September weather forecast
Rochester Hills, MI

Weather in September

September, the first month of the autumn in Rochester Hills, is still a pleasant month, with an average temperature ranging between max 71.8°F (22.1°C) and min 55.4°F (13°C).

Temperature

In Rochester Hills, the average high-temperature in September slightly decreases from a moderately hot 78.4°F (25.8°C) in August to an agreeable 71.8°F (22.1°C). In Rochester Hills, in September, the average low-temperature is 55.4°F (13°C).

Humidity

In Rochester Hills, the average relative humidity in September is 76%.

Rainfall

In Rochester Hills, it is raining for 12.1 days, with typically 1.46" (37mm) of accumulated precipitation. Throughout the year, there are 146.2 rainfall days, and 18.5" (470mm) of precipitation is accumulated.

Snowfall

In Rochester Hills, snow does not fall in June through September.

Daylight

The average length of the day in September in Rochester Hills is 12h and 29min.
On the first day of the month, sunrise is at 6:57 am and sunset at 8:07 pm. On the last day of September, in Rochester Hills, sunrise is at 7:28 am and sunset at 7:16 pm EDT.

Sunshine

In Rochester Hills, the average sunshine in September is 8.2h.

UV index

In September, the average daily maximum UV index in Rochester Hills is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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.
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FAQ

What is the temperature in September in Rochester Hills?

In September, in Rochester Hills, Michigan, the average high-temperature is 71.8°F (22.1°C), and the average low-temperature is 55.4°F (13°C).

What is the average humidity in September in Rochester Hills?

In September, the average relative humidity in Rochester Hills, Michigan, is 76%.

How much does it rain in Rochester Hills in September?

In September, in Rochester Hills, the rain falls for 12.1 days. Throughout September, 1.46" (37mm) of precipitation is accumulated.

When it does not snow in Rochester Hills?

June through September are months without snowfall.

Does it snow in Rochester Hills in September?

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

How many hours of daylight does Rochester Hills have in September?

In Rochester Hills, the average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Rochester Hills?

In September, on the first day of the month, sunrise is at 6:57 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:16 pm EDT.

How many hours of sunshine does Rochester Hills have in September?

In Rochester Hills, Michigan, the average sunshine duration in September is 8.2h.

What is the UV index intensity in September in Rochester Hills?

The average daily maximum UV index in September in Rochester Hills is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Rochester Hills, MI

Average temperature in September - Rochester Hills, MI
  • Average high temperature in September: 71.8°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 (28°F).

  • Average low temperature in September: 55.4°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).

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Average pressure in September
Rochester Hills, MI

Average pressure in September - Rochester Hills, MI
  • Average pressure in September: 30.03"Hg

The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Rochester Hills, MI

Average wind speed in September - Rochester Hills, MI
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in September
Rochester Hills, MI

Average humidity in September - Rochester Hills, MI
  • Average humidity in September: 76%

The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April, May, July and August (75%).

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Average rainfall in September
Rochester Hills, MI

Average rainfall in September - Rochester Hills, MI
  • Average rainfall in September: 1.46"

The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are February and December (1.02").

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Average rainfall days in September
Rochester Hills, MI

Average rainfall days in September - Rochester Hills, MI
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (6.4 days).

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Average snowfall in September
Rochester Hills, MI

Average snowfall in September - Rochester Hills, MI
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.02").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Rochester Hills, MI

Average snowfall days in September - Rochester Hills, MI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (15.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Rochester Hills, MI

Average daylight in September / Average sunshine in September - Rochester Hills, MI
  • Average daylight in September: 12h and 29min

The month with the longest days is June (Average daylight: 15h and 16min).
The month with the shortest days is December (Average daylight: 9h and 7min).

  • Average sunshine in September: 8h and 12min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).

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Average sunshine days in September
Rochester Hills, MI

Average sunshine days in September - Rochester Hills, MI
  • Average sunshine days in September: 14.8 days

The month with the most sunshine days is November (14.9 days).
The month with the least sunshine days is February (9.8 days).

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Average UV index in September
Rochester Hills, MI

Average UV index in September - Rochester Hills, MI
  • Average UV index in September: 4

The months with the highest UV index are 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
Rochester Hills, MI

Average cloud cover in September - Rochester Hills, MI
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 29).

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Average visibility in September
Rochester Hills, MI

Average visibility in September - Rochester Hills, MI
  • Average visibility in September: 6mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).

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