September weather forecast
Grand Marais, MI

Weather in September

September, the first month of the autumn in Grand Marais, is also an enjoyable month, with an average temperature varying between 51.6°F (10.9°C) and 65.1°F (18.4°C).

Temperature

In Grand Marais, the average high-temperature in September slightly decreases from an agreeable 71.8°F (22.1°C) in August to a comfortable 65.1°F (18.4°C). The average low-temperature, in September, is 51.6°F (10.9°C).

Humidity

In Grand Marais, the average relative humidity in September is 80%.

Rainfall

In Grand Marais, Michigan, it is raining for 12.7 days, with typically 1.93" (49mm) of accumulated precipitation. In Grand Marais, during the entire year, the rain falls for 123.2 days and collects up to 22.17" (563mm) of precipitation.

Snowfall

In Grand Marais, Michigan, snow does not fall in June through September.

Ocean temperature

In September, the average ocean temperature is 57.2°F (14°C).
Note: Swimming in 57.2°F (14°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in September is 12h and 32min.
On the first day of the month, sunrise is at 7:04 am and sunset at 8:23 pm. On the last day of September, sunrise is at 7:41 am and sunset at 7:26 pm EDT.

Sunshine

In Grand Marais, the average sunshine in September is 7.5h.

UV index

In September, the average daily maximum UV index in Grand Marais, Michigan, is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in September transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. 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 average humidity in September in Grand Marais?

In Grand Marais, Michigan, the average relative humidity in September is 80%.

How much does it rain in Grand Marais in September?

In Grand Marais, Michigan, in September, it is raining for 12.7 days, with typically 1.93" (49mm) of accumulated precipitation.

When it does not snow in Grand Marais?

June through September are months without snowfall in Grand Marais, Michigan.

Does it snow in Grand Marais in September?

In Grand Marais, in September, it doesn't snow. In October, it regularly snows.

What is the ocean temperature in September in Grand Marais?

In September, the average ocean temperature in Grand Marais is 57.2°F (14°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in September in Grand Marais?

The average day length in September in Grand Marais is 12h and 32min.

When are sunrise and sunset in September in Grand Marais?

In September, on the first day of the month, sunrise is at 7:04 am and sunset at 8:23 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 7:26 pm EDT.

How many hours of sunshine does Grand Marais have in September?

In September, the average sunshine duration is 7.5h.

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

The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.

Average temperature in September
Grand Marais, MI

Average temperature in September - Grand Marais, MI
  • Average high temperature in September: 65.1°F

The warmest month (with the highest average high temperature) is July (72.1°F).
The month with the lowest average high temperature is January (22.8°F).

  • Average low temperature in September: 51.6°F

The month with the highest average low temperature is August (56.8°F).
The coldest month (with the lowest average low temperature) is February (13.6°F).

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Average pressure in September
Grand Marais, MI

Average pressure in September - Grand Marais, 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
Grand Marais, MI

Average wind speed in September - Grand Marais, MI
  • Average wind speed in September: 8.3mph

The windiest month (with the highest average wind speed) is November (10.1mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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Average humidity in September
Grand Marais, MI

Average humidity in September - Grand Marais, MI
  • Average humidity in September: 80%

The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is May (73%).

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Average rainfall in September
Grand Marais, MI

Average rainfall in September - Grand Marais, MI
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is October (2.8").
The driest month (with the least rainfall) is March (1.5").

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Average rainfall days in September
Grand Marais, MI

Average rainfall days in September - Grand Marais, MI
  • Average rainfall days in September: 12.7 days

The month with the highest number of rainy days is October (15.3 days).
The month with the least rainy days is February (3.1 days).

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Average snowfall in September
Grand Marais, MI

Average snowfall in September - Grand Marais, MI
  • Average snowfall in September: 0"

The month with the highest snowfall is January (10.08").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Grand Marais, MI

Average snowfall days in September - Grand Marais, MI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (24.8 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
Grand Marais, MI

Average sea temperature in September - Grand Marais, MI
  • Average sea temperature in September: 57°F

The best month for swimming (with the highest average sea temperature) is August (59°F).
The coldest months (with the lowest average sea temperature) are March and April (36°F).

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

Average daylight in September / Average sunshine in September - Grand Marais, MI
  • Average daylight in September: 12h and 32min

The month with the longest days is June (Average daylight: 15h and 47min).
The month with the shortest days is December (Average daylight: 8h and 38min).

  • Average sunshine in September: 7.5h

The month with the most sunshine is July (Average sunshine: 9.9h).
The month with the least sunshine is January (Average sunshine: 1.6h).

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Average sunshine days in September
Grand Marais, MI

Average sunshine days in September - Grand Marais, MI
  • Average sunshine days in September: 15.4 days

The month with the most sunshine days is June (16.3 days).
The month with the least sunshine days is January (5.8 days).

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Average UV index in September
Grand Marais, MI

Average UV index in September - Grand Marais, 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, November and December (UV index 1).

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Average cloud cover in September
Grand Marais, MI

Average cloud cover in September - Grand Marais, MI
  • Average cloud cover in September: 38

The month with the most cloud cover is January (Cloud cover 83).
The month with the least cloud cover is July (Cloud cover 34).

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Average visibility in September
Grand Marais, MI

Average visibility in September - Grand Marais, 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 and February (4mi).

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