September weather forecast and climate
Monroe, MI

Weather in September

September, the first month of the autumn, in Monroe, is also an agreeable month, with average temperature fluctuating between 72.5°F (22.5°C) and 57°F (13.9°C).

Temperature

In Monroe, the average high-temperature marginally drops, from a moderately hot 78.3°F (25.7°C) in August, to a pleasant 72.5°F (22.5°C). In Monroe, the average low-temperature is 57°F (13.9°C).

Humidity

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

Rainfall

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

Snowfall

In Monroe snow does not fall in May through October.

Ocean temperature

In September, the average ocean temperature is 71.2°F (21.8°C).
Note: Swimming in 71.2°F (21.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In September, the average length of the day is 12.5h.

Sunshine

The average sunshine in Monroe is 8.1h.

UV index

The average daily maximum UV index in Monroe is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Monroe?

In Monroe, the average relative humidity in September 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, 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, Michigan, snow does not fall in May through October.

How cold is the water in September in Monroe?

In September, the average ocean temperature in Monroe 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?

The average length of the day in September in Monroe is 12.5h.

How many hours of sunshine does Monroe have in September?

In September, the average sunshine is 8.1h.

What is the UV index intensity in September in Monroe?

The average daily maximum UV index in September in Monroe is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in September
Monroe, MI

Average temperature in September - Monroe, MI
  • Average high temperature in September: 22.5°C

The warmest month (with the highest average high temperature) is July (26.8°C).
The month with the lowest average high temperature is January (-1.3°C).

  • Average low temperature in September: 13.9°C

The month with the highest average low temperature is July (17.8°C).
The coldest month (with the lowest average low temperature) is January (-7.2°C).

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Average pressure in September
Monroe, MI

Average pressure in September - Monroe, MI
  • Average pressure in September: 1017.2mbar

The month with the highest atmospheric pressure is November (1019.4mbar).
The month with the lowest atmospheric pressure is June (1013.5mbar).

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Average wind speed in September
Monroe, MI

Average wind speed in September - Monroe, MI
  • Average wind speed in September: 12.1km/h

The windiest month (with the highest average wind speed) is January (16.7km/h).
The calmest month (with the lowest average wind speed) is July (10.7km/h).

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Average humidity in September
Monroe, MI

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

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: 10mm

The wettest months (with the highest rainfall) are May, June and August (27mm).
The driest month (with the least rainfall) is September (10mm).

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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: 0mm

The month with the highest snowfall is February (26mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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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).
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: 21.8°C

The best month for swimming (with the highest average sea temperature) is August (24.7°C).
The coldest month (with the lowest average sea temperature) is February (0.3°C).

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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: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • 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

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: 9km

The month with the highest visibility is October (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, November and December (9km).

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