September weather forecast
Hillview, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Hillview, Illinois, with an average temperature varying between 78.1°F (25.6°C) and 59.2°F (15.1°C).

Temperature

In Hillview, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's moderately hot 83.5°F (28.6°C) to a still warm 78.1°F (25.6°C). Throughout September, Hillview encounters an average temperature drop to a mild 59.2°F (15.1°C).

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Hillview, in September, it is raining for 11 days, with typically 1.34" (34mm) of accumulated precipitation. In Hillview, during the entire year, the rain falls for 127.3 days and collects up to 17.24" (438mm) of precipitation.

Snowfall

In Hillview, Illinois, snow does not fall in May through October.

Daylight

In Hillview, Illinois, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:31 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:45 pm CDT.

Sunshine

In Hillview, the average sunshine in September is 9.4h.

UV index

In Hillview, Illinois, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: The daily high UV index of 5 during September translates into the following recommendations:
Undertake precautions - Guarding against sun damage is counselled. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Updated: Jun 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Hillview in September?

The high-temperature, in September, in Hillview, is 78.1°F (25.6°C), while the low-temperature averages to 59.2°F (15.1°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, in August is calculated to be 91.4°F (33°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

How many days does it rain in September?

In Hillview, in September, it is raining for 11 days, with typically 1.34" (34mm) of accumulated precipitation.

When it does not snow?

May through October are months without snowfall.

What is the average length of the day in September?

The average day length in September is 12h and 26min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:31 am and sunset at 7:32 pm. On the last day of the month, in Hillview, sunrise is at 6:58 am and sunset at 6:45 pm CDT.

How long on average sun shines in September in Hillview?

The average sunshine duration in September is 9.4h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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
Hillview, IL

Average temperature in September - Hillview, IL
  • Average high temperature in September: 78.1°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in September: 59.2°F

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).

Average pressure in September
Hillview, IL

Average pressure in September - Hillview, 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 (29.91"Hg).

Average wind speed in September
Hillview, IL

Average wind speed in September - Hillview, IL
  • Average wind speed in September: 6.7mph

The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).

Average humidity in September
Hillview, IL

Average humidity in September - Hillview, IL
  • Average humidity in September: 74%

The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Hillview, IL

Average rainfall in September - Hillview, IL
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is June (2.44").
The driest months (with the least rainfall) are January and November (0.83").

Average rainfall days in September
Hillview, IL

Average rainfall days in September - Hillview, IL
  • Average rainfall days in September: 11 days

The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (5.5 days).

Average snowfall in September
Hillview, IL

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

The month with the highest snowfall is February (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Hillview, IL

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

The month with the highest number of snowfall days is January (7.2 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
Hillview, IL

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in September
Hillview, IL

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

The month with the most sunshine days is December (20.6 days).
The month with the least sunshine days is July (12.3 days).

Average UV index in September
Hillview, IL

Average UV index in September - Hillview, 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
Hillview, IL

Average cloud cover in September - Hillview, IL
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 29).

Average visibility in September
Hillview, IL

Average visibility in September - Hillview, 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).

Hillview, Illinois, USA

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