August weather forecast
Harrison, SD

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Weather in August

The last month of the summer, August, is also a moderately hot month in Harrison, South Dakota, with an average temperature ranging between max 85.1°F (29.5°C) and min 62.8°F (17.1°C).

Temperature

The advent of August presents an average high-temperature of a moderately hot 85.1°F (29.5°C), maintaining a close correlation with the preceding month. Harrison demonstrates a significant disparity from daytime highs throughout the month of August, with an average nighttime temperature of 62.8°F (17.1°C).

Heat index

In August, the average heat index is computed to be a tropical 91.4°F (33°C). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', gauges the sensation of temperature factoring in the air's moisture content. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. 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

In Harrison, the average relative humidity in August is 65%.

Rainfall

In Harrison, during August, the rain falls for 11.3 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, there are 104.1 rainfall days, and 14.29" (363mm) of precipitation is accumulated.

Snowfall

In Harrison, snow does not fall in May through September.

Daylight

The average length of the day in August is 13h and 55min.
On the first day of the month, sunrise is at 6:24 am and sunset at 8:56 pm. On the last day of August, sunrise is at 6:57 am and sunset at 8:10 pm CDT.

Sunshine

In August, the average sunshine is 10.5h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 6 during August leads to these advisories:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in August?

The high-temperature during August is 85.1°F (29.5°C) and the low-temperature is 62.8°F (17.1°C). The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 91.4°F (33°C).

What is the average humidity in August?

The average relative humidity in August is 65%.

How much does it rain in Harrison in August?

In August, the rain falls for 11.3 days. Throughout August, 1.46" (37mm) of precipitation is accumulated.

When it does not snow?

In Harrison, snow does not fall in May through September.

What is the average length of the day in August?

In Harrison, the average day length in August is 13h and 55min.

What time are sunrise and sunset in August?

On the first day of August, sunrise is at 6:24 am and sunset at 8:56 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 8:10 pm CDT.

How many hours of sunshine does Harrison have in August?

In August, the average sunshine duration is 10.5h.

When is the highest UV index in Harrison?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the UV index reading in August?

The average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Harrison, SD

Average temperature in August - Harrison, SD
  • Average high temperature in August: 85.1°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in August: 62.8°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).

Average pressure in August
Harrison, SD

Average pressure in August - Harrison, SD
  • Average pressure in August: 29.92"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in August
Harrison, SD

Average wind speed in August - Harrison, SD
  • Average wind speed in August: 8.5mph

The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).

Average humidity in August
Harrison, SD

Average humidity in August - Harrison, SD
  • Average humidity in August: 65%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (62%).

Average rainfall in August
Harrison, SD

Average rainfall in August - Harrison, SD
  • Average rainfall in August: 1.46"

The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is February (0.31").

Average rainfall days in August
Harrison, SD

Average rainfall days in August - Harrison, SD
  • Average rainfall days in August: 11.3 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (2.9 days).

Average snowfall in August
Harrison, SD

Average snowfall in August - Harrison, SD
  • Average snowfall in August: 0"

The months with the highest snowfall are January and March (1.93").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in August
Harrison, SD

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

The month with the highest number of snowfall days is January (8.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in August / Average sunshine in August - Harrison, SD
  • Average daylight in August: 13h and 5min

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 August: 10h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days in August
Harrison, SD

Average sunshine days in August - Harrison, SD
  • Average sunshine days in August: 16.7 days

The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (12.3 days).

Average UV index in August
Harrison, SD

Average UV index in August - Harrison, SD
  • Average UV index in August: 6

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in August
Harrison, SD

Average cloud cover in August - Harrison, SD
  • Average cloud cover in August: 24

The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 23).

Average visibility in August
Harrison, SD

Average visibility in August - Harrison, 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).

Harrison, South Dakota, USA

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