Monroe
Michigan, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Monroe, MI

September, the first month of the autumn, in Monroe, is still a pleasant month, with average temperature varying between 72.5°F (22.5°C) and 57°F (13.9°C).

Temperature

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

Humidity

In September, the average relative humidity is 78%.

Rainfall

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

Snowfall

In Monroe snow does not fall in May through October.

Ocean temperature

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

Sunshine

In Monroe, the average sunshine in September 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 moderate threat to health from the exposure to the Sun's UV radiation for the ordinary person.
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. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Monroe?

In Monroe, Michigan, in September, the average high-temperature is 72.5°F (22.5°C), and the average low-temperature is 57°F (13.9°C).

What is the average humidity in September in Monroe?

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

How much does it rain in Monroe in September?

In Monroe, during September, the rain falls for 9.5 days and regularly aggregates up to 0.39" (10mm) of precipitation.

What is the driest month in Monroe?

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.

When it does not snow in Monroe?

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

What is the ocean temperature in September in Monroe?

In Monroe, the average seawater temperature in September is 71.2°F (21.8°C). 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).

What is the average length of the day in September in Monroe?

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

How long on average sun shines in September in Monroe?

In Monroe, Michigan, the average sunshine in September is 8.1h.

How high is the UV index 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 health risk from the exposure to the Sun's UV rays.
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).

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%).

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

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

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 lowest number of rainy days is January (4.3 days).

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

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

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 lowest number of snowfall days are June, July, August, September and October (0 days).

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).

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 shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 8.1h

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

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).