August weather forecast
Alpena, SD

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Weather in August

The last month of the summer, August, is another warm month in Alpena, South Dakota, with an average temperature fluctuating between 84.2°F (29°C) and 61.3°F (16.3°C).

Temperature

Alpena ushers in August with an average high-temperature of a still moderately hot 84.2°F (29°C), showing a close resemblance to the previous month. Alpena demonstrates a significant disparity from daytime highs throughout the month of August, with an average nighttime temperature of 61.3°F (16.3°C).

Heat index

For most parts of August, the heat index is estimated at a hot 89.6°F (32°C). Persisting in activity during long-term exposure might induce weariness, with subsequent heat cramps.
Data suggests that the heat index is set for environments in shade and with a light wind. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', offers an insight into how hot it feels when we factor in moisture content. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.

Humidity

In August, the average relative humidity is 63%.

Rainfall

In Alpena, in August, it is raining for 11.6 days, with typically 1.97" (50mm) of accumulated precipitation. Throughout the year, there are 101.8 rainfall days, and 18.19" (462mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In Alpena, the average length of the day in August is 13h and 58min.
On the first day of August, sunrise is at 6:22 am and sunset at 8:57 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 8:10 pm CDT.

Sunshine

In Alpena, the average sunshine in August is 10.8h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: In August, the UV index of 6 transforms into the following advice:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Updated: Aug 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot during August?

In Alpena, in August, the average high-temperature is 84.2°F (29°C), and the average low-temperature is 61.3°F (16.3°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 estimated at 89.6°F (32°C).

What is the average humidity in August?

In Alpena, the average relative humidity in August is 63%.

How many days does it rain in August?

In Alpena, in August, during 11.6 rainfall days, 1.97" (50mm) of precipitation is typically accumulated.

When it does not snow?

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

How many hours of daylight does Alpena have in August?

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

When are sunrise and sunset in August?

In August, on the first day of the month, sunrise is at 6:22 am and sunset at 8:57 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 8:10 pm CDT.

How long on average sun shines in August?

In Alpena, the average sunshine duration in August is 10.8h.

What are the months with the highest UV index?

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

How high is the UV index in August?

In August, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to 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
Alpena, SD

Average temperature in August - Alpena, SD
  • Average high temperature in August: 84.2°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (23.2°F).

  • Average low temperature in August: 61.3°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (8.2°F).

Average pressure in August
Alpena, SD

Average pressure in August - Alpena, SD
  • Average pressure in August: 29.91"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
Alpena, SD

Average wind speed in August - Alpena, SD
  • Average wind speed in August: 8.6mph

The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (8.6mph).

Average humidity in August
Alpena, SD

Average humidity in August - Alpena, SD
  • Average humidity in August: 63%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is September (62%).

Average rainfall in August
Alpena, SD

Average rainfall in August - Alpena, SD
  • Average rainfall in August: 1.97"

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
Alpena, SD

Average rainfall days in August - Alpena, SD
  • Average rainfall days in August: 11.6 days

The month with the highest number of rainy days is June (15.2 days).
The month with the least rainy days is February (1.8 days).

Average snowfall in August
Alpena, SD

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

The month with the highest snowfall is February (3.54").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in August
Alpena, SD

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

The month with the highest number of snowfall days is December (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in August / Average sunshine in August - Alpena, 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: 10h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

Average sunshine days in August
Alpena, SD

Average sunshine days in August - Alpena, SD
  • Average sunshine days in August: 15.8 days

The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is June (12.3 days).

Average UV index in August
Alpena, SD

Average UV index in August - Alpena, 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 and November (UV index 1).

Average cloud cover in August
Alpena, SD

Average cloud cover in August - Alpena, SD
  • Average cloud cover in August: 23

The month with the most cloud cover is January (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 22).

Average visibility in August
Alpena, SD

Average visibility in August - Alpena, 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).

Alpena, South Dakota, USA

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