August weather forecast
Clayton, MO

Share

Weather in August

August, the last month of the summer in Clayton, is another warm month, with temperature in the range of an average high of 85.5°F (29.7°C) and an average low of 67.1°F (19.5°C).

Temperature

Clayton's average high-temperature in August sits at a moderately hot 85.5°F (29.7°C), showing little difference from the previous month. Clayton witnesses an average low-temperature of 67.1°F (19.5°C) throughout the month of August.

Heat index

For August, the heat index is computed to be a sweltering 95°F (35°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Heat index specifics point out values are for conditions of shade and a slight breeze. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

The average relative humidity in August is 75%.

Rainfall

In August, in Clayton, the rain falls for 14.2 days. Throughout August, 3.31" (84mm) of precipitation is accumulated. Throughout the year, there are 144.8 rainfall days, and 30.59" (777mm) of precipitation is accumulated.

Snowfall

In Clayton, snow does not fall in April through October.

Daylight

The average length of the day in August is 13h and 37min.
On the first day of the month, sunrise is at 6:03 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

In Clayton, the average sunshine in August is 10.3h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index of 6 in August interprets into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Resources | Updated: Feb 12, 2024 | Published by: Weather U.S.

Frequently asked questions

How hot is it in Clayton in August?

Clayton in August has an average high-temperature of 85.5°F (29.7°C) and an average low-temperature of 67.1°F (19.5°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in August is computed to be 95°F (35°C).

What is the average humidity in August in Clayton?

In Clayton, Missouri, the average relative humidity in August is 75%.

How many days does it rain in August in Clayton?

In Clayton, Missouri, in August, it is raining for 14.2 days, with typically 3.31" (84mm) of accumulated precipitation.

When it does not snow in Clayton?

In Clayton, Missouri, snow does not fall in April through October.

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

The average day length in August in Clayton is 13h and 37min.

When are sunrise and sunset in August in Clayton?

In August, on the first day of the month, sunrise is at 6:03 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 many hours of sunshine does Clayton have in August?

In Clayton, Missouri, the average sunshine duration in August is 10.3h.

What is the month with the highest UV index in Clayton?

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

How high is the UV index in August in Clayton?

In August, the average daily maximum UV index in Clayton is 6. A UV Index estimate of 6 to 7 represents a high health threat from unsafe 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
Clayton, MO

Average temperature in August - Clayton, MO
  • Average high temperature in August: 85.5°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 (37.8°F).

  • Average low temperature in August: 67.1°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

[Resources]

Average pressure in August
Clayton, MO

Average pressure in August - Clayton, 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).

[Resources]

Average wind speed in August
Clayton, MO

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

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

[Resources]

Average humidity in August
Clayton, MO

Average humidity in August - Clayton, 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 (70%).

[Resources]

Average rainfall in August
Clayton, MO

Average rainfall in August - Clayton, MO
  • Average rainfall in August: 3.31"

The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is February (1.69").

[Resources]

Average rainfall days in August
Clayton, MO

Average rainfall days in August - Clayton, MO
  • Average rainfall days in August: 14.2 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.5 days).

[Resources]

Average snowfall in August
Clayton, MO

Average snowfall in August - Clayton, 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").

[Resources]

Average snowfall days in August
Clayton, MO

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

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

[Resources]

Average daylight in August /
Average sunshine in August
Clayton, MO

Average daylight in August / Average sunshine in August - Clayton, 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 2min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

[Resources]

Average sunshine days in August
Clayton, MO

Average sunshine days in August - Clayton, MO
  • Average sunshine days in August: 13.8 days

The month with the most sunshine days is January (21 days).
The month with the least sunshine days is June (11.2 days).

[Resources]

Average UV index in August
Clayton, MO

Average UV index in August - Clayton, 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).

[Resources]

Average cloud cover in August
Clayton, MO

Average cloud cover in August - Clayton, MO
  • Average cloud cover in August: 27

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

[Resources]

Average visibility in August
Clayton, MO

Average visibility in August - Clayton, 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).

[Resources]

Clayton, Missouri, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location