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
River Forest greets August with an average high-temperature of a still warm 79.3°F (26.3°C), marking a slight deviation from the preceding month. Nighttime temperature in River Forest lowers to an average of 66.7°F (19.3°C) in August.Humidity
The average relative humidity in August is 74%.Rainfall
In August, the rain falls for 16.4 days. Throughout August, 3.5" (89mm) of precipitation is accumulated. In River Forest, during the entire year, the rain falls for 157.8 days and collects up to 33.7" (856mm) of precipitation.Snowfall
In River Forest, snow does not fall in June through September.Daylight
In River Forest, the average length of the day in August is 13h and 49min.On the first day of the month, sunrise is at 5:45 am and sunset at 8:09 pm. On the last day of August, sunrise is at 6:16 am and sunset at 7:25 pm CDT.
Sunshine
August has the most sunshine of the year, with an average of 10.6h of sunshine.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.Note: A maximum UV index of 6 in August translates into the following recommendations:
Inhibit overexposure. Warding off sun damage is of utmost importance. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
What are the temperatures in River Forest in August?
What is the average humidity in August in River Forest?
How much does it rain in River Forest in August?
When it does not snow in River Forest?
What is the average length of the day in August in River Forest?
When are sunrise and sunset in August in River Forest?
What month has the most sunshine in River Forest?
How many hours of sunshine does River Forest have in August?
When is the highest UV index in River Forest?
What is the UV index intensity in August in River Forest?
Average temperature in August
River Forest, IL
- Average high temperature in August: 79.3°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 (28.9°F).
- Average low temperature in August: 66.7°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 (19.4°F).
Average pressure in August
River Forest, IL
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in August
River Forest, IL
- Average wind speed in August: 7mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in August
River Forest, IL
- Average humidity in August: 74%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in August
River Forest, IL
- Average rainfall in August: 3.5"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is December (1.57").
Average rainfall days in August
River Forest, IL
- Average rainfall days in August: 16.4 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in August
River Forest, IL
- Average snowfall in August: 0"
The month with the highest snowfall is February (4.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
River Forest, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
River Forest, 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: 10h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in August
River Forest, IL
- Average sunshine days in August: 11.8 days
The month with the most sunshine days is December (16.7 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in August
River Forest, 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 and December (UV index 1).
Average cloud cover in August
River Forest, IL
- Average cloud cover in August: 27
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in August
River Forest, 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).
River Forest, Illinois, USA
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