September weather forecast
Byron, WI

Share

Weather in September

The first month of the autumn, September, is still a pleasant month in Byron, Wisconsin, with an average temperature ranging between max 69.6°F (20.9°C) and min 52°F (11.1°C).

Temperature

Byron in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 76.6°F (24.8°C) to a pleasant 69.6°F (20.9°C). Byron witnesses an average low-temperature of 52°F (11.1°C) throughout the month of September.

Humidity

The average relative humidity in September is 81%.

Rainfall

In September, the rain falls for 8.2 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. Throughout the year, there are 90.7 rainfall days, and 7.56" (192mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:18 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:36 pm CDT.

Sunshine

The average sunshine in September is 8.6h.

UV index

The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: During September, 3 as the daily maximum UV index converts into the following advice:
Heed the precautions - It is counselled to guard against solar damage. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Updated: Aug 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

During September, Byron experiences an average high-temperature of 69.6°F (20.9°C) and a low-temperature of 52°F (11.1°C).

What is the average humidity in September?

In Byron, the average relative humidity in September is 81%.

How many days does it rain in September?

In Byron, in September, during 8.2 rainfall days, 0.63" (16mm) of precipitation is typically accumulated.

When it does not snow?

May through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Byron have in September?

The average day length in September is 12h and 29min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:18 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:36 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September in Byron is 8.6h.

How high is the UV index in September?

In Byron, Wisconsin, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat 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
Byron, WI

Average temperature in September - Byron, WI
  • Average high temperature in September: 69.6°F

The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is January (22.5°F).

  • Average low temperature in September: 52°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).

Average pressure in September
Byron, WI

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

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

Average wind speed in September
Byron, WI

Average wind speed in September - Byron, WI
  • Average wind speed in September: 8mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).

Average humidity in September
Byron, WI

Average humidity in September - Byron, WI
  • Average humidity in September: 81%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is April (76%).

Average rainfall in September
Byron, WI

Average rainfall in September - Byron, WI
  • Average rainfall in September: 0.63"

The wettest months (with the highest rainfall) are June and October (0.94").
The driest months (with the least rainfall) are January and February (0.31").

Average rainfall days in September
Byron, WI

Average rainfall days in September - Byron, WI
  • Average rainfall days in September: 8.2 days

The months with the highest number of rainy days are April and July (11 days).
The month with the least rainy days is February (2.3 days).

Average snowfall in September
Byron, WI

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

The month with the highest snowfall is January (1.06").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Byron, WI

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

The month with the highest number of snowfall days is January (10.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).

Average sunshine days in September
Byron, WI

Average sunshine days in September - Byron, WI
  • Average sunshine days in September: 19.1 days

The month with the most sunshine days is December (21.5 days).
The month with the least sunshine days is June (15.6 days).

Average UV index in September
Byron, WI

Average UV index in September - Byron, WI
  • Average UV index in September: 3

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, November and December (UV index 1).

Average cloud cover in September
Byron, WI

Average cloud cover in September - Byron, WI
  • Average cloud cover in September: 36

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in September
Byron, WI

Average visibility in September - Byron, WI
  • Average visibility in September: 5mi

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

Byron, Wisconsin, USA

Weather forecast for your location

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