Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
A subtle change in temperatures is noted as August gives way to September, with average highs reducing from 84.7°F (29.3°C) to a still warm 78.6°F (25.9°C). In September, Mount Vernon experiences a temperature dip to an average of 58.1°F (14.5°C) at night.Humidity
The months with the lowest humidity are June, August through November, with an average relative humidity of 76%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.6 days and typically collects 2.44" (62mm) of precipitation.Snowfall
In Mount Vernon, snow does not fall in May through September.Daylight
In Mount Vernon, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 7:08 am and sunset at 8:05 pm. On the last day of September, sunrise is at 7:32 am and sunset at 7:21 pm EDT.
Sunshine
In September, the average sunshine is 8.2h.UV index
In Mount Vernon, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What are the least humid months?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Mount Vernon have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Mount Vernon, KY
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (40.3°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (27°F).
Average pressure in September
Mount Vernon, KY
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Mount Vernon, KY
- Average wind speed in September: 5mph
The windiest months (with the highest average wind speed) are January and February (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Mount Vernon, KY
- Average humidity in September: 76%
The months with the highest relative humidity are February and December (80%).
The months with the lowest relative humidity are June, August, September, October and November (76%).
Average rainfall in September
Mount Vernon, KY
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is February (4.13").
The driest month (with the least rainfall) is September (2.44").
Average rainfall days in September
Mount Vernon, KY
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is July (19 days).
The month with the least rainy days is January (11.8 days).
Average snowfall in September
Mount Vernon, KY
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.98").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Mount Vernon, KY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.8 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
Mount Vernon, KY
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Mount Vernon, KY
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is November (16 days).
The month with the least sunshine days is February (9.7 days).
Average UV index in September
Mount Vernon, KY
- Average UV index in September: 4
The months with the highest UV index are May, 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
Mount Vernon, KY
- Average cloud cover in September: 34
The months with the most cloud cover are January and February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Mount Vernon, KY
- Average visibility in September: 5mi
The months with the highest visibility are April, June, August, October and November (6mi).
The months with the lowest visibility are January, February, March, May, July, September and December (5mi).
Mount Vernon, Kentucky, USA
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