Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With September's onset, the weather in Grand Rapids reveals a slight temperature decrease, transitioning from a moderately hot 78.6°F (25.9°C) in August to an agreeable 72°F (22.2°C). Throughout September, Grand Rapids encounters an average temperature drop to a fresh 54°F (12.2°C).Humidity
In September, the average relative humidity is 77%.Rainfall
In Grand Rapids, in September, during 6.6 rainfall days, 0.63" (16mm) 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 September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 7:08 am and sunset at 8:16 pm. On the last day of September, in Grand Rapids, sunrise is at 7:39 am and sunset at 7:25 pm EDT.
Sunshine
The average sunshine in September is 8.2h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 4 during September translates into these guidelines:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Direct Sun exposure should be minimized especially during midday when radiation is most intense. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Frequently asked questions
What is the temperature in September in Grand Rapids?
What is the average humidity in September in Grand Rapids?
How many days does it rain in September in Grand Rapids?
When it does not snow in Grand Rapids?
What is the average length of the day in September in Grand Rapids?
When are sunrise and sunset in September in Grand Rapids?
How long on average sun shines in September in Grand Rapids?
What is the UV index intensity in September in Grand Rapids?
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Grand Rapids, MI
- Average daylight in September: 12h and 3min
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 September: 8h and 1min
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 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).
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).
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).
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).
Grand Rapids, Michigan, USA
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