August weather forecast
Dubuque, IA

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A small railway line in Dubuque, Iowa, set on a hilly and scenic greenery spot overlooking the brown buildings in the rest of the city
A small railway line in Dubuque, Iowa, set on a hilly and scenic greenery spot overlooking the brown buildings in the rest of the city

Weather in August

August maintains the warm summer conditions in Dubuque, with temperatures slightly falling from the July highs to 78.6°F (25.9°C). Due to the remaining heat and pleasant conditions, outdoor activities remain widespread and enjoyable. The city comes alive with a palette of vibrant colors, thanks to late blooming summer flowers. The decrease in humidity relative to July makes August comparatively comfortable. While the weather remains conducive for activities, the city itself exudes an aura of beauty, making it an inviting time to experience Dubuque.

Temperature

August's commencement in Dubuque is accompanied by an average high-temperature of a still moderately hot 78.6°F (25.9°C), diverging marginally from July's 79.7°F (26.5°C). Dubuque anticipates an average minimum temperature of 60.4°F (15.8°C) in the month of August.

Humidity

In August, the average relative humidity is 81%.

Rainfall

In Dubuque, in August, during 12.1 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, there are 135.3 rainfall days, and 27.4" (696mm) of precipitation is accumulated.

Snowfall

In Dubuque, snow does not fall in May through September.

Daylight

In Dubuque, Iowa, the average length of the day in August is 13h and 51min.
On the first day of the month, sunrise is at 5:55 am and sunset at 8:22 pm. On the last day of August, sunrise is at 6:27 am and sunset at 7:38 pm CDT.

Sunshine

July and August, with an average of 9.7h of sunshine, are months with the most sunshine.

UV index

The average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 5 in August interprets into the following advice:
Take necessary precautions - Defending against sun damage is advocated. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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Frequently asked questions

What are August temperatures in Dubuque?

Dubuque in August has an average high-temperature of 78.6°F (25.9°C) and an average low-temperature of 60.4°F (15.8°C).

What is the average humidity in August in Dubuque?

The average relative humidity in August is 81%.

How much does it rain in Dubuque in August?

In August, the rain falls for 12.1 days. Throughout August, 1.73" (44mm) of precipitation is accumulated.

When it does not snow in Dubuque?

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

How many hours of daylight does Dubuque have in August?

In August, the average day length in Dubuque, Iowa, is 13h and 51min.

What time are sunrise and sunset in August in Dubuque?

In August, on the first day of the month, sunrise is at 5:55 am and sunset at 8:22 pm. On the last day of the month, sunrise is at 6:27 am and sunset at 7:38 pm CDT.

What are the months with the most sunshine in Dubuque?

July and August, with an average of 9.7h of sunshine, are months with the most sunshine in Dubuque.

How long on average sun shines in August in Dubuque?

In Dubuque, the average sunshine duration in August is 9.7h.

What is the UV index intensity in August in Dubuque?

In Dubuque, the average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe 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
Dubuque, IA

Average temperature in August - Dubuque, IA
  • Average high temperature in August: 78.6°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 (25°F).

  • Average low temperature in August: 60.4°F

The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).

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Average pressure in August
Dubuque, IA

Average pressure in August - Dubuque, 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).

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Average wind speed in August
Dubuque, IA

Average wind speed in August - Dubuque, IA
  • Average wind speed in August: 6.8mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

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Average humidity in August
Dubuque, IA

Average humidity in August - Dubuque, IA
  • Average humidity in August: 81%

The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is October (76%).

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Average rainfall in August
Dubuque, IA

Average rainfall in August - Dubuque, IA
  • Average rainfall in August: 1.73"

The wettest months (with the highest rainfall) are May and June (3.7").
The driest months (with the least rainfall) are January and February (1.14").

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Average rainfall days in August
Dubuque, IA

Average rainfall days in August - Dubuque, IA
  • Average rainfall days in August: 12.1 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in August
Dubuque, IA

Average snowfall in August - Dubuque, IA
  • Average snowfall in August: 0"

The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in August
Dubuque, IA

Average snowfall days in August - Dubuque, IA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Dubuque, IA

Average daylight in August / Average sunshine in August - Dubuque, 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 6min).

  • Average sunshine in August: 9h and 4min

The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in August
Dubuque, IA

Average sunshine days in August - Dubuque, IA
  • Average sunshine days in August: 17.4 days

The months with the most sunshine days are November and December (17.5 days).
The month with the least sunshine days is June (10.3 days).

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Average UV index in August
Dubuque, IA

Average UV index in August - Dubuque, IA
  • Average UV index in August: 5

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in August
Dubuque, IA

Average cloud cover in August - Dubuque, IA
  • Average cloud cover in August: 32

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in August
Dubuque, IA

Average visibility in August - Dubuque, 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).

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Dubuque, Iowa, USA

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