September weather forecast
Delafield, WI

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Weather in September

The first month of the autumn, September, is also an agreeable month in Delafield, Wisconsin, with an average temperature varying between 71.4°F (21.9°C) and 53.8°F (12.1°C).

Temperature

The shift from August to September includes a small decrease in the average high-temperature, from a moderately hot 77.4°F (25.2°C) to an agreeable 71.4°F (21.9°C). Delafield experiences a mean low-temperature of 53.8°F (12.1°C) during September.

Humidity

In Delafield, the average relative humidity in September is 80%.

Rainfall

In Delafield, during September, the rain falls for 11.7 days and regularly aggregates up to 1.5" (38mm) of precipitation. In Delafield, during the entire year, the rain falls for 127.5 days and collects up to 18.94" (481mm) of precipitation.

Snowfall

In Delafield, Wisconsin, 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 6:50 am and sunset at 6:36 pm CDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 4 during September translates into the following directions:
Act with care - The need to guard against sun damage is communicated. Direct Sun exposure should be minimized especially during midday when radiation is most intense. 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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Frequently asked questions

What are September temperatures in Delafield?

September temperatures in Delafield, Wisconsin, vary between a high-temperature of 71.4°F (21.9°C) and a low-temperature of 53.8°F (12.1°C).

What is the average humidity in September in Delafield?

The average relative humidity in September is 80%.

How much does it rain in Delafield in September?

In Delafield, Wisconsin, in September, it is raining for 11.7 days, with typically 1.5" (38mm) of accumulated precipitation.

When it does not snow in Delafield?

June through September are months without snowfall in Delafield.

Does it snow in Delafield in September?

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

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

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

When are sunrise and sunset in September in Delafield?

In September, on the first day of the month, sunrise is at 6:18 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:36 pm CDT.

How many hours of sunshine does Delafield have in September?

In Delafield, the average sunshine duration in September is 8.7h.

How high is the UV index in September in Delafield?

The average daily maximum UV index in September in Delafield is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from 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
Delafield, WI

Average temperature in September - Delafield, WI
  • Average high temperature in September: 71.4°F

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (24.6°F).

  • Average low temperature in September: 53.8°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).

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Average pressure in September
Delafield, WI

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

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

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Average wind speed in September
Delafield, WI

Average wind speed in September - Delafield, WI
  • Average wind speed in September: 7.5mph

The windiest months (with the highest average wind speed) are January and February (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

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Average humidity in September
Delafield, WI

Average humidity in September - Delafield, WI
  • Average humidity in September: 80%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in September
Delafield, WI

Average rainfall in September - Delafield, WI
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is July (2.52").
The driest month (with the least rainfall) is December (0.75").

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Average rainfall days in September
Delafield, WI

Average rainfall days in September - Delafield, WI
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is February (3.3 days).

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Average snowfall in September
Delafield, WI

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

The month with the highest snowfall is January (2.99").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Delafield, WI

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

The month with the highest number of snowfall days is January (12.4 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
Delafield, WI

Average daylight in September / Average sunshine in September - Delafield, 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: 8h and 4min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).

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Average sunshine days in September
Delafield, WI

Average sunshine days in September - Delafield, WI
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is July (11.2 days).

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Average UV index in September
Delafield, WI

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

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

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Average cloud cover in September
Delafield, WI

Average cloud cover in September - Delafield, WI
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are August and September (Cloud cover 32).

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Average visibility in September
Delafield, WI

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

The 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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Delafield, Wisconsin, USA

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