September weather forecast and climate
Altona, KY

The first month of the autumn, September, is still a warm month in Altona, Kentucky, with average temperature varying between 61.9°F (16.6°C) and 81.5°F (27.5°C).

Temperature

In September, the average high-temperature marginally drops, from a tropical 87.1°F (30.6°C) in August, to a warm 81.5°F (27.5°C). In Altona, in September, the average low-temperature is 61.9°F (16.6°C).

Heat index

In September, the average heat index is evaluated at 85.8°F (29.9°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like differences in body mass, height, and shape, wind, clothing, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in September is 72%.

Rainfall

September is the month with the least rainfall in Altona. Rain falls for 7.1 days and accumulates 0.28" (7mm) of precipitation.

Snowfall

In Altona snow does not fall in April through October.

Daylight

In September, the average length of the day in Altona, Kentucky, is 12.4h.

Sunshine

In September, the average sunshine in Altona is 9.3h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Altona?

In Altona, in September, the average high-temperature is 81.5°F (27.5°C), and the average low-temperature is 61.9°F (16.6°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that factores the actual air temperature with the relative humidity, is appraised at 85.8°F (29.9°C).

What is the average humidity in September in Altona?

In Altona, Kentucky, the average relative humidity in September is 72%.

How many days does it rain in September in Altona?

In Altona, during September, the rain falls for 7.1 days and regularly aggregates up to 0.28" (7mm) of precipitation.

What is the driest month in Altona?

The month with the least rainfall in Altona, Kentucky, is September when the rain falls for 7.1 days and typically collects 0.28" (7mm) of precipitation.

When it does not snow in Altona?

In Altona, Kentucky, snow does not fall in April through October.

What is the average length of the day in September in Altona?

In September, the average length of the day in Altona, Kentucky, is 12.4h.

How many hours of sunshine does Altona have in September?

The average sunshine in September in Altona is 9.3h.

What is the UV index reading in September in Altona?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.
Average temperature in September - Altona, KY
  • Average high temperature in September: 81.5°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (41.7°F).

  • Average low temperature in September: 61.9°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).

Average pressure in September - Altona, KY
  • Average pressure in September: 30.03"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.95").

Average wind speed in September - Altona, KY
  • Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).

Average humidity in September - Altona, KY
  • Average humidity in September: 72%

Months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September - Altona, KY
  • Average rainfall in September: 0.28"

The wettest month (with the highest rainfall) is February (1.06").
The driest month (with the least rainfall) is September (0.28").

Average rainfall days in September - Altona, KY
  • Average rainfall days in September: 7.1 days

The month with the highest number of rainy days is July (10.7 days).
The month with the least rainy days is November (5.7 days).

Average snowfall in September - Altona, KY
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.28").
Months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September - Altona, KY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.1 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Altona, KY
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 9.3h

The month with the most sunshine is July (Average sunshine: 10.6h).
Months with the least sunshine are January and February (Average sunshine: 4.6).

Average sunshine days in September - Altona, KY
  • Average sunshine days in September: 19.7 days

The month with the most sunshine days is October (23.3 days).
The month with the least sunshine days is July (15.7 days).

Average UV index in September - Altona, KY
  • Average UV index in September: 5

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February and December (UV index 2).

Average cloud cover in September - Altona, KY
  • Average cloud cover in September: 28

The month with the most cloud cover is February (Cloud cover 51).
Months with the least cloud cover are June and September (Cloud cover 28).

Average visibility in September - Altona, KY
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).