August weather forecast
Detroit, MI

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The downtown city of Detroit, Michigan viewed from a bird
The downtown city of Detroit, Michigan viewed from a bird's eye angle

Weather in August

August experiences a slight drop in temperature from July, although it remains within the summer range at 78.4°F (25.8°C). The minor reduction in heat provides a small reprieve from the sweltering July weather. Cloud cover starts to increase slightly, offering more shade and relief from the still-intense sun. August is a month to enjoy the remaining days of summer, from backyard barbecues with neighbors to strolls along the Detroit Riverwalk. While storms are more likely as the month progresses, they bring a refreshing change from the typical summer heat.

Temperature

At the start of August, Detroit's average high-temperature reaches a still warm 78.4°F (25.8°C), subtly different from the preceding month. Detroit experiences a mean temperature of 64.9°F (18.3°C) during August nights.

Humidity

The months with the lowest humidity are July and August, with an average relative humidity of 73%.

Rainfall

In August, the rain falls for 15.2 days. Throughout August, 2.44" (62mm) of precipitation is accumulated. In Detroit, during the entire year, the rain falls for 152.1 days and collects up to 23.43" (595mm) of precipitation.

Snowfall

June through September are months without snowfall.

Ocean temperature

August is the month with the warmest seawater, with an average ocean temperature of 75.4°F (24.1°C).
Note: For someone not comfortable with cold, swimming in 75.4°F (24.1°C) waters might be a stretch. However, with favorable conditions like abundant sunshine, mild wind, and warm air temperatures, the experience can be improved. And while wetsuits are not a must, they can be considered.

Daylight

The average length of the day in August is 13h and 50min.
On the first day of August, sunrise is at 6:25 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 8:07 pm EDT.

Sunshine

In August, the average sunshine in Detroit is 10.5h.

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 exposure to the Sun's UV rays for the average person.
Note: In August, the maximum UV index of 6 suggests this advice:
Inhibit overexposure. Warding off sun damage is of utmost importance. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be mindful! Sand and water reflections can up the Sun's UV exposure.

Frequently asked questions

What are the temperatures in August?

Detroit in August has an average high-temperature of 78.4°F (25.8°C) and an average low-temperature of 64.9°F (18.3°C).

What is the least humid month?

The months with the lowest humidity are July and August, with an average relative humidity of 73%.

What is the average humidity in August?

In August, the average relative humidity in Detroit is 73%.

How many days does it rain in August?

In Detroit, during August, the rain falls for 15.2 days and regularly aggregates up to 2.44" (62mm) of precipitation.

When it does not snow?

June through September are months without snowfall.

What month is the ocean warmest?

With an average ocean temperature of 75.4°F (24.1°C), August is the month with the warmest seawater in Detroit.

What is the water temperature in August?

In August, the average ocean temperature is 75.4°F (24.1°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 75.4°F (24.1°C) water may be enjoyable.

How many hours of daylight does Detroit have in August?

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

When are sunrise and sunset in August in Detroit?

In August, on the first day of the month, sunrise is at 6:25 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 8:07 pm EDT.

How many hours of sunshine does Detroit have in August?

The average sunshine duration in August is 10.5h.

What are the months with the highest UV index?

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

What is the UV index reading in August?

The average daily maximum UV index in August is 6. A UV Index estimate of 6 to 7 represents 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
Detroit, MI

Average temperature in August - Detroit, MI
  • Average high temperature in August: 78.4°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in August: 64.9°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

Average pressure in August
Detroit, MI

Average pressure in August - Detroit, MI
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in August
Detroit, MI

Average wind speed in August - Detroit, MI
  • Average wind speed in August: 7.1mph

The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).

Average humidity in August
Detroit, MI

Average humidity in August - Detroit, MI
  • Average humidity in August: 73%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (73%).

Average rainfall in August
Detroit, MI

Average rainfall in August - Detroit, MI
  • Average rainfall in August: 2.44"

The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is February (1.22").

Average rainfall days in August
Detroit, MI

Average rainfall days in August - Detroit, MI
  • Average rainfall days in August: 15.2 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7.1 days).

Average snowfall in August
Detroit, MI

Average snowfall in August - Detroit, MI
  • Average snowfall in August: 0"

The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in August
Detroit, MI

Average snowfall days in August - Detroit, MI
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (14.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in August
Detroit, MI

Average sea temperature in August - Detroit, MI
  • Average sea temperature in August: 75.4°F

The best month for swimming (with the highest average sea temperature) is August (75.4°F).
The coldest month (with the lowest average sea temperature) is February (32.7°F).

Average daylight in August /
Average sunshine in August
Detroit, MI

Average daylight in August / Average sunshine in August - Detroit, MI
  • 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: 10h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).

Average sunshine days in August
Detroit, MI

Average sunshine days in August - Detroit, MI
  • Average sunshine days in August: 13 days

The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is February (10.7 days).

Average UV index in August
Detroit, MI

Average UV index in August - Detroit, MI
  • Average UV index in August: 6

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

Average cloud cover in August
Detroit, MI

Average cloud cover in August - Detroit, MI
  • Average cloud cover in August: 28

The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 27).

Average visibility in August
Detroit, MI

Average visibility in August - Detroit, MI
  • Average visibility in August: 6mi

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

Detroit, Michigan, USA

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