August weather forecastForreston, IL
August
Weather in August
August, the last month of the summer in Forreston, is also a moderately hot month, with an average temperature ranging between max 78.4°F (25.8°C) and min 61°F (16.1°C).Temperature
Forreston, Illinois, records a slight change with August's average high-temperatures adjusting to a still warm 78.4°F (25.8°C) from July's 79.7°F (26.5°C). August is noted for a mean low-temperature of 61°F (16.1°C).Humidity
In August, the average relative humidity in Forreston is 84%.Rainfall
In Forreston, Illinois, in August, during 15.3 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. In Forreston, during the entire year, the rain falls for 145.6 days and collects up to 23.43" (595mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Forreston, the average length of the day in August is 13h and 50min.On the first day of the month, sunrise is at 5:52 am and sunset at 8:16 pm. On the last day of August, sunrise is at 6:23 am and sunset at 7:33 pm CDT.
Sunshine
The average sunshine in August in Forreston is 9.5h.UV index
The months with the highest UV index in Forreston are May through August, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 5 in August translates into this advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Forreston, IL
- Average high temperature in August: 78.4°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in August: 61°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in August
Forreston, 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
Forreston, IL
- Average wind speed in August: 6.5mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in August
Forreston, IL
- Average humidity in August: 84%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in August
Forreston, IL
- Average rainfall in August: 2.01"
The wettest month (with the highest rainfall) is June (3.39").
The driest months (with the least rainfall) are February and December (1.06").
Average rainfall days in August
Forreston, IL
- Average rainfall days in August: 15.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (5 days).
Average snowfall in August
Forreston, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (3.54").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Forreston, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (12.4 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
Forreston, IL
- Average daylight in August: 13h and 48min
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 30min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in August
Forreston, IL
- Average sunshine days in August: 12.9 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (9.7 days).
Average UV index in August
Forreston, IL
- Average UV index in August: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in August
Forreston, IL
- Average cloud cover in August: 34
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in August
Forreston, IL
- Average visibility in August: 5mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
