September weather forecast
Serena, IL

Weather in September

September, the first month of the autumn in Serena, is still a warm month, with an average temperature fluctuating between 56.1°F (13.4°C) and 74.5°F (23.6°C).

Temperature

In Serena, the average high-temperature in September is essentially the same as in August - a still moderately hot 74.5°F (23.6°C). In September, the average low-temperature is 56.1°F (13.4°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Serena, Illinois, during 7.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. In Serena, during the entire year, the rain falls for 97.4 days and collects up to 8.07" (205mm) of precipitation.

Snowfall

May through September are months without snowfall in Serena.

Daylight

The average length of the day in September in Serena is 12h and 28min.
On the first day of September in Serena, Illinois, sunrise is at 6:21 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:39 pm CDT.

Sunshine

In Serena, the average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
[Resources]

FAQ

What is the temperature in September in Serena?

In Serena, Illinois, in September, the average high-temperature is 74.5°F (23.6°C), and the average low-temperature is 56.1°F (13.4°C). in July, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is evaluated at 87.8°F (31°C).

What is the average humidity in September in Serena?

In September, the average relative humidity in Serena is 78%.

How much does it rain in Serena in September?

In Serena, Illinois, during September, the rain falls for 7.5 days and regularly aggregates up to 0.63" (16mm) of precipitation.

When it does not snow in Serena?

In Serena, snow does not fall in May through September.

Does it snow in Serena in September?

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

What is the average length of the day in September in Serena?

In Serena, Illinois, the average day length in September is 12h and 28min.

When are sunrise and sunset in September in Serena?

On the first day of September in Serena, Illinois, sunrise is at 6:21 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:39 pm CDT.

How long on average sun shines in September in Serena?

The average sunshine duration in September in Serena, Illinois, is 8.8h.

What is the UV index intensity in September in Serena?

In September, the average daily maximum UV index is 4. 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 sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Serena, IL

Average temperature in September - Serena, IL
  • Average high temperature in September: 74.5°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in September: 56.1°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

[Resources]

Average pressure in September
Serena, IL

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

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

[Resources]

Average wind speed in September
Serena, IL

Average wind speed in September - Serena, IL
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6mph).

[Resources]

Average humidity in September
Serena, IL

Average humidity in September - Serena, IL
  • Average humidity in September: 78%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (73%).

[Resources]

Average rainfall in September
Serena, IL

Average rainfall in September - Serena, IL
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is May (1.14").
The driest month (with the least rainfall) is November (0.35").

[Resources]

Average rainfall days in September
Serena, IL

Average rainfall days in September - Serena, IL
  • Average rainfall days in September: 7.5 days

The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is January (3 days).

[Resources]

Average snowfall in September
Serena, IL

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

The month with the highest snowfall is January (0.98").
The months with the least snowfall are May, June, July, August and September (0").

[Resources]

Average snowfall days in September
Serena, IL

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

The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Serena, IL

Average daylight in September / Average sunshine in September - Serena, IL
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 8min).
The month with the shortest days is December (Average daylight: 9h and 14min).

  • Average sunshine in September: 8h and 48min

The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

[Resources]

Average sunshine days in September
Serena, IL

Average sunshine days in September - Serena, IL
  • Average sunshine days in September: 20 days

The month with the most sunshine days is December (23 days).
The month with the least sunshine days is May (14.7 days).

[Resources]

Average UV index in September
Serena, IL

Average UV index in September - Serena, IL
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

[Resources]

Average cloud cover in September
Serena, IL

Average cloud cover in September - Serena, IL
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 33).

[Resources]

Average visibility in September
Serena, IL

Average visibility in September - Serena, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location