September weather forecast
Germantown, WI

Weather in September

September, the first month of the autumn, in Germantown, is also an agreeable month, with average temperature varying between 70°F (21.1°C) and 55.4°F (13°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 76.6°F (24.8°C) in August, to a pleasant 70°F (21.1°C). The average low-temperature, in September, is 55.4°F (13°C).

Humidity

The average relative humidity in Germantown is 79%.

Rainfall

In September, in Germantown, Wisconsin, the rain falls for 12.4 days. Throughout September, 2.17" (55mm) of precipitation is accumulated. In Germantown, during the entire year, the rain falls for 139.2 days and collects up to 25.28" (642mm) of precipitation.

Snowfall

In Germantown, Wisconsin, snow does not fall in May through September.

Daylight

The average length of the day in Germantown is 12.5h.

Sunshine

The average sunshine in Germantown is 9.2h.

UV index

In September, the average daily maximum UV index in Germantown is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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 average humidity in September in Germantown?

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

How many days does it rain in September in Germantown?

In September, in Germantown, Wisconsin, the rain falls for 12.4 days. Throughout September, 2.17" (55mm) of precipitation is accumulated.

When it does not snow in Germantown?

In Germantown, Wisconsin, snow does not fall in May through September.

Does it snow in Germantown in September?

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

How many hours of daylight does Germantown have in September?

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

How long on average sun shines in September in Germantown?

The average sunshine in September is 9.2h.

What is the UV index reading in September in Germantown?

The average daily maximum UV index in September in Germantown, Wisconsin, is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in September
Germantown, WI

Average temperature in September - Germantown, WI
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (25.2°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 (14.4°F).

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Average pressure in September
Germantown, WI

Average pressure in September - Germantown, WI
  • Average pressure in September: 30.03"

Months with the highest atmospheric pressure are January, February and March (30.09").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Germantown, WI

Average wind speed in September - Germantown, WI
  • Average wind speed in September: 8.2mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

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Average humidity in September
Germantown, WI

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

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (76%).

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Average rainfall in September
Germantown, WI

Average rainfall in September - Germantown, WI
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is February (1.02").

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Average rainfall days in September
Germantown, WI

Average rainfall days in September - Germantown, WI
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (4.1 days).

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Average snowfall in September
Germantown, WI

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

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

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Average snowfall days in September
Germantown, WI

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

The month with the highest number of snowfall days is January (12.6 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Germantown, WI

Average daylight in September / Average sunshine in September - Germantown, WI
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is January (Average sunshine: 3.6h).

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Average sunshine days in September
Germantown, WI

Average sunshine days in September - Germantown, WI
  • Average sunshine days in September: 15.4 days

The month with the most sunshine days is December (15.9 days).
The month with the least sunshine days is April (12 days).

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Average UV index in September
Germantown, WI

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

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in September
Germantown, WI

Average cloud cover in September - Germantown, WI
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 63).
Months with the least cloud cover are July and August (Cloud cover 28).

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Average visibility in September
Germantown, WI

Average visibility in September - Germantown, WI
  • Average visibility in September: 6mi

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

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