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
Grand Haven experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a warm 75.2°F (24°C) in August to an agreeable 69.4°F (20.8°C). Grand Haven's average low-temperature during September nights is observed to be a mild 58.1°F (14.5°C).Humidity
In Grand Haven, the average relative humidity in September is 77%.Rainfall
In September, the rain falls for 12.7 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. Throughout the year, in Grand Haven, Michigan, there are 139.5 rainfall days, and 22.8" (579mm) of precipitation is accumulated.Snowfall
In Grand Haven, Michigan, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 29min.On the first day of September in Grand Haven, sunrise is at 7:10 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 7:27 pm EDT.
Sunshine
In Grand Haven, the average sunshine in September is 8.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Put precautions into practice - Guidance to elude sunburn is provided. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. 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.
Frequently asked questions
What is the usual temperature for Grand Haven in September?
What is the average humidity in September in Grand Haven?
How much does it rain in Grand Haven in September?
When it does not snow in Grand Haven?
How many hours of daylight does Grand Haven have in September?
What time are sunrise and sunset in September in Grand Haven?
How long on average sun shines in September in Grand Haven?
What is the UV index intensity in September in Grand Haven?
Average temperature in September
Grand Haven, MI
- Average high temperature in September: 69.4°F
The warmest month (with the highest average high temperature) is August (75.2°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).
Average pressure in September
Grand Haven, 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 Haven, MI
- Average wind speed in September: 9.8mph
The windiest months (with the highest average wind speed) are January and November (12.6mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in September
Grand Haven, MI
- Average humidity in September: 77%
The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are October and November (76%).
Average rainfall in September
Grand Haven, MI
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is October (2.56").
The driest month (with the least rainfall) is November (1.22").
Average rainfall days in September
Grand Haven, MI
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is October (16.5 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in September
Grand Haven, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.13").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Grand Haven, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grand Haven, 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 48min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in September
Grand Haven, MI
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is March (16.2 days).
The month with the least sunshine days is January (9.2 days).
Average UV index in September
Grand Haven, MI
- Average UV index in September: 4
The months with the highest UV index are 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 Haven, MI
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Grand Haven, MI
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Grand Haven, Michigan, USA
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