September weather forecast
Sussex, WI

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Weather in September

September, the first month of the autumn in Sussex, is still a pleasant month, with temperature in the range of an average high of 70.5°F (21.4°C) and an average low of 54.5°F (12.5°C).

Temperature

September brings a slight decrease in the average high-temperature, shifting from a warm 76.6°F (24.8°C) in August to an agreeable 70.5°F (21.4°C). Sussex experiences a consistent average temperature of 54.5°F (12.5°C) throughout the nights in September.

Humidity

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

Rainfall

In Sussex, in September, during 12.8 rainfall days, 1.97" (50mm) of precipitation is typically accumulated. Throughout the year, in Sussex, there are 149.2 rainfall days, and 28.54" (725mm) of precipitation is accumulated.

Snowfall

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

Daylight

In September, the average length of the day is 12h and 29min.
On the first day of September, sunrise is at 6:18 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:35 pm CDT.

Sunshine

The average sunshine in September is 9h.

UV index

The average daily maximum UV index in September in Sussex is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 4 in September translates into this advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
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Frequently asked questions

What are the temperatures in Sussex in September?

September temperatures in Sussex vary between a high-temperature of 70.5°F (21.4°C) and a low-temperature of 54.5°F (12.5°C).

What is the average humidity in September in Sussex?

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

How much does it rain in Sussex in September?

In Sussex, in September, it is raining for 12.8 days, with typically 1.97" (50mm) of accumulated precipitation.

When it does not snow in Sussex?

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

Does it snow in Sussex in September?

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

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

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

When is the sunrise / sunset in September in Sussex?

On the first day of September, sunrise is at 6:18 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:35 pm CDT.

How long on average sun shines in September in Sussex?

In Sussex, Wisconsin, the average sunshine duration in September is 9h.

What is the UV index reading in September in Sussex?

The average daily maximum UV index in September in Sussex is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability 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
Sussex, WI

Average temperature in September - Sussex, WI
  • Average high temperature in September: 70.5°F

The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (25.2°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).

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Average pressure in September
Sussex, WI

Average pressure in September - Sussex, WI
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Sussex, WI

Average wind speed in September - Sussex, WI
  • Average wind speed in September: 7.8mph

The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).

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Average humidity in September
Sussex, WI

Average humidity in September - Sussex, WI
  • Average humidity in September: 79%

The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (77%).

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Average rainfall in September
Sussex, WI

Average rainfall in September - Sussex, WI
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is February (1.46").

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Average rainfall days in September
Sussex, WI

Average rainfall days in September - Sussex, WI
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is February (5.3 days).

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Average snowfall in September
Sussex, WI

Average snowfall in September - Sussex, WI
  • Average snowfall in September: 0"

The month with the highest snowfall is January (5.43").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Sussex, WI

Average snowfall days in September - Sussex, WI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (15.4 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
Sussex, WI

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

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in September
Sussex, WI

Average sunshine days in September - Sussex, WI
  • Average sunshine days in September: 15 days

The month with the most sunshine days is November (15.9 days).
The months with the least sunshine days are June and July (10.3 days).

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Average UV index in September
Sussex, WI

Average UV index in September - Sussex, WI
  • Average UV index in September: 4

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Sussex, WI

Average cloud cover in September - Sussex, WI
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 30).

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Average visibility in September
Sussex, WI

Average visibility in September - Sussex, WI
  • 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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Sussex, Wisconsin, USA

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