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

As Dubuque welcomes August, the average high-temperature stabilizes at a still moderately hot 78.6°F (25.9°C), showing little deviation from July's 79.7°F (26.5°C). During August, the average low-temperature is recorded at a mild 60.4°F (15.8°C).

Humidity

The average relative humidity in August is 81%.

Rainfall

In Dubuque, in August, during 12.1 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. In Dubuque, during the entire year, the rain falls for 135.3 days and collects up to 27.4" (696mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

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

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

UV index

In August, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In August, the maximum UV index of 5 suggests these recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.

Frequently asked questions

What is the usual temperature for Dubuque in August?

During August, Dubuque experiences an average high-temperature of 78.6°F (25.9°C) and a 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 many days does it rain in August?

In Dubuque, in August, it is raining for 12.1 days, with typically 1.73" (44mm) of accumulated precipitation.

When it does not snow?

May through September are months without snowfall.

What is the average length of the day in August in Dubuque?

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

When is the sunrise / sunset in August?

On the first day of August, 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 is the month with the most sunshine?

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

How many hours of sunshine does Dubuque have in August?

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

What is the UV index intensity in August?

The average daily maximum UV index in August is 5. A UV Index of 3 to 5 symbolizes a moderate 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
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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Dubuque, Iowa, USA

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