August weather forecast
Herald, IL

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Weather in August

The last month of the summer, August, is also a moderately hot month in Herald, Illinois, with temperature in the range of an average low of 65.8°F (18.8°C) and an average high of 84.4°F (29.1°C).

Temperature

August's arrival brings an average high-temperature of a still moderately hot 84.4°F (29.1°C), demonstrating subtle variation from the preceding month. Herald temperatures generally rest at a low of 65.8°F (18.8°C) during the August nights.

Heat index

For August, the heat index is estimated at a torrid 95°F (35°C). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In Herald, the average relative humidity in August is 78%.

Rainfall

In Herald, in August, it is raining for 10.2 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, there are 100.2 rainfall days, and 8.7" (221mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Herald.

Daylight

The average length of the day in August is 13h and 35min.
On the first day of August in Herald, sunrise is at 5:56 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 7:23 pm CDT.

Sunshine

In August, the average sunshine is 10.5h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the average maximum UV index of 6 translates into the following recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Updated: Aug 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is August?

In Herald, 84.4°F (29.1°C) is the average high-temperature and 65.8°F (18.8°C) is the average low-temperature during August. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, in August is estimated at 95°F (35°C).

What is the average humidity in August in Herald?

In August, the average relative humidity is 78%.

How many days does it rain in August?

In Herald, in August, it is raining for 10.2 days, with typically 0.79" (20mm) of accumulated precipitation.

When it does not snow?

April through October are months without snowfall.

What is the average length of the day in August?

The average day length in August in Herald is 13h and 35min.

When is the sunrise / sunset in August in Herald?

On the first day of August, sunrise is at 5:56 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 7:23 pm CDT.

How many hours of sunshine does Herald have in August?

In August, the average sunshine duration is 10.5h.

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 August?

In Herald, Illinois, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to 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
Herald, IL

Average temperature in August - Herald, IL
  • Average high temperature in August: 84.4°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in August: 65.8°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 (26.1°F).

Average pressure in August
Herald, IL

Average pressure in August - Herald, IL
  • 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 (29.94"Hg).

Average wind speed in August
Herald, IL

Average wind speed in August - Herald, IL
  • Average wind speed in August: 6mph

The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

Average humidity in August
Herald, IL

Average humidity in August - Herald, IL
  • Average humidity in August: 78%

The months with the highest relative humidity are May and July (79%).
The month with the lowest relative humidity is October (69%).

Average rainfall in August
Herald, IL

Average rainfall in August - Herald, IL
  • Average rainfall in August: 0.79"

The wettest month (with the highest rainfall) is April (1.06").
The driest month (with the least rainfall) is September (0.28").

Average rainfall days in August
Herald, IL

Average rainfall days in August - Herald, IL
  • Average rainfall days in August: 10.2 days

The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is January (5 days).

Average snowfall in August
Herald, IL

Average snowfall in August - Herald, IL
  • Average snowfall in August: 0"

The months with the highest snowfall are January and February (0.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in August
Herald, IL

Average snowfall days in August - Herald, IL
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in August /
Average sunshine in August
Herald, IL

Average daylight in August / Average sunshine in August - Herald, IL
  • 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 36min).

  • Average sunshine in August: 10h and 3min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in August
Herald, IL

Average sunshine days in August - Herald, IL
  • Average sunshine days in August: 17.8 days

The month with the most sunshine days is October (23.4 days).
The month with the least sunshine days is May (15.8 days).

Average UV index in August
Herald, IL

Average UV index in August - Herald, IL
  • 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).

Average cloud cover in August
Herald, IL

Average cloud cover in August - Herald, IL
  • Average cloud cover in August: 27

The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 27).

Average visibility in August
Herald, IL

Average visibility in August - Herald, IL
  • 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).

Herald, Illinois, USA

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