August weather forecast
Hayes, SD

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Weather in August

August, the last month of the summer in Hayes, is another tropical month, with temperature in the range of an average high of 87.1°F (30.6°C) and an average low of 66.9°F (19.4°C).

Temperature

Hayes's average high-temperature in August is a still hot 87.1°F (30.6°C), marking an insignificant difference from the 89.2°F (31.8°C) of July. Hayes's nights in August cool down to an average low-temperature of 66.9°F (19.4°C).

Heat index

The heat index value during August is calculated to be a hot 89.6°F (32°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
Be informed that the heat index values are oriented around shady conditions and gentle breezes. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', determines the feeling of heat when you account for the relative humidity. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. 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 are quite important for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.

Humidity

In August, the average relative humidity is 48%.

Rainfall

In Hayes, in August, during 10.8 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. Throughout the year, there are 95.3 rainfall days, and 13.74" (349mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in August is 13h and 58min.
On the first day of August, sunrise is at 5:32 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 6:06 am and sunset at 7:21 pm MDT.

Sunshine

With an average of 11.7h of sunshine, August has the most sunshine of the year.

UV index

The average daily maximum UV index in August is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily high UV index of 6 during August translates into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.

Frequently asked questions

Is it hot during August?

Hayes in August has an average high-temperature of 87.1°F (30.6°C) and an average low-temperature of 66.9°F (19.4°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is calculated to be 89.6°F (32°C).

What is the average humidity in August?

In Hayes, the average relative humidity in August is 48%.

How many days does it rain in August?

In Hayes, in August, during 10.8 rainfall days, 1.18" (30mm) of precipitation is typically accumulated.

When it does not snow?

June through September are months without snowfall.

How many hours of daylight does Hayes have in August?

In Hayes, the average day length in August is 13h and 58min.

When is the sunrise / sunset in August?

In August, on the first day of the month, sunrise is at 5:32 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 6:06 am and sunset at 7:21 pm MDT.

What month has the most sunshine?

The month with the most sunshine is August, with an average of 11.7h of sunshine.

How long on average sun shines in August?

In August, the average sunshine duration is 11.7h.

How high is the UV index in August?

In Hayes, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health threat from exposure to the Sun's UV radiation.
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
Hayes, SD

Average temperature in August - Hayes, SD
  • Average high temperature in August: 87.1°F

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (29.8°F).

  • Average low temperature in August: 66.9°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).

Average pressure in August
Hayes, SD

Average pressure in August - Hayes, SD
  • Average pressure in August: 29.9"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in August
Hayes, SD

Average wind speed in August - Hayes, SD
  • Average wind speed in August: 10.2mph

The windiest month (with the highest average wind speed) is April (12.1mph).
The calmest month (with the lowest average wind speed) is February (10.1mph).

Average humidity in August
Hayes, SD

Average humidity in August - Hayes, SD
  • Average humidity in August: 48%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is September (47%).

Average rainfall in August
Hayes, SD

Average rainfall in August - Hayes, SD
  • Average rainfall in August: 1.18"

The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is January (0.39").

Average rainfall days in August
Hayes, SD

Average rainfall days in August - Hayes, SD
  • Average rainfall days in August: 10.8 days

The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is February (2.6 days).

Average snowfall in August
Hayes, SD

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

The month with the highest snowfall is February (3.15").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in August
Hayes, SD

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

The month with the highest number of snowfall days is February (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in August / Average sunshine in August - Hayes, 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 4min

The month with the most sunshine is August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).

Average sunshine days in August
Hayes, SD

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

The month with the most sunshine days is December (21.1 days).
The months with the least sunshine days are April and June (14.1 days).

Average UV index in August
Hayes, SD

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

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in August
Hayes, SD

Average cloud cover in August - Hayes, SD
  • Average cloud cover in August: 18

The month with the most cloud cover is January (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 18).

Average visibility in August
Hayes, SD

Average visibility in August - Hayes, 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).

Hayes, South Dakota, USA

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