September weather forecast
Killarney, FL

Share

Weather in September

September, the first month of the autumn in Killarney, is also a hot month, with an average temperature fluctuating between 88.7°F (31.5°C) and 74.1°F (23.4°C).

Temperature

The arrival of September brings an average high-temperature of a still hot 88.7°F (31.5°C), subtly diverging from August's 91°F (32.8°C). In Killarney, the nighttime temperature averages to a moderately hot 74.1°F (23.4°C) during September.

Heat index

During September, the heat index is appraised at a scorching 107.6°F (42°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a value derived by merging air temperature with the humidity to convey how the climate feels. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

September is the most humid month, with an average relative humidity of 78%.

Rainfall

In Killarney, in September, it is raining for 24.6 days, with typically 4.72" (120mm) of accumulated precipitation. In Killarney, during the entire year, the rain falls for 205.7 days and collects up to 41.1" (1044mm) of precipitation.

Snowfall

February through December are months without snowfall.

Daylight

In September, the average length of the day is 12h and 19min.
On the first day of the month, sunrise is at 7:05 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:19 am and sunset at 7:13 pm EDT.

Sunshine

In September, the average sunshine is 8.6h.

UV index

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Updated: Aug 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in September?

An average high-temperature, in September, in Killarney, is 88.7°F (31.5°C) and the average low-temperature is 74.1°F (23.4°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is appraised at 107.6°F (42°C).

What is the most humid month?

The most humid month is September, with an average relative humidity of 78%.

What is the average humidity in September?

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

How many days does it rain in September?

In Killarney, during September, the rain falls for 24.6 days and regularly aggregates up to 4.72" (120mm) of precipitation.

When it does not snow in Killarney?

February through December are months without snowfall.

What is the average length of the day in September?

The average day length in September is 12h and 19min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 7:05 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:13 pm EDT.

How many hours of sunshine does Killarney have in September?

In September, the average sunshine duration is 8.6h.

How high is the UV index in September?

In Killarney, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Killarney, FL

Average temperature in September - Killarney, FL
  • Average high temperature in September: 88.7°F

The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is January (67.6°F).

  • Average low temperature in September: 74.1°F

The month with the highest average low temperature is August (76.5°F).
The coldest month (with the lowest average low temperature) is January (50.4°F).

Average pressure in September
Killarney, FL

Average pressure in September - Killarney, FL
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).

Average wind speed in September
Killarney, FL

Average wind speed in September - Killarney, FL
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest month (with the lowest average wind speed) is July (4.6mph).

Average humidity in September
Killarney, FL

Average humidity in September - Killarney, FL
  • Average humidity in September: 78%

The month with the highest relative humidity is September (78%).
The month with the lowest relative humidity is March (71%).

Average rainfall in September
Killarney, FL

Average rainfall in September - Killarney, FL
  • Average rainfall in September: 4.72"

The wettest month (with the highest rainfall) is July (6.81").
The driest months (with the least rainfall) are January and March (1.5").

Average rainfall days in September
Killarney, FL

Average rainfall days in September - Killarney, FL
  • Average rainfall days in September: 24.6 days

The month with the highest number of rainy days is August (28.4 days).
The month with the least rainy days is January (9.8 days).

Average snowfall days in September
Killarney, FL

Average snowfall days in September - Killarney, FL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in September /
Average sunshine in September
Killarney, FL

Average daylight in September / Average sunshine in September - Killarney, FL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).

  • Average sunshine in September: 8h and 4min

The months with the most sunshine are May and July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).

Average sunshine days in September
Killarney, FL

Average sunshine days in September - Killarney, FL
  • Average sunshine days in September: 3.7 days

The month with the most sunshine days is January (18.1 days).
The month with the least sunshine days is August (1.3 days).

Average UV index in September
Killarney, FL

Average UV index in September - Killarney, FL
  • Average UV index in September: 6

The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 4).

Average cloud cover in September
Killarney, FL

Average cloud cover in September - Killarney, FL
  • Average cloud cover in September: 33

The months with the most cloud cover are January and February (Cloud cover 37).
The month with the least cloud cover is May (Cloud cover 29).

Average visibility in September
Killarney, FL

Average visibility in September - Killarney, FL
  • 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).

Killarney, Florida, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location