September weather forecastKillarney, FL
September
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 12h and 18min
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 36min
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: 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: 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: 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: 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).
