July weather forecast
Saint Louis, VA

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Weather in July

July is a tropical summer month in Saint Louis, Virginia, with an average temperature ranging between min 65.5°F (18.6°C) and max 86.5°F (30.3°C).

Temperature

Saint Louis's July weather, marked by an average high temperature of 86.5°F (30.3°C) and an average low temperature of 65.5°F (18.6°C), is the warmest in the year.

Heat index

The heat index value during July is computed to be a sweltering 98.6°F (37°C). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a value derived by merging air temperature with the humidity to convey how the climate feels. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

July is the least humid month, with an average relative humidity of 73%.

Rainfall

In Saint Louis, in July, during 16.8 rainfall days, 2.99" (76mm) of precipitation is typically accumulated. Throughout the year, there are 162.2 rainfall days, and 31.1" (790mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In Saint Louis, the average length of the day in July is 14h and 35min.
On the first day of July, sunrise is at 5:49 am and sunset at 8:40 pm. On the last day of the month, sunrise is at 6:11 am and sunset at 8:23 pm EDT.

Sunshine

July has the most sunshine of the year, with an average of 10.8h of sunshine.

UV index

The months with the highest UV index in Saint Louis are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index, 6 during July, leads to the following recommendations:
Ward off overexposure. Defence against solar harm is crucial. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Jul 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the hottest?

July proves to be the warmest month, recording an average peak temperature of 86.5°F (30.3°C) and a minimum temperature of 65.5°F (18.6°C).

How hot does it get in Saint Louis in July?

The high-temperature during July is 86.5°F (30.3°C) and the low-temperature is 65.5°F (18.6°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in July is computed to be 98.6°F (37°C).

What is the least humid month?

The least humid month in Saint Louis is July, with an average relative humidity of 73%.

What is the average humidity in July?

In Saint Louis, the average relative humidity in July is 73%.

How much does it rain in July?

In Saint Louis, in July, during 16.8 rainfall days, 2.99" (76mm) of precipitation is typically accumulated.

When it does not snow?

In Saint Louis, snow does not fall in May through September.

What is the average length of the day in July?

In July, the average day length is 14h and 35min.

When is the sunrise / sunset in July?

On the first day of July, sunrise is at 5:49 am and sunset at 8:40 pm. On the last day of the month, sunrise is at 6:11 am and sunset at 8:23 pm EDT.

What month has the most sunshine?

With an average of 10.8h of sunshine, July has the most sunshine of the year.

How long on average sun shines in July?

In Saint Louis, the average sunshine duration in July is 10.8h.

What is the month 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 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 Louis, VA

Average temperature in July - Saint Louis, VA
  • Average high temperature in July: 86.5°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in July: 65.5°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in July
Saint Louis, VA

Average pressure in July - Saint Louis, VA
  • Average pressure in July: 29.97"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in July
Saint Louis, VA

Average wind speed in July - Saint Louis, VA
  • Average wind speed in July: 4.5mph

The windiest month (with the highest average wind speed) is March (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).

Average humidity in July
Saint Louis, VA

Average humidity in July - Saint Louis, VA
  • Average humidity in July: 73%

The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (73%).

Average rainfall in July
Saint Louis, VA

Average rainfall in July - Saint Louis, VA
  • Average rainfall in July: 2.99"

The wettest months (with the highest rainfall) are May and August (3.35").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in July
Saint Louis, VA

Average rainfall days in July - Saint Louis, VA
  • Average rainfall days in July: 16.8 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (10.1 days).

Average snowfall in July
Saint Louis, VA

Average snowfall in July - Saint Louis, VA
  • Average snowfall in July: 0"

The month with the highest snowfall is January (4.17").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in July
Saint Louis, VA

Average snowfall days in July - Saint Louis, VA
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (6.8 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 Louis, VA

Average daylight in July / Average sunshine in July - Saint Louis, VA
  • Average daylight in July: 14h and 4min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in July: 10h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 6min).

Average sunshine days in July
Saint Louis, VA

Average sunshine days in July - Saint Louis, VA
  • Average sunshine days in July: 11.8 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (11.1 days).

Average UV index in July
Saint Louis, VA

Average UV index in July - Saint Louis, VA
  • 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 Louis, VA

Average cloud cover in July - Saint Louis, VA
  • Average cloud cover in July: 30

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in July
Saint Louis, VA

Average visibility in July - Saint Louis, VA
  • Average visibility in July: 6mi

The months with the highest visibility are February, March, April, June, July, August and November (6mi).
The months with the lowest visibility are January, May, September, October and December (5mi).

Saint Louis, Virginia, USA

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