August weather forecast
Downers Grove, IA

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Weather in August

August, the last month of the summer in Downers Grove, is another warm month, with an average temperature ranging between min 60.6°F (15.9°C) and max 78.6°F (25.9°C).

Temperature

In the transition from July to August, Downers Grove reports an average high-temperature of a still warm 78.6°F (25.9°C), indicating a close resemblance to the prior month. In Downers Grove, in August, the average low-temperature is a mild 60.6°F (15.9°C).

Humidity

In August, the average relative humidity is 81%.

Rainfall

In Downers Grove, in August, it is raining for 12.5 days, with typically 1.77" (45mm) of accumulated precipitation. In Downers Grove, during the entire year, the rain falls for 142.5 days and collects up to 28.27" (718mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

The average length of the day in August is 13h and 50min.
On the first day of the month, sunrise is at 5:58 am and sunset at 8:24 pm. On the last day of August, sunrise is at 6:30 am and sunset at 7:40 pm CDT.

Sunshine

The months with the most sunshine are July and August, with an average of 9.9h of sunshine.

UV index

The average daily maximum UV index in August is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 5 during August translates into the following directions:
Ensure safety - Imperative it is to shield skin and eyes from damage. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are August temperatures?

In August, the average high-temperature and low-temperature are 78.6°F (25.9°C) and 60.6°F (15.9°C) respectively.

What is the average humidity in August?

In Downers Grove, the average relative humidity in August is 81%.

How much does it rain in August?

In Downers Grove, in August, it is raining for 12.5 days, with typically 1.77" (45mm) of accumulated precipitation.

When it does not snow?

In Downers Grove, Iowa, snow does not fall in May through September.

How many hours of daylight does Downers Grove have in August?

The average day length in August is 13h and 50min.

When are sunrise and sunset in August in Downers Grove?

In August, on the first day of the month, sunrise is at 5:58 am and sunset at 8:24 pm. On the last day of the month, in Downers Grove, sunrise is at 6:30 am and sunset at 7:40 pm CDT.

What are the months with the most sunshine?

July and August, with an average of 9.9h of sunshine, are months with the most sunshine.

How long on average sun shines in August?

The average sunshine duration in August is 9.9h.

What is the UV index intensity in August?

In August, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's 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
Downers Grove, IA

Average temperature in August - Downers Grove, IA
  • Average high temperature in August: 78.6°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25.2°F).

  • Average low temperature in August: 60.6°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 (13.3°F).

Average pressure in August
Downers Grove, IA

Average pressure in August - Downers Grove, IA
  • Average pressure in August: 29.97"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in August
Downers Grove, IA

Average wind speed in August - Downers Grove, IA
  • Average wind speed in August: 6.9mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

Average humidity in August
Downers Grove, IA

Average humidity in August - Downers Grove, IA
  • Average humidity in August: 81%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is October (74%).

Average rainfall in August
Downers Grove, IA

Average rainfall in August - Downers Grove, IA
  • Average rainfall in August: 1.77"

The wettest month (with the highest rainfall) is May (4.25").
The driest months (with the least rainfall) are January and February (1.26").

Average rainfall days in August
Downers Grove, IA

Average rainfall days in August - Downers Grove, IA
  • Average rainfall days in August: 12.5 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in August
Downers Grove, IA

Average snowfall in August - Downers Grove, IA
  • Average snowfall in August: 0"

The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in August
Downers Grove, IA

Average snowfall days in August - Downers Grove, IA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (12.1 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
Downers Grove, IA

Average daylight in August / Average sunshine in August - Downers Grove, IA
  • 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 5min

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

Average sunshine days in August
Downers Grove, IA

Average sunshine days in August - Downers Grove, IA
  • Average sunshine days in August: 16.7 days

The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in August
Downers Grove, IA

Average UV index in August - Downers Grove, IA
  • Average UV index in August: 5

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in August
Downers Grove, IA

Average cloud cover in August - Downers Grove, IA
  • Average cloud cover in August: 30

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in August
Downers Grove, IA

Average visibility in August - Downers Grove, IA
  • Average visibility in August: 6mi

The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).

Downers Grove, Iowa, USA

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