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August Weather in Spearfish, United States

Last updated: June 24, 2025

In Spearfish, United States, the average temperature in August hovers around 20°C (69°F), with a minimum dip to 5°C (42°F) and a sweltering maximum of 37°C (99°F). Expect 58 mm (2.3 in) of precipitation over approximately 8 days, accompanied by a notable average humidity of 84%.

August Temperature in Spearfish

In August in Spearfish, the average temperature is 20°C (69°F). Maximum temperatures can reach 37°C (99°F), while the minimum can drop as low as 5°C (42°F). Be sure to pack accordingly, as you may experience a wide range of temperatures during your travels.

August Weather in Spearfish: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Spearfish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Spearfish, August typically has an average temperature of 20°C (69°F), with highs reaching up to 37°C (99°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec262135415266726961443730
Data source: Temperature data for Spearfish generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Spearfish

In Spearfish in August, the precipitation amount is 58 mm (2.3 in) over a span of 8 days.

August Precipitation Trends in Spearfish

The chart displays monthly precipitation patterns in Spearfish, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Spearfish, August typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec223339749865885843652131
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Spearfish

In Spearfish in August humidity is 84%. With an average temperature of 20°C (69°F), this humidity feels like walking through a warm, moist blanket, making travel feel heavy and slightly fatigued as the heat clings to your skin and leaves you yearning for a refreshing breeze.

August Average Humidity in Spearfish

This chart illustrates the average monthly humidity levels in Spearfish, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Spearfish is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%70%70%76%84%85%85%77%73%74%79%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Spearfish

In Spearfish in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Spearfish.

Maximum UV Index Levels in Spearfish for August

The chart shows the monthly maximum UV Index (UVI) for Spearfish in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Spearfish typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346991111108532
Data source: Spearfish August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Spearfish Compares to Other Months

Weather in Spearfish varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Spearfish, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Spearfish, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)22 mm (0.8 inches)77%moderate
February Weather-6°C (21°F)33 mm (1.3 inches)80%moderate
March Weather2°C (35°F)39 mm (1.5 inches)70%high
April Weather5°C (41°F)74 mm (2.9 inches)70%very high
May Weather11°C (52°F)98 mm (3.9 inches)76%very high
June Weather19°C (66°F)65 mm (2.6 inches)84%extreme
July Weather22°C (72°F)88 mm (3.4 inches)85%extreme
August Weather20°C (69°F)58 mm (2.3 inches)84%very high
September Weather16°C (61°F)43 mm (1.7 inches)77%very high
October Weather7°C (44°F)65 mm (2.5 inches)73%moderate
November Weather3°C (37°F)21 mm (0.8 inches)74%moderate
December Weather-1°C (30°F)31 mm (1.2 inches)79%low

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