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
September marks a gentle change in average high-temperature, declining from August's hot 87.3°F (30.7°C) to a warm 81.7°F (27.6°C). Saint Johns reports a consistent average low-temperature of 61.9°F (16.6°C) throughout September nights.Heat index
The heat index in September is estimated at a tropical 86°F (30°C). Ongoing exposure and activity could lead to a state of exhaustion, with a chance of heat cramps.Keep in mind the heat index values are meant for areas in shade and with light wind. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Humidity
In Saint Johns, Kentucky, the average relative humidity in September is 72%.Rainfall
September is the month with the least rainfall in Saint Johns. Rain falls for 8.6 days and accumulates 0.63" (16mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 24min.On the first day of September, sunrise is at 6:26 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:39 pm CDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In Saint Johns, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: In September, a regular UV index of 5 translates into these guidelines:
Guard yourself - An obligation to protect skin and eyes from harm exists. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Frequently asked questions
What are the temperatures in Saint Johns in September?
What is the average humidity in September in Saint Johns?
What is the driest month in Saint Johns?
How much does it rain in Saint Johns in September?
When it does not snow in Saint Johns?
How many hours of daylight does Saint Johns have in September?
When are sunrise and sunset in September in Saint Johns?
How many hours of sunshine does Saint Johns have in September?
What is the UV index reading in September in Saint Johns?
Average temperature in September
Saint Johns, KY
- Average high temperature in September: 81.7°F
The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).
Average pressure in September
Saint Johns, KY
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Saint Johns, KY
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in September
Saint Johns, KY
- Average humidity in September: 72%
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Saint Johns, KY
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is September (0.63").
Average rainfall days in September
Saint Johns, KY
- Average rainfall days in September: 8.6 days
The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is October (7.6 days).
Average snowfall in September
Saint Johns, KY
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Saint Johns, KY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.3 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
Saint Johns, 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 42min).
- Average sunshine in September: 9h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Saint Johns, KY
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is October (22.3 days).
The month with the least sunshine days is July (14.2 days).
Average UV index in September
Saint Johns, KY
- Average UV index in September: 5
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 and December (UV index 2).
Average cloud cover in September
Saint Johns, KY
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are June and September (Cloud cover 28).
Average visibility in September
Saint Johns, KY
- 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).
Saint Johns, Kentucky, USA
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