September weather forecast
La Crosse, IL

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Weather in September

The first month of the autumn, September, is still a warm month in La Crosse, Illinois, with an average temperature varying between 57.4°F (14.1°C) and 76.8°F (24.9°C).

Temperature

In September, the meteorological conditions change slightly, with the average high-temperature moving from a warm 82.2°F (27.9°C) in August to a still moderately hot 76.8°F (24.9°C). During the September nights, an average temperature of 57.4°F (14.1°C) is observed.

Humidity

The average relative humidity in September is 75%.

Rainfall

In September, the rain falls for 10.2 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. Throughout the year, in La Crosse, there are 127.6 rainfall days, and 21.02" (534mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In La Crosse, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:47 pm CDT.

Sunshine

In September, the average sunshine in La Crosse is 9.3h.

UV index

In La Crosse, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum high daily UV index of 5 during September translates into the following directions:
Take precautions - Protection against sun damage is advised. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Updated: Jun 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

The high-temperature, in September, in La Crosse, records 76.8°F (24.9°C), while the low-temperature is 57.4°F (14.1°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is appraised at 89.6°F (32°C).

What is the average humidity in September?

In September, the average relative humidity is 75%.

How many days does it rain in September?

In La Crosse, Illinois, in September, during 10.2 rainfall days, 1.77" (45mm) of precipitation is typically accumulated.

When it does not snow?

In La Crosse, snow does not fall in May through September.

Does it snow in September?

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

How many hours of daylight does La Crosse have in September?

In September, the average day length is 12h and 27min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:32 am and sunset at 7:35 pm. On the last day of the month, in La Crosse, sunrise is at 7:00 am and sunset at 6:47 pm CDT.

How long on average sun shines in September?

In La Crosse, the average sunshine duration in September is 9.3h.

How high is the UV index in September in La Crosse?

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat 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
La Crosse, IL

Average temperature in September - La Crosse, IL
  • Average high temperature in September: 76.8°F

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (30.9°F).

  • Average low temperature in September: 57.4°F

The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

Average pressure in September
La Crosse, IL

Average pressure in September - La Crosse, IL
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in September
La Crosse, IL

Average wind speed in September - La Crosse, IL
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).

Average humidity in September
La Crosse, IL

Average humidity in September - La Crosse, IL
  • Average humidity in September: 75%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
La Crosse, IL

Average rainfall in September - La Crosse, IL
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is January (0.83").

Average rainfall days in September
La Crosse, IL

Average rainfall days in September - La Crosse, IL
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.3 days).

Average snowfall in September
La Crosse, IL

Average snowfall in September - La Crosse, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (3.15").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
La Crosse, IL

Average snowfall days in September - La Crosse, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.5 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
La Crosse, IL

Average daylight in September / Average sunshine in September - La Crosse, IL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 2min

The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in September
La Crosse, IL

Average sunshine days in September - La Crosse, IL
  • Average sunshine days in September: 18.4 days

The month with the most sunshine days is December (20 days).
The months with the least sunshine days are May and June (11.8 days).

Average UV index in September
La Crosse, IL

Average UV index in September - La Crosse, IL
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
La Crosse, IL

Average cloud cover in September - La Crosse, IL
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).

Average visibility in September
La Crosse, IL

Average visibility in September - La Crosse, IL
  • Average visibility in September: 6mi

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

La Crosse, Illinois, USA

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