July weather forecast
Saint Peters, MO

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Weather in July

July in Saint Peters, Missouri, is the pinnacle of summer. It is characterized by the year's hottest temperatures, elevated humidity levels, and generous sunshine. The peak temperature for the year is experienced in July, with average highs reaching 87.1°F (30.6°C). Despite the heat, rainfall persists, contributing to the heightened humidity. August sustains the hot and humid weather pattern common to July.

Temperature

July tends to be the warmest month, with temperatures averaging a daily high of 87.1°F (30.6°C) and a low of 68.4°F (20.2°C).

Heat index

Throughout July, the heat index is calculated to be a fiery hot 102.2°F (39°C). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
Note that heat index values are valued for light wind and location in the shade. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

In July, the average relative humidity is 77%.

Rainfall

In July, the rain falls for 15.3 days. Throughout July, 2.32" (59mm) of precipitation is accumulated. Throughout the year, in Saint Peters, there are 133.4 rainfall days, and 20.98" (533mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in July is 14h and 34min.
On the first day of the month, sunrise is at 5:41 am and sunset at 8:31 pm. On the last day of July, sunrise is at 6:03 am and sunset at 8:14 pm CDT.

Sunshine

The months with the most sunshine are June and July, with an average of 10.5h of sunshine.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In July, the maximum UV index of 6 transforms into these recommendations:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the hottest?

In Saint Peters, July registers the highest temperatures, averaging 87.1°F (30.6°C) at the peak and 68.4°F (20.2°C) at the lowest.

How hot is July?

The average high-temperature and low-temperature in Saint Peters during July are 87.1°F (30.6°C) and 68.4°F (20.2°C) respectively. In July, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 102.2°F (39°C).

What is the average humidity in July?

In Saint Peters, the average relative humidity in July is 77%.

How much does it rain in July?

In Saint Peters, in July, it is raining for 15.3 days, with typically 2.32" (59mm) of accumulated precipitation.

When it does not snow?

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

What is the average length of the day in July?

In July, the average day length is 14h and 34min.

When are sunrise and sunset in July?

On the first day of July, sunrise is at 5:41 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:03 am and sunset at 8:14 pm CDT.

What are the months with the most sunshine?

June and July, with an average of 10.5h of sunshine, are months with the most sunshine.

How long on average sun shines in July?

In Saint Peters, the average sunshine duration in July is 10.5h.

What are the months with the highest UV index?

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

What is the UV index intensity in July?

In July, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from 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 July
Saint Peters, MO

Average temperature in July - Saint Peters, MO
  • Average high temperature in July: 87.1°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 July: 68.4°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).

Average pressure in July
Saint Peters, MO

Average pressure in July - Saint Peters, MO
  • Average pressure in July: 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).

Average wind speed in July
Saint Peters, MO

Average wind speed in July - Saint Peters, MO
  • Average wind speed in July: 5.5mph

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).

Average humidity in July
Saint Peters, MO

Average humidity in July - Saint Peters, MO
  • Average humidity in July: 77%

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

Average rainfall in July
Saint Peters, MO

Average rainfall in July - Saint Peters, MO
  • Average rainfall in July: 2.32"

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

Average rainfall days in July
Saint Peters, MO

Average rainfall days in July - Saint Peters, MO
  • Average rainfall days in July: 15.3 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).

Average snowfall in July
Saint Peters, MO

Average snowfall in July - Saint Peters, MO
  • Average snowfall in July: 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").

Average snowfall days in July
Saint Peters, MO

Average snowfall days in July - Saint Peters, MO
  • Average snowfall days in July: 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).

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

Average daylight in July / Average sunshine in July - Saint Peters, MO
  • Average daylight in July: 14h 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 July: 10h and 3min

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).

Average sunshine days in July
Saint Peters, MO

Average sunshine days in July - Saint Peters, MO
  • Average sunshine days in July: 12.7 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).

Average UV index in July
Saint Peters, MO

Average UV index in July - Saint Peters, MO
  • Average UV index in July: 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).

Average cloud cover in July
Saint Peters, MO

Average cloud cover in July - Saint Peters, MO
  • Average cloud cover in July: 28

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

Average visibility in July
Saint Peters, MO

Average visibility in July - Saint Peters, MO
  • Average visibility in July: 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).

Saint Peters, Missouri, USA

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