September weather forecastNapoleon, KY
September
Weather in September
The first month of the autumn, September, is still a warm month in Napoleon, Kentucky, with temperature in the range of an average high of 77.9°F (25.5°C) and an average low of 58.5°F (14.7°C).Temperature
September's onset brings a negligible change in high-temperatures, falling from a moderately hot 84.2°F (29°C) in August to a still warm 77.9°F (25.5°C). During the month of September, the temperature in Napoleon falls to an average of 58.5°F (14.7°C).Humidity
August through October, with an average relative humidity of 75%, are the least humid months in Napoleon.Rainfall
The month with the least rainfall in Napoleon is September, when the rain falls for 9.5 days and typically collects 0.55" (14mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In Napoleon, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 7:08 am and sunset at 8:08 pm. On the last day of September, in Napoleon, sunrise is at 7:34 am and sunset at 7:22 pm EDT.
Sunshine
In September, the average sunshine is 8.3h.UV index
In Napoleon, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, a regular UV index of 5 translates into these guidelines:
Undertake protective steps - Preventing sun damage is advised. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Napoleon, KY
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (37.4°F).
- Average low temperature in September: 58.5°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in September
Napoleon, KY
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Napoleon, KY
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Napoleon, KY
- Average humidity in September: 75%
The months with the highest relative humidity are February and December (81%).
The months with the lowest relative humidity are August, September and October (75%).
Average rainfall in September
Napoleon, KY
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is May (1.18").
The driest month (with the least rainfall) is September (0.55").
Average rainfall days in September
Napoleon, KY
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is November (6.8 days).
Average snowfall in September
Napoleon, KY
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.47").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Napoleon, KY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Napoleon, KY
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Napoleon, KY
- Average sunshine days in September: 17.3 days
The months with the most sunshine days are October and November (21 days).
The month with the least sunshine days is May (13.6 days).
Average UV index in September
Napoleon, KY
- 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
Napoleon, KY
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Napoleon, KY
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are May and July (5mi).
