August weather forecast
Grand Rapids, MI

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The vast cityscape of Grand Rapids, a moderately large town in Michigan and two visible bridges across the river
The vast cityscape of Grand Rapids, a moderately large town in Michigan and two visible bridges across the river

Weather in August

August carries forward the warm summer temperatures in Grand Rapids. However, the slight decline from the peak heat in July provides a more comfortable summer experience. Plenty of sunshine continues to grace the city, with an average of 9.8 sunshine hours daily. Evenings in August are balmy, perfect for lakeside excursions or leisurely walks along the tree-lined streets. Soon, this warmth will slowly fade with the approach of autumn, making the August warmth something to savor.

Temperature

The advent of August in Grand Rapids observes an average high-temperature of a still moderately hot 78.6°F (25.9°C), nearly identical to July's 79.7°F (26.5°C). Throughout the nights in August, Grand Rapids experiences an average low-temperature of 60.4°F (15.8°C).

Humidity

The average relative humidity in August in Grand Rapids is 78%.

Rainfall

In Grand Rapids, in August, during 9.9 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, in Grand Rapids, there are 103.5 rainfall days, and 9.02" (229mm) of precipitation is accumulated.

Snowfall

In Grand Rapids, Michigan, snow does not fall in May through October.

Daylight

In August, the average length of the day is 13h and 53min.
On the first day of August, sunrise is at 6:34 am and sunset at 9:03 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 8:18 pm EDT.

Sunshine

The average sunshine in August is 9.8h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In August, a daily maximum UV index of 6 leads to the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.

Frequently asked questions

What are the temperatures in Grand Rapids in August?

In Grand Rapids, in August, the average high-temperature is 78.6°F (25.9°C), and the average low-temperature is 60.4°F (15.8°C).

What is the average humidity in August in Grand Rapids?

The average relative humidity in August is 78%.

How much does it rain in Grand Rapids in August?

In Grand Rapids, in August, during 9.9 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

When it does not snow in Grand Rapids?

May through October are months without snowfall in Grand Rapids, Michigan.

What is the average length of the day in August in Grand Rapids?

In August, the average day length in Grand Rapids, Michigan, is 13h and 53min.

When is the sunrise / sunset in August in Grand Rapids?

In August, on the first day of the month, sunrise is at 6:34 am and sunset at 9:03 pm. On the last day of the month, in Grand Rapids, sunrise is at 7:06 am and sunset at 8:18 pm EDT.

How long on average sun shines in August in Grand Rapids?

In Grand Rapids, Michigan, the average sunshine duration in August is 9.8h.

What are the months with the highest UV index in Grand Rapids?

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

What is the UV index reading in August in Grand Rapids?

The average daily maximum UV index in August in Grand Rapids is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to 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
Grand Rapids, MI

Average temperature in August - Grand Rapids, MI
  • 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 (27.7°F).

  • Average low temperature in August: 60.4°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

Average pressure in August
Grand Rapids, MI

Average pressure in August - Grand Rapids, MI
  • Average pressure in August: 29.97"Hg

The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in August
Grand Rapids, MI

Average wind speed in August - Grand Rapids, MI
  • Average wind speed in August: 6.6mph

The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

Average humidity in August
Grand Rapids, MI

Average humidity in August - Grand Rapids, MI
  • Average humidity in August: 78%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is April (75%).

Average rainfall in August
Grand Rapids, MI

Average rainfall in August - Grand Rapids, MI
  • Average rainfall in August: 0.87"

The wettest month (with the highest rainfall) is May (1.14").
The driest month (with the least rainfall) is March (0.47").

Average rainfall days in August
Grand Rapids, MI

Average rainfall days in August - Grand Rapids, MI
  • Average rainfall days in August: 9.9 days

The month with the highest number of rainy days is May (13 days).
The month with the least rainy days is February (3.8 days).

Average snowfall in August
Grand Rapids, MI

Average snowfall in August - Grand Rapids, MI
  • Average snowfall in August: 0"

The month with the highest snowfall is January (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in August
Grand Rapids, MI

Average snowfall days in August - Grand Rapids, MI
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (11.5 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
Grand Rapids, MI

Average daylight in August / Average sunshine in August - Grand Rapids, MI
  • Average daylight in August: 13h and 5min

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

  • Average sunshine in August: 9h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

Average sunshine days in August
Grand Rapids, MI

Average sunshine days in August - Grand Rapids, MI
  • Average sunshine days in August: 17.3 days

The month with the most sunshine days is September (21 days).
The month with the least sunshine days is April (13.4 days).

Average UV index in August
Grand Rapids, MI

Average UV index in August - Grand Rapids, MI
  • 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).

Average cloud cover in August
Grand Rapids, MI

Average cloud cover in August - Grand Rapids, MI
  • Average cloud cover in August: 31

The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in August
Grand Rapids, MI

Average visibility in August - Grand Rapids, MI
  • Average visibility in August: 6mi

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

Grand Rapids, Michigan, USA

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