September weather forecast
Mackinac Island, MI

A tranquil neighborhood with homes and a church in a scenic natural park in Mackinac Island, Michigan
A tranquil neighborhood with homes and a church in a scenic natural park in Mackinac Island, Michigan

Weather in September

The first month of the autumn, September, is also an enjoyable month in Mackinac Island, Michigan, with an average temperature fluctuating between 53.1°F (11.7°C) and 64.8°F (18.2°C).

Temperature

In September, the average high-temperature slightly decreases from a pleasant 71.1°F (21.7°C) in August to a comfortable 64.8°F (18.2°C). In September, the average low-temperature is 53.1°F (11.7°C).

Humidity

In Mackinac Island, the average relative humidity in September is 79%.

Rainfall

In September, the rain falls for 11.4 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. In Mackinac Island, Michigan, during the entire year, the rain falls for 131 days and collects up to 21.22" (539mm) of precipitation.

Snowfall

June through September are months without snowfall in Mackinac Island.

Ocean temperature

In Mackinac Island, in September, the average water temperature is 59°F (15°C).
Note: For swimming, a surface water temperature of 59°F (15°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

In Mackinac Island, Michigan, the average length of the day in September is 12h and 31min.
On the first day of the month, sunrise is at 6:59 am and sunset at 8:17 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:21 pm EDT.

Sunshine

The average sunshine in September in Mackinac Island is 7.8h.

UV index

The average daily maximum UV index in September in Mackinac Island is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. 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 Mackinac Island?

The average high-temperature, in September, in Mackinac Island, is 64.8°F (18.2°C), while the average low-temperature is 53.1°F (11.7°C).

What is the average humidity in September in Mackinac Island?

In September, the average relative humidity in Mackinac Island is 79%.

How much does it rain in Mackinac Island in September?

In Mackinac Island, in September, during 11.4 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow in Mackinac Island?

June through September are months without snowfall.

Does it snow in Mackinac Island in September?

In Mackinac Island, in September, it doesn't snow. In October, it regularly snows.

How cold is the water in September in Mackinac Island?

In September, the average ocean temperature in Mackinac Island is 59°F (15°C). For most, swimming in 59°F (15°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does Mackinac Island have in September?

In Mackinac Island, Michigan, the average day length in September is 12h and 31min.

When are sunrise and sunset in September in Mackinac Island?

On the first day of September in Mackinac Island, sunrise is at 6:59 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:21 pm EDT.

How many hours of sunshine does Mackinac Island have in September?

The average sunshine duration in September in Mackinac Island is 7.8h.

What is the UV index intensity in September in Mackinac Island?

The average daily maximum UV index in September in Mackinac Island, Michigan, is 3. A UV Index estimate of 3 to 5 represents a moderate health threat 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
Mackinac Island, MI

Average temperature in September - Mackinac Island, MI
  • Average high temperature in September: 64.8°F

The warmest month (with the highest average high temperature) is July (71.4°F).
The month with the lowest average high temperature is January (23.4°F).

  • Average low temperature in September: 53.1°F

The month with the highest average low temperature is August (58.6°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).

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Average pressure in September
Mackinac Island, MI

Average pressure in September - Mackinac Island, MI
  • Average pressure in September: 30.01"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
Mackinac Island, MI

Average wind speed in September - Mackinac Island, MI
  • Average wind speed in September: 8.5mph

The windiest months (with the highest average wind speed) are November and December (10.9mph).
The calmest months (with the lowest average wind speed) are June and July (7.6mph).

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Average humidity in September
Mackinac Island, MI

Average humidity in September - Mackinac Island, MI
  • Average humidity in September: 79%

The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (75%).

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Average rainfall in September
Mackinac Island, MI

Average rainfall in September - Mackinac Island, MI
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is October (2.72").
The driest month (with the least rainfall) is January (1.3").

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Average rainfall days in September
Mackinac Island, MI

Average rainfall days in September - Mackinac Island, MI
  • Average rainfall days in September: 11.4 days

The month with the highest number of rainy days is October (16.5 days).
The month with the least rainy days is February (5.3 days).

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Average snowfall in September
Mackinac Island, MI

Average snowfall in September - Mackinac Island, MI
  • Average snowfall in September: 0"

The month with the highest snowfall is January (5.91").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Mackinac Island, MI

Average snowfall days in September - Mackinac Island, MI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (21.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Mackinac Island, MI

Average sea temperature in September - Mackinac Island, MI
  • Average sea temperature in September: 59°F

The best month for swimming (with the highest average sea temperature) is August (61°F).
The coldest months (with the lowest average sea temperature) are February, March and April (36°F).

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Average daylight in September /
Average sunshine in September
Mackinac Island, MI

Average daylight in September / Average sunshine in September - Mackinac Island, MI
  • Average daylight in September: 12h and 31min

The month with the longest days is June (Average daylight: 15h and 40min).
The month with the shortest days is December (Average daylight: 8h and 44min).

  • Average sunshine in September: 7h and 48min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 1h and 54min).

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Average sunshine days in September
Mackinac Island, MI

Average sunshine days in September - Mackinac Island, MI
  • Average sunshine days in September: 16.9 days

The month with the most sunshine days is September (16.9 days).
The month with the least sunshine days is January (7.1 days).

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Average UV index in September
Mackinac Island, MI

Average UV index in September - Mackinac Island, MI
  • Average UV index in September: 3

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).

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Average cloud cover in September
Mackinac Island, MI

Average cloud cover in September - Mackinac Island, MI
  • Average cloud cover in September: 34

The month with the most cloud cover is January (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 32).

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Average visibility in September
Mackinac Island, MI

Average visibility in September - Mackinac Island, MI
  • Average visibility in September: 6mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).

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