August weather forecast
Saint Peters, MO

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Weather in August

August is a persistently warm and humid month for Saint Peters, Missouri. Although temperatures begin to dip from their peak, they remain high contributing to a noticeable summer heat. August stands out due to its uniquely high average temperature of 85.3°F (29.6°C) amidst a slow cooling trend. With the continued rainfall, humidity remains prevalent. The transition into September brings forth a welcome cool down accompanied by decreased rainfall.

Temperature

Upon the onset of August, Saint Peters witnesses an average high-temperature of a moderately hot 85.3°F (29.6°C), showing a close resemblance to the prior month. Saint Peters's average low-temperature for the month of August records at a refreshing 66.4°F (19.1°C).

Heat index

August's mean heat index is evaluated at a fiery hot 95°F (35°C). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.
Be aware that heat index ratings are designed for shaded locations and minor breezes. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

In Saint Peters, the average relative humidity in August is 75%.

Rainfall

In August, in Saint Peters, the rain falls for 12.6 days. Throughout August, 2.4" (61mm) of precipitation is accumulated. In Saint Peters, during the entire year, the rain falls for 133.4 days and collects up to 20.98" (533mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in August in Saint Peters is 13h and 38min.
On the first day of August, sunrise is at 6:04 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 7:33 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 of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 6 in August translates into this advice:
Resist overexposure. Safeguarding from solar damage is indispensable. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
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Frequently asked questions

How hot is August in Saint Peters?

August temperatures in Saint Peters vary between a high-temperature of 85.3°F (29.6°C) and a low-temperature of 66.4°F (19.1°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, in August is evaluated at 95°F (35°C).

What is the average humidity in August in Saint Peters?

In August, the average relative humidity in Saint Peters is 75%.

How much does it rain in Saint Peters in August?

In Saint Peters, in August, during 12.6 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

When it does not snow in Saint Peters?

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

What is the average length of the day in August in Saint Peters?

In August, the average day length in Saint Peters is 13h and 38min.

When are sunrise and sunset in August in Saint Peters?

On the first day of August, sunrise is at 6:04 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 7:33 pm CDT.

How many hours of sunshine does Saint Peters have in August?

In August, the average sunshine duration in Saint Peters, Missouri, is 10.2h.

When is the highest UV index in Saint Peters?

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

What is the UV index reading in August in Saint Peters?

In Saint Peters, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health 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
Saint Peters, MO

Average temperature in August - Saint Peters, MO
  • Average high temperature in August: 85.3°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in August: 66.4°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

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Average pressure in August
Saint Peters, MO

Average pressure in August - Saint Peters, MO
  • Average pressure in August: 29.97"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).

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Average wind speed in August
Saint Peters, MO

Average wind speed in August - Saint Peters, MO
  • Average wind speed in August: 5.6mph

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

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Average humidity in August
Saint Peters, MO

Average humidity in August - Saint Peters, 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%).

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Average rainfall in August
Saint Peters, MO

Average rainfall in August - Saint Peters, MO
  • Average rainfall in August: 2.4"

The wettest month (with the highest rainfall) is April (2.48").
The driest month (with the least rainfall) is February (1.06").

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Average rainfall days in August
Saint Peters, MO

Average rainfall days in August - Saint Peters, MO
  • Average rainfall days in August: 12.6 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (6.7 days).

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Average snowfall in August
Saint Peters, MO

Average snowfall in August - Saint Peters, MO
  • Average snowfall in August: 0"

The month with the highest snowfall is February (1.65").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in August
Saint Peters, MO

Average snowfall days in August - Saint Peters, MO
  • Average snowfall days in August: 0 days

The months with the highest number of snowfall days are January and February (5.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Saint Peters, MO

Average daylight in August / Average sunshine in August - Saint Peters, 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 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 42min).

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Average sunshine days in August
Saint Peters, MO

Average sunshine days in August - Saint Peters, MO
  • Average sunshine days in August: 14.7 days

The month with the most sunshine days is January (20.4 days).
The month with the least sunshine days is July (12.7 days).

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Average UV index in August
Saint Peters, MO

Average UV index in August - Saint Peters, 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, November and December (UV index 2).

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Average cloud cover in August
Saint Peters, MO

Average cloud cover in August - Saint Peters, 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).

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Average visibility in August
Saint Peters, MO

Average visibility in August - Saint Peters, 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).

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Saint Peters, Missouri, USA

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