September weather forecast
Perry, IL

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Weather in September

September, the first month of the autumn in Perry, is also a moderately hot month, with an average temperature ranging between min 58.6°F (14.8°C) and max 78.3°F (25.7°C).

Temperature

The advent of September brings an average high-temperature of a still moderately hot 78.3°F (25.7°C), exhibiting minor difference from the previous month. In the month of September, the nighttime temperature dips to a steady average of 58.6°F (14.8°C).

Humidity

In Perry, the average relative humidity in September is 74%.

Rainfall

In Perry, during September, the rain falls for 10.5 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, there are 128.8 rainfall days, and 18.35" (466mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:31 am and sunset at 7:33 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:46 pm CDT.

Sunshine

In September, the average sunshine is 9.5h.

UV index

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 ordinary individuals.
Note: The average daily UV index of 5 in September transforms into the following instructions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature, in September, in Perry, is 78.3°F (25.7°C), while the low-temperature averages to 58.6°F (14.8°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, is estimated at 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 Perry, in September, it is raining for 10.5 days, with typically 1.65" (42mm) of accumulated precipitation.

When it does not snow?

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

What is the average length of the day in September?

In Perry, 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 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:46 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September is 9.5h.

What is the UV index intensity in September?

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

Average temperature in September - Perry, IL
  • Average high temperature in September: 78.3°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in September: 58.6°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in September
Perry, IL

Average pressure in September - Perry, 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
Perry, IL

Average wind speed in September - Perry, IL
  • Average wind speed in September: 6.8mph

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 (6mph).

Average humidity in September
Perry, IL

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

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

Average rainfall in September
Perry, IL

Average rainfall in September - Perry, IL
  • Average rainfall in September: 1.65"

The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.75").

Average rainfall days in September
Perry, IL

Average rainfall days in September - Perry, IL
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in September
Perry, IL

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

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Perry, IL

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

The month with the highest number of snowfall days is January (6.3 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
Perry, IL

Average daylight in September / Average sunshine in September - Perry, 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 3min

The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in September
Perry, IL

Average sunshine days in September - Perry, IL
  • Average sunshine days in September: 17.3 days

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is June (12.3 days).

Average UV index in September
Perry, IL

Average UV index in September - Perry, 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
Perry, IL

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

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).

Average visibility in September
Perry, IL

Average visibility in September - Perry, 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).

Perry, Illinois, USA

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