September weather forecast
Frankfort, MI

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The Point Betsie Lighthouse in Frankfort, Michigan
The Point Betsie Lighthouse in Frankfort, Michigan

Weather in September

September marks the commencement of autumn in Frankfort. The nights get longer, temperatures dip, but the days remain comfortably warm. The leaves start changing, offering a riot of colors that are a treat for the eyes. The move from summer to fall is marked by a decrease in average maximum temperatures to 65.8°F (18.8°C). The gentle autumn breeze brings along a unique charm that makes September a desirable month.

Temperature

September is characterized by a slight reduction in average high-temperature, easing from a pleasant 71.2°F (21.8°C) in August to a refreshing 65.8°F (18.8°C). Frankfort experiences a subtle drop in temperature during the September nights, recording an average of 56.8°F (13.8°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In September, the rain falls for 10 days. Throughout September, 0.71" (18mm) of precipitation is accumulated. Throughout the year, in Frankfort, there are 94.1 rainfall days, and 7.83" (199mm) of precipitation is accumulated.

Snowfall

In Frankfort, snow does not fall in June through September.

Daylight

In Frankfort, the average length of the day in September is 12h and 30min.
On the first day of the month, sunrise is at 7:08 am and sunset at 8:21 pm. On the last day of September, in Frankfort, sunrise is at 7:42 am and sunset at 7:26 pm EDT.

Sunshine

In Frankfort, the average sunshine in September is 8.1h.

UV index

In Frankfort, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 3 in September translates into these instructions:
Be cautious. Those with fair skin can be subjected to burns in fewer 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. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Frankfort in September?

September temperatures in Frankfort, Michigan, vary between a high-temperature of 65.8°F (18.8°C) and a low-temperature of 56.8°F (13.8°C).

What is the average humidity in September in Frankfort?

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

How much does it rain in Frankfort in September?

In Frankfort, in September, during 10 rainfall days, 0.71" (18mm) of precipitation is typically accumulated.

When it does not snow in Frankfort?

In Frankfort, snow does not fall in June through September.

Does it snow in Frankfort in September?

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

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

In September, the average day length in Frankfort, Michigan, is 12h and 30min.

When is the sunrise / sunset in September in Frankfort?

In September, on the first day of the month, sunrise is at 7:08 am and sunset at 8:21 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 7:26 pm EDT.

How many hours of sunshine does Frankfort have in September?

The average sunshine duration in September in Frankfort is 8.1h.

How high is the UV index in September in Frankfort?

The average daily maximum UV index in September in Frankfort, Michigan, is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health 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
Frankfort, MI

Average temperature in September - Frankfort, MI
  • Average high temperature in September: 65.8°F

The warmest month (with the highest average high temperature) is August (71.2°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in September: 56.8°F

The month with the highest average low temperature is August (62.8°F).
The coldest months (with the lowest average low temperature) are January and February (20.7°F).

Average pressure in September
Frankfort, MI

Average pressure in September - Frankfort, MI
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Frankfort, MI

Average wind speed in September - Frankfort, MI
  • Average wind speed in September: 11.4mph

The windiest month (with the highest average wind speed) is January (14.9mph).
The calmest month (with the lowest average wind speed) is July (9.3mph).

Average humidity in September
Frankfort, MI

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

The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are April, October and November (77%).

Average rainfall in September
Frankfort, MI

Average rainfall in September - Frankfort, MI
  • Average rainfall in September: 0.71"

The wettest month (with the highest rainfall) is October (0.91").
The driest month (with the least rainfall) is February (0.43").

Average rainfall days in September
Frankfort, MI

Average rainfall days in September - Frankfort, MI
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is July (11 days).
The month with the least rainy days is February (2.6 days).

Average snowfall in September
Frankfort, MI

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

The month with the highest snowfall is January (1.06").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Frankfort, MI

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

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Frankfort, MI
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 1h and 54min).

Average sunshine days in September
Frankfort, MI

Average sunshine days in September - Frankfort, MI
  • Average sunshine days in September: 17.7 days

The months with the most sunshine days are March and May (18.8 days).
The month with the least sunshine days is February (14.6 days).

Average UV index in September
Frankfort, MI

Average UV index in September - Frankfort, 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 and December (UV index 1).

Average cloud cover in September
Frankfort, MI

Average cloud cover in September - Frankfort, MI
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 81).
The month with the least cloud cover is July (Cloud cover 27).

Average visibility in September
Frankfort, MI

Average visibility in September - Frankfort, 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).

Frankfort, Michigan, USA

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