August weather forecast
Spring Valley, IL

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Weather in August

The last month of the summer, August, is also a moderately hot month in Spring Valley, Illinois, with temperature in the range of an average low of 61.9°F (16.6°C) and an average high of 79.7°F (26.5°C).

Temperature

The start of August sees the average high-temperature at a still moderately hot 79.7°F (26.5°C), showing little difference from July's 80.8°F (27.1°C). In August, the temperature in Spring Valley drops to an average of 61.9°F (16.6°C) at night.

Humidity

In August, the average relative humidity in Spring Valley is 83%.

Rainfall

In August, the rain falls for 13.9 days. Throughout August, 2.2" (56mm) of precipitation is accumulated. Throughout the year, in Spring Valley, Illinois, there are 152.7 rainfall days, and 30.79" (782mm) of precipitation is accumulated.

Snowfall

In Spring Valley, snow does not fall in May through September.

Daylight

The average length of the day in August is 13h and 47min.
On the first day of the month, sunrise is at 5:52 am and sunset at 8:13 pm. On the last day of August, sunrise is at 6:22 am and sunset at 7:30 pm CDT.

Sunshine

The months with the most sunshine are June through August, with an average of 9.8h 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 risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 6 during August leads to these advisories:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
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Frequently asked questions

What is the average August temperature in Spring Valley?

In August, in Spring Valley, the average high-temperature is 79.7°F (26.5°C), and the average low-temperature is 61.9°F (16.6°C). In July, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, is computed to be 86°F (30°C).

What is the average humidity in August in Spring Valley?

In August, the average relative humidity in Spring Valley is 83%.

How many days does it rain in August in Spring Valley?

In Spring Valley, during August, the rain falls for 13.9 days and regularly aggregates up to 2.2" (56mm) of precipitation.

When it does not snow in Spring Valley?

May through September are months without snowfall in Spring Valley.

How many hours of daylight does Spring Valley have in August?

The average day length in August in Spring Valley is 13h and 47min.

When is the sunrise / sunset in August in Spring Valley?

On the first day of August in Spring Valley, sunrise is at 5:52 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 7:30 pm CDT.

What is the month with the most sunshine in Spring Valley?

June through August, with an average of 9.8h of sunshine, are months with the most sunshine in Spring Valley.

How many hours of sunshine does Spring Valley have in August?

In Spring Valley, Illinois, the average sunshine duration in August is 9.8h.

When is the highest UV index in Spring Valley?

June through August, with an average maximum UV index of 6, are months with the highest UV index in Spring Valley, Illinois.

What is the UV index intensity in August in Spring Valley?

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

Average temperature in August - Spring Valley, IL
  • Average high temperature in August: 79.7°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (28.9°F).

  • Average low temperature in August: 61.9°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

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Average pressure in August
Spring Valley, IL

Average pressure in August - Spring Valley, IL
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in August
Spring Valley, IL

Average wind speed in August - Spring Valley, IL
  • Average wind speed in August: 6.3mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

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Average humidity in August
Spring Valley, IL

Average humidity in August - Spring Valley, IL
  • Average humidity in August: 83%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in August
Spring Valley, IL

Average rainfall in August - Spring Valley, IL
  • Average rainfall in August: 2.2"

The wettest month (with the highest rainfall) is May (4.69").
The driest months (with the least rainfall) are January and December (1.61").

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Average rainfall days in August
Spring Valley, IL

Average rainfall days in August - Spring Valley, IL
  • Average rainfall days in August: 13.9 days

The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is January (5.9 days).

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Average snowfall in August
Spring Valley, IL

Average snowfall in August - Spring Valley, IL
  • Average snowfall in August: 0"

The month with the highest snowfall is January (4.09").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in August
Spring Valley, IL

Average snowfall days in August - Spring Valley, IL
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are May, June, July and August (0 days).

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Average daylight in August /
Average sunshine in August
Spring Valley, IL

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

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in August: 9h and 5min

The months with the most sunshine are June, July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

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Average sunshine days in August
Spring Valley, IL

Average sunshine days in August - Spring Valley, IL
  • Average sunshine days in August: 14.8 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is April (10.2 days).

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Average UV index in August
Spring Valley, IL

Average UV index in August - Spring Valley, 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).

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Average cloud cover in August
Spring Valley, IL

Average cloud cover in August - Spring Valley, IL
  • Average cloud cover in August: 32

The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 32).

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Average visibility in August
Spring Valley, IL

Average visibility in August - Spring Valley, 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).

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Spring Valley, Illinois, USA

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