August weather forecast
Arnold, MO

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Weather in August

August, the last month of the summer in Arnold, is also a moderately hot month, with an average temperature fluctuating between 66.9°F (19.4°C) and 85.6°F (29.8°C).

Temperature

In August, Arnold notes an average high-temperature of a moderately hot 85.6°F (29.8°C), hardly different from the preceding month. Throughout the month of August, Arnold witnesses an average low-temperature of 66.9°F (19.4°C).

Heat index

August's average heat index is appraised at a sweltering 96.8°F (36°C). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', reflects the feeling of heat when considering both air temperature and humidity. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

In August, the average relative humidity is 75%.

Rainfall

In Arnold, during August, the rain falls for 14.1 days and regularly aggregates up to 3.39" (86mm) of precipitation. In Arnold, during the entire year, the rain falls for 146.1 days and collects up to 32.36" (822mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in August is 13h and 37min.
On the first day of the month, sunrise is at 6:04 am and sunset at 8:11 pm. On the last day of August, sunrise is at 6:30 am and sunset at 7:32 pm CDT.

Sunshine

The average sunshine in August is 10.2h.

UV index

May 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 hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 6 in August interprets into the following recommendations:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. 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. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Updated: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in August?

The average high-temperature and low-temperature during August are 85.6°F (29.8°C) and 66.9°F (19.4°C) respectively. The average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is appraised at 96.8°F (36°C).

What is the average humidity in August?

In August, the average relative humidity is 75%.

How many days does it rain in August?

In Arnold, in August, during 14.1 rainfall days, 3.39" (86mm) of precipitation is typically accumulated.

When it does not snow?

April through October are months without snowfall.

What is the average length of the day in August in Arnold?

In August, the average day length is 13h and 37min.

When is the sunrise / sunset in August?

In August, on the first day of the month, sunrise is at 6:04 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 6:30 am and sunset at 7:32 pm CDT.

How long on average sun shines in August?

The average sunshine duration in August is 10.2h.

What are the months with the highest UV index?

The months with the highest UV index are May 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 value of 6 to 7 symbolizes a high health risk 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
Arnold, MO

Average temperature in August - Arnold, MO
  • Average high temperature in August: 85.6°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in August: 66.9°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in August
Arnold, MO

Average pressure in August - Arnold, MO
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in August
Arnold, MO

Average wind speed in August - Arnold, MO
  • Average wind speed in August: 5.5mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in August
Arnold, MO

Average humidity in August - Arnold, MO
  • Average humidity in August: 75%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).

Average rainfall in August
Arnold, MO

Average rainfall in August - Arnold, MO
  • Average rainfall in August: 3.39"

The wettest month (with the highest rainfall) is May (3.94").
The driest months (with the least rainfall) are February and November (1.77").

Average rainfall days in August
Arnold, MO

Average rainfall days in August - Arnold, MO
  • Average rainfall days in August: 14.1 days

The month with the highest number of rainy days is July (16.9 days).
The months with the least rainy days are January and February (6.8 days).

Average snowfall in August
Arnold, MO

Average snowfall in August - Arnold, MO
  • Average snowfall in August: 0"

The month with the highest snowfall is February (2.6").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in August
Arnold, MO

Average snowfall days in August - Arnold, MO
  • Average snowfall days in August: 0 days

The months with the highest number of snowfall days are January and February (4.8 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
Arnold, MO

Average daylight in August / Average sunshine in August - Arnold, MO
  • Average daylight in August: 13h and 4min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in August: 10h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

Average sunshine days in August
Arnold, MO

Average sunshine days in August - Arnold, MO
  • Average sunshine days in August: 14.3 days

The month with the most sunshine days is January (20.9 days).
The month with the least sunshine days is June (11.6 days).

Average UV index in August
Arnold, MO

Average UV index in August - Arnold, MO
  • Average UV index in August: 6

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

Average cloud cover in August
Arnold, MO

Average cloud cover in August - Arnold, MO
  • Average cloud cover in August: 28

The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in August
Arnold, MO

Average visibility in August - Arnold, MO
  • 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).

Arnold, Missouri, USA

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