September weather forecast
Grand Rapids, MI

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 September

September, the first month of the autumn in Grand Rapids, is still a pleasant month, with an average temperature varying between 72°F (22.2°C) and 54°F (12.2°C).

Temperature

In Grand Rapids, the average high-temperature in September marginally drops from a warm 78.6°F (25.9°C) in August to a pleasant 72°F (22.2°C). In September, in Grand Rapids, the average low-temperature is 54°F (12.2°C).

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Grand Rapids, during 6.6 rainfall days, 0.63" (16mm) of precipitation is typically 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

May through October are months without snowfall in Grand Rapids.

Daylight

In Grand Rapids, the average length of the day in September is 12h and 29min.
On the first day of September in Grand Rapids, sunrise is at 7:07 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 7:26 pm EDT.

Sunshine

In Grand Rapids, the average sunshine in September is 8.2h.

UV index

In Grand Rapids, Michigan, the average daily maximum UV index in September is 4. A UV Index reading 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 4 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the average humidity in September in Grand Rapids?

In Grand Rapids, the average relative humidity in September is 77%.

How much does it rain in Grand Rapids in September?

In September, in Grand Rapids, the rain falls for 6.6 days. Throughout September, 0.63" (16mm) of precipitation is accumulated.

When it does not snow in Grand Rapids?

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

How many hours of daylight does Grand Rapids have in September?

In Grand Rapids, the average day length in September is 12h and 29min.

When are sunrise and sunset in September in Grand Rapids?

In September, on the first day of the month, sunrise is at 7:07 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 7:26 pm EDT.

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

In September, the average sunshine duration in Grand Rapids is 8.2h.

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

In Grand Rapids, Michigan, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Grand Rapids, MI

Average temperature in September - Grand Rapids, MI
  • Average high temperature in September: 72°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 September: 54°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).

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Average pressure in September
Grand Rapids, MI

Average pressure in September - Grand Rapids, MI
  • Average pressure in September: 30.03"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).

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Average wind speed in September
Grand Rapids, MI

Average wind speed in September - Grand Rapids, MI
  • Average wind speed in September: 7.4mph

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).

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Average humidity in September
Grand Rapids, MI

Average humidity in September - Grand Rapids, MI
  • Average humidity in September: 77%

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

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Average rainfall in September
Grand Rapids, MI

Average rainfall in September - Grand Rapids, MI
  • Average rainfall in September: 0.63"

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

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Average rainfall days in September
Grand Rapids, MI

Average rainfall days in September - Grand Rapids, MI
  • Average rainfall days in September: 6.6 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).

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Average snowfall in September
Grand Rapids, MI

Average snowfall in September - Grand Rapids, MI
  • Average snowfall in September: 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").

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Average snowfall days in September
Grand Rapids, MI

Average snowfall days in September - Grand Rapids, MI
  • Average snowfall days in September: 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).

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Average daylight in September /
Average sunshine in September
Grand Rapids, MI

Average daylight in September / Average sunshine in September - Grand Rapids, MI
  • Average daylight in September: 12h and 29min

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 4min).

  • Average sunshine in September: 8h and 12min

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).

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Average sunshine days in September
Grand Rapids, MI

Average sunshine days in September - Grand Rapids, MI
  • Average sunshine days in September: 21 days

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

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Average UV index in September
Grand Rapids, MI

Average UV index in September - Grand Rapids, MI
  • Average UV index in September: 4

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).

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Average cloud cover in September
Grand Rapids, MI

Average cloud cover in September - Grand Rapids, MI
  • Average cloud cover in September: 33

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

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Average visibility in September
Grand Rapids, MI

Average visibility in September - Grand Rapids, MI
  • Average visibility in September: 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).

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