall are June, July and August (0").
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).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in August /
Average sunshine in August
Spearfish, SD
- Average daylight in August: 14h and 0min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in August: 11h and 42min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
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).
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).
The months with the lowest UV index are January, February, April, November and December (UV index 2).
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).
Average visibility in August
Spearfish, SD
- Average visibility in August: 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).
