Grand Rapids
Michigan, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Grand Rapids, MI

The vast cityscape of Grand Rapids, a moderately large town in Michigan, and two visible bridges across the river, on a warm and cool, cloudy day
The vast cityscape of Grand Rapids, a moderately large town in Michigan, and two visible bridges across the river, on a warm and cool, cloudy day
August, the last month of the summer, in Grand Rapids, is another warm month, with average temperature fluctuating between 78.6°F (25.9°C) and 60.4°F (15.8°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still warm 78.6°F (25.9°C). The average low-temperature, in Grand Rapids, is 60.4°F (15.8°C).

Humidity

In Grand Rapids, the average relative humidity is 78%.

Rainfall

In August, the rain falls for 9.9 days. Throughout August, 0.87" (22mm) of precipitation is accumulated. In Grand Rapids, during the entire year, the rain falls for 103.5 days and collects up to 9.02" (229mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in August is 13.9h.

Sunshine

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

UV index

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 hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in August in Grand Rapids?

In Grand Rapids, Michigan, 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 in Grand Rapids is 78%.

How many days does it rain in August in Grand Rapids?

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.

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

In August, the average length of the day in Grand Rapids is 13.9h.

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

In August, the average sunshine is 9.8h.

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

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

How high is the UV index in August in Grand Rapids?

In August, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.
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 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: 0.87"

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

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 lowest number of rainy days is February (3.8 days).

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

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

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).
Months with the lowest number of 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: 13.9h

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in August: 9.8h

The month with most sunshine is July (Average sunshine: 10.3h).
The month with least sunshine is January (Average sunshine: 2.3h).

Average UV index in August - Grand Rapids, MI
  • Average UV index in August: 6

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 1).