Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
In August, Lanark experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 79.9°F (26.6°C) in July to a still moderately hot 78.4°F (25.8°C). In August, the nighttime temperature lowers to an average of 60.8°F (16°C).Humidity
In Lanark, Illinois, the average relative humidity in August is 83%.Rainfall
In August, the rain falls for 12.3 days. Throughout August, 1.22" (31mm) of precipitation is accumulated. Throughout the year, there are 130.8 rainfall days, and 17.95" (456mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In August, the average length of the day is 13h and 50min.On the first day of the month, sunrise is at 5:53 am and sunset at 8:17 pm. On the last day of August, sunrise is at 6:24 am and sunset at 7:34 pm CDT.
Sunshine
The average sunshine in August is 9.7h.UV index
In August, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 5 in August translates into this advice:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in August?
What is the average humidity in August?
How many days does it rain in August?
When it does not snow?
What is the average length of the day in August?
When is the sunrise / sunset in August?
How long on average sun shines in August?
What is the UV index intensity in August?
Average temperature in August
Lanark, IL
- Average high temperature in August: 78.4°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (25.9°F).
- Average low temperature in August: 60.8°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in August
Lanark, IL
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in August
Lanark, IL
- Average wind speed in August: 6.5mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in August
Lanark, IL
- Average humidity in August: 83%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (75%).
Average rainfall in August
Lanark, IL
- Average rainfall in August: 1.22"
The wettest month (with the highest rainfall) is May (2.76").
The driest months (with the least rainfall) are January and February (0.71").
Average rainfall days in August
Lanark, IL
- Average rainfall days in August: 12.3 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (4.4 days).
Average snowfall in August
Lanark, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (2.64").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Lanark, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (11.2 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
Lanark, IL
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 9h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in August
Lanark, IL
- Average sunshine days in August: 16.6 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (10 days).
Average UV index in August
Lanark, IL
- Average UV index in August: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in August
Lanark, IL
- Average cloud cover in August: 33
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in August
Lanark, IL
- Average visibility in August: 5mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Lanark, Illinois, USA
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