August weather forecastOnaka, SD

August

Weather in August

The last month of the summer, August, is also a moderately hot month in Onaka, South Dakota, with an average temperature fluctuating between 63°F (17.2°C) and 83.8°F (28.8°C).

Temperature

Transitioning into August, Onaka records an average high-temperature of a still moderately hot 83.8°F (28.8°C), almost identical to July's 85.8°F (29.9°C). An average temperature of 63°F (17.2°C) is recorded during the nights in August.

Heat index

In August, the heat index is computed to be a hot 86°F (30°C). Enduring exposure and unrelenting activity might cause a state of weariness, potentially leading to heat cramps.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', arises from combining readings of air temperature and relative moisture content. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.

Humidity

August and September, with an average relative humidity of 56%, are the least humid months.

Rainfall

In Onaka, during August, the rain falls for 11.3 days and regularly aggregates up to 1.42" (36mm) of precipitation. Throughout the year, there are 97.8 rainfall days, and 16.65" (423mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

In Onaka, the average length of the day in August is 14h and 2min.
On the first day of August, sunrise is at 6:23 am and sunset at 9:04 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 8:16 pm CDT.

Sunshine

The average sunshine in August in Onaka is 10.7h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: In August, the maximum UV index of 6 translates into these guidelines:
Inhibit overexposure. Warding off sun damage is of utmost importance. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Employ a wide-brim hat for potent defense against up to 50% of UV rays.

Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Onaka, 83.8°F (28.8°C) is the average high-temperature and 63°F (17.2°C) is the average low-temperature during August. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is computed to be 86°F (30°C).

The months with the lowest humidity are August and September, with an average relative humidity of 56%.

In August, the average relative humidity is 56%.

In Onaka, in August, during 11.3 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.

In Onaka, snow does not fall in June through September.

In Onaka, the average day length in August is 14h and 2min.

On the first day of August in Onaka, sunrise is at 6:23 am and sunset at 9:04 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 8:16 pm CDT.

In August, the average sunshine duration is 10.7h.

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

In Onaka, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J August S O N D

Jul

August

Sep

Average high temperature

85.8°F

83.8°F

74.5°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

10.6mph

10.5mph

11.6mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

12.3

11.3

8.5

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

15.7

16.7

19.6

Average UV index

Average cloud cover

22%

25%

Average visibility

6mi

Average temperature in August
Onaka, SD

Average high temperature in August: 83.8°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (22.6°F).

Average low temperature in August: 63°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (9.1°F).

Average pressure in August
Onaka, SD

Average pressure in August: 29.9"Hg

The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

Average wind speed in August
Onaka, SD

Average wind speed in August: 9.7mph

The windiest month (with the highest average wind speed) is April (11.8mph).
The calmest month (with the lowest average wind speed) is August (9.7mph).

Average humidity in August
Onaka, SD

Average humidity in August: 56%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are August and September (56%).

Average rainfall in August
Onaka, SD

Average rainfall in August: 1.42"

The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.55").

Average rainfall days in August
Onaka, SD

Average rainfall days in August: 11.3 days

The month with the highest number of rainy days is June (14.4 days).
The month with the least rainy days is February (1.9 days).

Average snowfall in August
Onaka, SD

Average snowfall in August: 0"

The month with the highest snowfall is February (5.04").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in August
Onaka, SD

Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in August: 14h and 0min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

Average sunshine in August: 10h and 42min

The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in August
Onaka, SD

Average sunshine days in August: 16.7 days

The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (13.1 days).

Average UV index in August
Onaka, 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 1).

Average cloud cover in August
Onaka, SD

Average cloud cover in August: 22

The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are July and August (Cloud cover 22).

Average visibility in August
Onaka, SD

Average visibility in August: 6mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).