September weather forecast
Arrowsmith, IL

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Weather in September

September, the first month of the autumn in Arrowsmith, is still a warm month, with temperature in the range of an average high of 75.9°F (24.4°C) and an average low of 57.9°F (14.4°C).

Temperature

Arrowsmith's average high-temperature in September is a still moderately hot 75.9°F (24.4°C), marking an insignificant difference from the 79.9°F (26.6°C) of August. Arrowsmith experiences an average temperature drop to a moderate 57.9°F (14.4°C) during September nights.

Humidity

In Arrowsmith, the average relative humidity in September is 76%.

Rainfall

In September, the rain falls for 11.6 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. In Arrowsmith, Illinois, during the entire year, the rain falls for 139 days and collects up to 20.83" (529mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Arrowsmith, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:37 pm CDT.

Sunshine

In September, the average sunshine is 9h.

UV index

In Arrowsmith, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In September, in Arrowsmith, the average high-temperature is 75.9°F (24.4°C), and the average low-temperature is 57.9°F (14.4°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in July is estimated at 86°F (30°C).

What is the average humidity in September?

In Arrowsmith, the average relative humidity in September is 76%.

How much does it rain in September?

In Arrowsmith, in September, it is raining for 11.6 days, with typically 1.38" (35mm) of accumulated precipitation.

When it does not snow?

In Arrowsmith, snow does not fall in May through October.

What is the average length of the day in September?

The average day length in September is 12h and 27min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:37 pm CDT.

How many hours of sunshine does Arrowsmith have in September?

In Arrowsmith, Illinois, the average sunshine duration in September is 9h.

What is the UV index reading in September?

In Arrowsmith, Illinois, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk 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
Arrowsmith, IL

Average temperature in September - Arrowsmith, IL
  • Average high temperature in September: 75.9°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (31.3°F).

  • Average low temperature in September: 57.9°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

Average pressure in September
Arrowsmith, IL

Average pressure in September - Arrowsmith, IL
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in September
Arrowsmith, IL

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

The windiest month (with the highest average wind speed) is January (11mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in September
Arrowsmith, IL

Average humidity in September - Arrowsmith, IL
  • Average humidity in September: 76%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Arrowsmith, IL

Average rainfall in September - Arrowsmith, IL
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is December (1.1").

Average rainfall days in September
Arrowsmith, IL

Average rainfall days in September - Arrowsmith, IL
  • Average rainfall days in September: 11.6 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (5.8 days).

Average snowfall in September
Arrowsmith, IL

Average snowfall in September - Arrowsmith, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Arrowsmith, IL

Average snowfall days in September - Arrowsmith, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.8 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
Arrowsmith, IL

Average daylight in September / Average sunshine in September - Arrowsmith, 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 0min

The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in September
Arrowsmith, IL

Average sunshine days in September - Arrowsmith, IL
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is June (10.3 days).

Average UV index in September
Arrowsmith, IL

Average UV index in September - Arrowsmith, IL
  • Average UV index in September: 5

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

Average cloud cover in September
Arrowsmith, IL

Average cloud cover in September - Arrowsmith, IL
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 31).

Average visibility in September
Arrowsmith, IL

Average visibility in September - Arrowsmith, IL
  • Average visibility in September: 6mi

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

Arrowsmith, Illinois, USA

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