July weather forecast
Herculaneum, MO

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Weather in July

July in Herculaneum, Missouri, is a hot summer month, with an average temperature ranging between min 68.2°F (20.1°C) and max 88°F (31.1°C).

Temperature

July brings the highest temperatures, with an average high of 88°F (31.1°C) and an average low of 68.2°F (20.1°C).

Heat index

In July, the heat index is estimated at a blisteringly hot 104°F (40°C). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Note that heat index values are valued for light wind and location in the shade. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is found by incorporating humidity levels into the air temperature measurement. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

In Herculaneum, the average relative humidity in July is 76%.

Rainfall

In Herculaneum, in July, during 17.8 rainfall days, 3.11" (79mm) of precipitation is typically accumulated. In Herculaneum, Missouri, during the entire year, the rain falls for 155 days and collects up to 34.92" (887mm) of precipitation.

Snowfall

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

Daylight

In July, the average length of the day is 14h and 31min.
On the first day of the month, sunrise is at 5:42 am and sunset at 8:28 pm. On the last day of July, sunrise is at 6:03 am and sunset at 8:12 pm CDT.

Sunshine

June and July, with an average of 10.5h of sunshine, are months with the most 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 reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: An average UV index of 6 in July transforms into this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Updated: Jun 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the hottest?

The warmest period is July, when temperatures fluctuate between an average high of 88°F (31.1°C) and a low of 68.2°F (20.1°C).

How hot is July?

In Herculaneum, in July, the average high-temperature is 88°F (31.1°C), and the average low-temperature is 68.2°F (20.1°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in July is estimated at 104°F (40°C).

What is the average humidity in July?

The average relative humidity in July is 76%.

How much does it rain in July?

In July, the rain falls for 17.8 days. Throughout July, 3.11" (79mm) of precipitation is accumulated.

When it does not snow?

April through October are months without snowfall.

How many hours of daylight does Herculaneum have in July?

The average day length in July in Herculaneum is 14h and 31min.

What time are sunrise and sunset in July?

On the first day of July, sunrise is at 5:42 am and sunset at 8:28 pm. On the last day of the month, sunrise is at 6:03 am and sunset at 8:12 pm CDT.

What is the month with the most sunshine?

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

How many hours of sunshine does Herculaneum have in July?

The average sunshine duration in July is 10.5h.

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 July?

In July, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability 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 July
Herculaneum, MO

Average temperature in July - Herculaneum, MO
  • Average high temperature in July: 88°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (39°F).

  • Average low temperature in July: 68.2°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in July
Herculaneum, MO

Average pressure in July - Herculaneum, 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
Herculaneum, MO

Average wind speed in July - Herculaneum, MO
  • Average wind speed in July: 5.3mph

The windiest month (with the highest average wind speed) is January (9mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in July
Herculaneum, MO

Average humidity in July - Herculaneum, MO
  • Average humidity in July: 76%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (72%).

Average rainfall in July
Herculaneum, MO

Average rainfall in July - Herculaneum, MO
  • Average rainfall in July: 3.11"

The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is February (1.97").

Average rainfall days in July
Herculaneum, MO

Average rainfall days in July - Herculaneum, MO
  • Average rainfall days in July: 17.8 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.2 days).

Average snowfall in July
Herculaneum, MO

Average snowfall in July - Herculaneum, MO
  • Average snowfall in July: 0"

The month with the highest snowfall is January (2.36").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in July
Herculaneum, MO

Average snowfall days in July - Herculaneum, MO
  • 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 April, May, June, July, August and September (0 days).

Average daylight in July /
Average sunshine in July
Herculaneum, MO

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

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 36min).

  • 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 48min).

Average sunshine days in July
Herculaneum, MO

Average sunshine days in July - Herculaneum, MO
  • Average sunshine days in July: 10.7 days

The month with the most sunshine days is December (19.2 days).
The month with the least sunshine days is July (10.7 days).

Average UV index in July
Herculaneum, MO

Average UV index in July - Herculaneum, 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
Herculaneum, MO

Average cloud cover in July - Herculaneum, MO
  • Average cloud cover in July: 28

The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are June, July and August (Cloud cover 28).

Average visibility in July
Herculaneum, MO

Average visibility in July - Herculaneum, 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).

Herculaneum, Missouri, USA

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