September weather forecast
Sister Bay, WI

Share

Weather in September

September, the first month of the autumn in Sister Bay, is also an enjoyable month, with an average temperature varying between 57.6°F (14.2°C) and 64.4°F (18°C).

Temperature

The arrival of September coincides with an average high-temperature of an enjoyable 64.4°F (18°C), indicating a minimal shift from August's 69.6°F (20.9°C). Sister Bay records a consistent average nighttime temperature of 57.6°F (14.2°C) in September, slightly lower than the daytime high.

Humidity

The average relative humidity in September in Sister Bay is 79%.

Rainfall

In Sister Bay, during September, the rain falls for 12.9 days and regularly aggregates up to 2.24" (57mm) of precipitation. Throughout the year, there are 141.7 rainfall days, and 26.93" (684mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Sister Bay, Wisconsin.

Daylight

The average length of the day in September in Sister Bay is 12h and 31min.
On the first day of the month, sunrise is at 6:11 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:46 am and sunset at 6:30 pm CDT.

Sunshine

The average sunshine in September is 8.8h.

UV index

In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum daily UV index of 3 during September morphs into the following directions:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
[Resources]

Frequently asked questions

What is the temperature in September in Sister Bay?

The high-temperature in Sister Bay during September is 64.4°F (18°C) and the low-temperature is 57.6°F (14.2°C).

What is the average humidity in September in Sister Bay?

In September, the average relative humidity in Sister Bay is 79%.

How many days does it rain in September in Sister Bay?

In Sister Bay, Wisconsin, during September, the rain falls for 12.9 days and regularly aggregates up to 2.24" (57mm) of precipitation.

When it does not snow in Sister Bay?

June through September are months without snowfall.

Does it snow in Sister Bay in September?

In Sister Bay, Wisconsin, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Sister Bay?

In Sister Bay, Wisconsin, the average day length in September is 12h and 31min.

When are sunrise and sunset in September in Sister Bay?

On the first day of September in Sister Bay, Wisconsin, sunrise is at 6:11 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:30 pm CDT.

How many hours of sunshine does Sister Bay have in September?

The average sunshine duration in September in Sister Bay is 8.8h.

How high is the UV index in September in Sister Bay?

In September, the average daily maximum UV index in Sister Bay is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
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
Sister Bay, WI

Average temperature in September - Sister Bay, WI
  • Average high temperature in September: 64.4°F

The warmest month (with the highest average high temperature) is August (69.6°F).
The month with the lowest average high temperature is January (25.2°F).

  • Average low temperature in September: 57.6°F

The month with the highest average low temperature is August (63°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).

[Resources]

Average pressure in September
Sister Bay, WI

Average pressure in September - Sister Bay, WI
  • Average pressure in September: 30.01"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).

[Resources]

Average wind speed in September
Sister Bay, WI

Average wind speed in September - Sister Bay, WI
  • Average wind speed in September: 12mph

The windiest month (with the highest average wind speed) is December (15.5mph).
The calmest months (with the lowest average wind speed) are June and July (9.6mph).

[Resources]

Average humidity in September
Sister Bay, WI

Average humidity in September - Sister Bay, WI
  • Average humidity in September: 79%

The months with the highest relative humidity are January and June (84%).
The month with the lowest relative humidity is November (76%).

[Resources]

Average rainfall in September
Sister Bay, WI

Average rainfall in September - Sister Bay, WI
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is October (3.07").
The driest months (with the least rainfall) are January and February (1.38").

[Resources]

Average rainfall days in September
Sister Bay, WI

Average rainfall days in September - Sister Bay, WI
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is August (15.6 days).
The month with the least rainy days is February (4.8 days).

[Resources]

Average snowfall in September
Sister Bay, WI

Average snowfall in September - Sister Bay, WI
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.49").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in September
Sister Bay, WI

Average snowfall days in September - Sister Bay, WI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (14.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Sister Bay, WI

Average daylight in September / Average sunshine in September - Sister Bay, WI
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 8h and 5min

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).

[Resources]

Average sunshine days in September
Sister Bay, WI

Average sunshine days in September - Sister Bay, WI
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is September (15.1 days).
The month with the least sunshine days is January (8.3 days).

[Resources]

Average UV index in September
Sister Bay, WI

Average UV index in September - Sister Bay, WI
  • Average UV index in September: 3

The months with the highest UV index are July and August (UV index 5).
The months with the lowest UV index are January, March and December (UV index 1).

[Resources]

Average cloud cover in September
Sister Bay, WI

Average cloud cover in September - Sister Bay, WI
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 28).

[Resources]

Average visibility in September
Sister Bay, WI

Average visibility in September - Sister Bay, WI
  • Average visibility in September: 6mi

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

[Resources]

Sister Bay, Wisconsin, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location