September weather forecast
Monroe, MI

Weather in September

The first month of the autumn, September, is also an agreeable month in Monroe, Michigan, with temperature in the range of an average low of 57°F (13.9°C) and an average high of 72.5°F (22.5°C).

Temperature

In Monroe, Michigan, the average high-temperature in September slightly decreases from a moderately hot 78.3°F (25.7°C) in August to an agreeable 72.5°F (22.5°C). In September, the average low-temperature is 57°F (13.9°C).

Humidity

The average relative humidity in September in Monroe, Michigan, is 78%.

Rainfall

The month with the least rainfall in Monroe is September, when the rain falls for 9.5 days and typically collects 0.39" (10mm) of precipitation.

Snowfall

May through October are months without snowfall in Monroe.

Ocean temperature

In Monroe, the average water temperature is 71.2°F (21.8°C).
Note: For most, swimming in 71.2°F (21.8°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).

Daylight

The average length of the day in September in Monroe, Michigan, is 12h and 28min.
On the first day of September, sunrise is at 6:59 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 7:17 pm EDT.

Sunshine

In September, the average sunshine is 8.1h.

UV index

In Monroe, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the average humidity in September in Monroe?

In September, the average relative humidity in Monroe is 78%.

What is the driest month in Monroe?

September is the month with the least rainfall in Monroe. Rain falls for 9.5 days and accumulates 0.39" (10mm) of precipitation.

How many days does it rain in September in Monroe?

In Monroe, Michigan, in September, it is raining for 9.5 days, with typically 0.39" (10mm) of accumulated precipitation.

When it does not snow in Monroe?

In Monroe, snow does not fall in May through October.

What is the ocean temperature in September in Monroe?

In Monroe, Michigan, in September, the average water temperature is 71.2°F (21.8°C). For swimming, a surface water temperature of 71.2°F (21.8°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).

How many hours of daylight does Monroe have in September?

In September, the average day length in Monroe, Michigan, is 12h and 28min.

When is the sunrise / sunset in September in Monroe?

In September, on the first day of the month, sunrise is at 6:59 am and sunset at 8:07 pm. On the last day of the month, in Monroe, Michigan, sunrise is at 7:29 am and sunset at 7:17 pm EDT.

How many hours of sunshine does Monroe have in September?

In September, the average sunshine duration is 8.1h.

What is the UV index reading in September in Monroe?

In Monroe, Michigan, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.

Average temperature in September
Monroe, MI

Average temperature in September - Monroe, MI
  • Average high temperature in September: 72.5°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 57°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19°F).

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Average pressure in September
Monroe, MI

Average pressure in September - Monroe, MI
  • Average pressure in September: 30.04"

The month with the highest atmospheric pressure is November (30.1").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
Monroe, MI

Average wind speed in September - Monroe, MI
  • Average wind speed in September: 7.5mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity in September
Monroe, MI

Average humidity in September - Monroe, MI
  • Average humidity in September: 78%

The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is October (75%).

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Average rainfall in September
Monroe, MI

Average rainfall in September - Monroe, MI
  • Average rainfall in September: 0.39"

The wettest months (with the highest rainfall) are May, June and August (1.06").
The driest month (with the least rainfall) is September (0.39").

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Average rainfall days in September
Monroe, MI

Average rainfall days in September - Monroe, MI
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is May (12.2 days).
The month with the least rainy days is January (4.3 days).

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Average snowfall in September
Monroe, MI

Average snowfall in September - Monroe, MI
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Monroe, MI

Average snowfall days in September - Monroe, MI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in September
Monroe, MI

Average sea temperature in September - Monroe, MI
  • Average sea temperature in September: 71.2°F

The best month for swimming (with the highest average sea temperature) is August (76.4°F).
The coldest month (with the lowest average sea temperature) is February (32.6°F).

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Average daylight in September /
Average sunshine in September
Monroe, MI

Average daylight in September / Average sunshine in September - Monroe, MI
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 11min).
The month with the shortest days is December (Average daylight: 9h and 11min).

  • Average sunshine in September: 8.1h

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is January (Average sunshine: 3.2h).

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Average sunshine days in September
Monroe, MI

Average sunshine days in September - Monroe, MI
  • Average sunshine days in September: 18 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is April (14.9 days).

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Average UV index in September
Monroe, MI

Average UV index in September - Monroe, MI
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
Monroe, MI

Average cloud cover in September - Monroe, MI
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is July (Cloud cover 29).

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Average visibility in September
Monroe, MI

Average visibility in September - Monroe, 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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