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

The first month of the autumn, September, is also an agreeable month in Grand Rapids, Michigan, with an average temperature fluctuating between 72°F (22.2°C) and 54°F (12.2°C).

Temperature

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

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Grand Rapids, in September, it is raining for 6.6 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, there are 103.5 rainfall days, and 9.02" (229mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in September in Grand Rapids is 12h and 29min.
On the first day of September, 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 September, the average sunshine in Grand Rapids is 8.2h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 in September transform into the following instructions:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Grand Rapids?

In Grand Rapids, Michigan, in September, the average high-temperature is 72°F (22.2°C), and the average low-temperature is 54°F (12.2°C).

What is the average humidity in September in Grand Rapids?

In September, the average relative humidity is 77%.

How much does it rain in Grand Rapids in September?

In Grand Rapids, Michigan, in September, it is raining for 6.6 days, with typically 0.63" (16mm) of accumulated precipitation.

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, Michigan, the average day length in September is 12h and 29min.

What time 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 many hours of sunshine does Grand Rapids have in September?

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

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

In September, the average daily maximum UV index in Grand Rapids is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
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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