August weather forecast
Grantsburg, IL

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Weather in August

The last month of the summer, August, is another tropical month in Grantsburg, Illinois, with an average temperature fluctuating between 86.5°F (30.3°C) and 66.7°F (19.3°C).

Temperature

August's advent presents an average high-temperature of a still hot 86.5°F (30.3°C), indicating a slight variation from the conditions of the previous month. In the month of August, the average low-temperature usually rests at an enjoyable 66.7°F (19.3°C).

Heat index

August's heat index is estimated at a torrid 98.6°F (37°C). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

In August, the average relative humidity is 76%.

Rainfall

In Grantsburg, in August, during 11.9 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Grantsburg, during the entire year, the rain falls for 118.3 days and collects up to 13.03" (331mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In Grantsburg, the average length of the day in August is 13h and 34min.
On the first day of August, sunrise is at 6:00 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 7:24 pm CDT.

Sunshine

In Grantsburg, the average sunshine in August is 10.3h.

UV index

The months with the highest UV index in Grantsburg are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In August, the maximum UV index of 6 translates into these guidelines:
Resist extreme sun exposure. Guarding against solar damage is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Jun 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is August?

In Grantsburg, in August, the average high-temperature is 86.5°F (30.3°C), and the average low-temperature is 66.7°F (19.3°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is estimated at 98.6°F (37°C).

What is the average humidity in August?

In August, the average relative humidity is 76%.

How much does it rain in August?

In Grantsburg, in August, during 11.9 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

When it does not snow?

April through October are months without snowfall.

How many hours of daylight does Grantsburg have in August?

In August, the average day length is 13h and 34min.

When is the sunrise / sunset in August?

In August, on the first day of the month, sunrise is at 6:00 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 7:24 pm CDT.

How long on average sun shines in August?

The average sunshine duration in August is 10.3h.

When is the highest UV index?

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

How high is the UV index in August?

In August, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health risk 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 August
Grantsburg, IL

Average temperature in August - Grantsburg, IL
  • Average high temperature in August: 86.5°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in August: 66.7°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (27°F).

Average pressure in August
Grantsburg, IL

Average pressure in August - Grantsburg, 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
Grantsburg, IL

Average wind speed in August - Grantsburg, IL
  • Average wind speed in August: 5.7mph

The windiest months (with the highest average wind speed) are January and February (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in August
Grantsburg, IL

Average humidity in August - Grantsburg, IL
  • Average humidity in August: 76%

The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in August
Grantsburg, IL

Average rainfall in August - Grantsburg, IL
  • Average rainfall in August: 1.3"

The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is September (0.47").

Average rainfall days in August
Grantsburg, IL

Average rainfall days in August - Grantsburg, IL
  • Average rainfall days in August: 11.9 days

The month with the highest number of rainy days is July (13.1 days).
The months with the least rainy days are January, February and December (7.3 days).

Average snowfall in August
Grantsburg, IL

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

The month with the highest snowfall is February (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in August
Grantsburg, IL

Average snowfall days in August - Grantsburg, 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 and September (0 days).

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

Average daylight in August / Average sunshine in August - Grantsburg, IL
  • Average daylight in August: 13h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in August: 10h and 2min

The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in August
Grantsburg, IL

Average sunshine days in August - Grantsburg, IL
  • Average sunshine days in August: 16.3 days

The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is June (14.8 days).

Average UV index in August
Grantsburg, IL

Average UV index in August - Grantsburg, 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 and December (UV index 2).

Average cloud cover in August
Grantsburg, IL

Average cloud cover in August - Grantsburg, IL
  • Average cloud cover in August: 30

The months with the most cloud cover are January and February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).

Average visibility in August
Grantsburg, IL

Average visibility in August - Grantsburg, 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).

Grantsburg, Illinois, USA

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