August weather forecast
Dorchester, IL

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Weather in August

August, the last month of the summer in Dorchester, is also a moderately hot month, with temperature in the range of an average low of 65.5°F (18.6°C) and an average high of 82.9°F (28.3°C).

Temperature

The average high-temperature for August is a still warm 82.9°F (28.3°C), closely aligning with the temperature of the preceding month. The average low-temperature of 65.5°F (18.6°C) is witnessed in Dorchester during August.

Heat index

The heat index value during August is estimated at a tropical 91.4°F (33°C). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', gives a temperature feeling by integrating air temperature and humidity. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.

Humidity

In Dorchester, the average relative humidity in August is 80%.

Rainfall

In Dorchester, during August, the rain falls for 12.1 days and regularly aggregates up to 1.57" (40mm) of precipitation. In Dorchester, during the entire year, the rain falls for 121.4 days and collects up to 14.72" (374mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In Dorchester, the average length of the day in August is 13h and 39min.
On the first day of August in Dorchester, sunrise is at 6:00 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:28 am and sunset at 7:31 pm CDT.

Sunshine

In August, the average sunshine in Dorchester is 9.9h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 6 during August translates into the following guidance:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot in Dorchester during August?

Dorchester in August has an average high-temperature of 82.9°F (28.3°C) and an average low-temperature of 65.5°F (18.6°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in August is estimated at 91.4°F (33°C).

What is the average humidity in August in Dorchester?

In Dorchester, the average relative humidity in August is 80%.

How much does it rain in Dorchester in August?

In Dorchester, in August, it is raining for 12.1 days, with typically 1.57" (40mm) of accumulated precipitation.

When it does not snow in Dorchester?

April through October are months without snowfall.

What is the average length of the day in August in Dorchester?

In Dorchester, the average day length in August is 13h and 39min.

When are sunrise and sunset in August in Dorchester?

On the first day of August in Dorchester, sunrise is at 6:00 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:28 am and sunset at 7:31 pm CDT.

How long on average sun shines in August in Dorchester?

The average sunshine duration in August in Dorchester is 9.9h.

What is the month with the highest UV index in Dorchester?

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

How high is the UV index in August in Dorchester?

In Dorchester, Illinois, the average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability 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
Dorchester, IL

Average temperature in August - Dorchester, IL
  • Average high temperature in August: 82.9°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in August: 65.5°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

Average pressure in August
Dorchester, IL

Average pressure in August - Dorchester, 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 (29.92"Hg).

Average wind speed in August
Dorchester, IL

Average wind speed in August - Dorchester, IL
  • Average wind speed in August: 5.9mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).

Average humidity in August
Dorchester, IL

Average humidity in August - Dorchester, IL
  • Average humidity in August: 80%

The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in August
Dorchester, IL

Average rainfall in August - Dorchester, IL
  • Average rainfall in August: 1.57"

The wettest month (with the highest rainfall) is June (1.89").
The driest month (with the least rainfall) is February (0.67").

Average rainfall days in August
Dorchester, IL

Average rainfall days in August - Dorchester, IL
  • Average rainfall days in August: 12.1 days

The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is January (5.8 days).

Average snowfall in August
Dorchester, IL

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

The month with the highest snowfall is December (0.98").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in August
Dorchester, IL

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

The month with the highest number of snowfall days is January (6.3 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
Dorchester, IL

Average daylight in August / Average sunshine in August - Dorchester, IL
  • Average daylight in August: 13h 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 August: 9h and 5min

The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in August
Dorchester, IL

Average sunshine days in August - Dorchester, IL
  • Average sunshine days in August: 15.3 days

The month with the most sunshine days is January (20.9 days).
The month with the least sunshine days is July (12.5 days).

Average UV index in August
Dorchester, IL

Average UV index in August - Dorchester, IL
  • Average UV index in August: 6

The months with the highest UV index are 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
Dorchester, IL

Average cloud cover in August - Dorchester, IL
  • Average cloud cover in August: 29

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).

Average visibility in August
Dorchester, IL

Average visibility in August - Dorchester, 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).

Dorchester, Illinois, USA

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