September weather forecast
Port Huron, MI

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The iconic Blue Water Bridge in Port Huron, Michigan, at night
The iconic Blue Water Bridge in Port Huron, Michigan, at night

Weather in September

September in Port Huron marks the beginning of autumn. There's a significant drop in temperature, descending to a high of 71.2°F (21.8°C). This period is characterized by a balance between the fading summer warmth and the steadily creeping in autumn chills. As leaves start changing color, the city turns into an autumnal tapestry of russets, oranges, and yellows. The weather continues to cool as October approaches, heralding the fall season in full form.

Temperature

A moderate decline in average high-temperatures is noted in Port Huron in September, moving from a warm 77.5°F (25.3°C) in August to a pleasant 71.2°F (21.8°C). The average low-temperature of 55.2°F (12.9°C) is witnessed during September.

Humidity

In September, the average relative humidity in Port Huron, Michigan, is 78%.

Rainfall

In Port Huron, in September, it is raining for 12.4 days, with typically 1.38" (35mm) of accumulated precipitation. In Port Huron, during the entire year, the rain falls for 140.4 days and collects up to 19.41" (493mm) of precipitation.

Snowfall

In Port Huron, Michigan, snow does not fall in June through September.

Ocean temperature

In Port Huron, the average seawater temperature in September is 69.4°F (20.8°C).
Note: Swimming in 69.4°F (20.8°C) is not pleasurable for most people. Breathing control grows increasingly challenging as the water temperature falls under 69.8°F (21°C).

Daylight

In September, the average length of the day in Port Huron is 12h and 29min.
On the first day of the month, sunrise is at 6:55 am and sunset at 8:03 pm. On the last day of September, in Port Huron, sunrise is at 7:26 am and sunset at 7:12 pm EDT.

Sunshine

The average sunshine in September in Port Huron, Michigan, is 8.2h.

UV index

In Port Huron, Michigan, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: A maximum UV index of 3 in September translates into the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. 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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Frequently asked questions

What are the temperatures in Port Huron in September?

During September, Port Huron experiences an average high-temperature of 71.2°F (21.8°C) and a low-temperature of 55.2°F (12.9°C).

What is the average humidity in September in Port Huron?

The average relative humidity in September in Port Huron is 78%.

How many days does it rain in September in Port Huron?

In September, in Port Huron, the rain falls for 12.4 days. Throughout September, 1.38" (35mm) of precipitation is accumulated.

When it does not snow in Port Huron?

June through September are months without snowfall.

Does it snow in Port Huron in September?

In Port Huron, Michigan, in September, it doesn't snow. In October, it regularly snows.

What is the ocean temperature in September in Port Huron?

In Port Huron, in September, the average water temperature is 69.4°F (20.8°C). Swimming in 69.4°F (20.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Port Huron have in September?

In Port Huron, the average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Port Huron?

On the first day of September, sunrise is at 6:55 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:12 pm EDT.

How long on average sun shines in September in Port Huron?

The average sunshine duration in September in Port Huron is 8.2h.

What is the UV index intensity in September in Port Huron?

The average daily maximum UV index in September in Port Huron is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Port Huron, MI

Average temperature in September - Port Huron, MI
  • Average high temperature in September: 71.2°F

The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in September: 55.2°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

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Average pressure in September
Port Huron, MI

Average pressure in September - Port Huron, 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 (29.93"Hg).

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Average wind speed in September
Port Huron, MI

Average wind speed in September - Port Huron, MI
  • Average wind speed in September: 7.9mph

The windiest month (with the highest average wind speed) is January (11.3mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).

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Average humidity in September
Port Huron, MI

Average humidity in September - Port Huron, MI
  • Average humidity in September: 78%

The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April and May (76%).

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Average rainfall in September
Port Huron, MI

Average rainfall in September - Port Huron, MI
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is February (1.1").

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Average rainfall days in September
Port Huron, MI

Average rainfall days in September - Port Huron, MI
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (5.7 days).

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Average snowfall in September
Port Huron, MI

Average snowfall in September - Port Huron, MI
  • Average snowfall in September: 0"

The month with the highest snowfall is February (3.9").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Port Huron, MI

Average snowfall days in September - Port Huron, MI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (14.4 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
Port Huron, MI

Average sea temperature in September - Port Huron, MI
  • Average sea temperature in September: 69.4°F

The best month for swimming (with the highest average sea temperature) is August (73.7°F).
The coldest month (with the lowest average sea temperature) is February (32.4°F).

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Average daylight in September /
Average sunshine in September
Port Huron, MI

Average daylight in September / Average sunshine in September - Port Huron, 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 54min).

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Average sunshine days in September
Port Huron, MI

Average sunshine days in September - Port Huron, MI
  • Average sunshine days in September: 15 days

The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is February (11.3 days).

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Average UV index in September
Port Huron, MI

Average UV index in September - Port Huron, MI
  • Average UV index in September: 3

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).

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Average cloud cover in September
Port Huron, MI

Average cloud cover in September - Port Huron, MI
  • Average cloud cover in September: 35

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in September
Port Huron, MI

Average visibility in September - Port Huron, MI
  • Average visibility in September: 6mi

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

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Port Huron, Michigan, USA

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