Louisville
Kentucky, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Louisville, KY

A distant view of the Louisville city, Kentucky, from across the bridge, at dusk, reflected in the water below
A distant view of the Louisville city, Kentucky, from across the bridge, at dusk, reflected in the water below
August, the last month of the summer, in Louisville, is another tropical month, with average temperature varying between 68.5°F (20.3°C) and 88.3°F (31.3°C).

Temperature

In August, the average high-temperature is relatively the same as in July - a still hot 88.3°F (31.3°C). The average low-temperature, in August, is 68.5°F (20.3°C).

Heat index

In August, the average heat index is appraised at a torrid 102.2°F (39°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like metabolic differences, clothing, wind, 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity is 71.7%.

Rainfall

In Louisville, in August, during 8 rainfall days, 3.3" (84.6mm) of precipitation is typically accumulated. Throughout the year, there are 122.8 rainfall days, and 44.9" (1140.9mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In August, the average length of the day is 13.6h.

Sunshine

In August, the average sunshine in Louisville is 8.8h.

UV index

June through August, with an average maximum UV index of 9, are months with the highest UV index in Louisville, Kentucky. A UV Index reading of 8 to 10 represents a very high health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the average maximum UV index of 9 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.

What is the temperature in August in Louisville?

The average high-temperature, in August, is 88.3°F (31.3°C), while the average low-temperature is 68.5°F (20.3°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), that factores the actual air temperature with the relative humidity, is evaluated at 102.2°F (39°C).

What is the average humidity in August in Louisville?

In August, the average relative humidity in Louisville, Kentucky, is 71.7%.

How much does it rain in Louisville in August?

In Louisville, in August, it is raining for 8 days, with typically 3.3" (84.6mm) of accumulated precipitation.

When it does not snow in Louisville?

May through September are months without snowfall in Louisville, Kentucky.

What is the average length of the day in August in Louisville?

The average length of the day in August in Louisville is 13.6h.

How long on average sun shines in August in Louisville?

In August, the average sunshine in Louisville is 8.8h.

When is the highest UV index in Louisville?

June through August, with an average maximum UV index of 9, are months with the highest UV index.

What is the UV index intensity in August in Louisville?

In August, the average daily maximum UV index in Louisville is 9. A UV Index of 8 to 10 symbolizes a very high health risk from unprotected exposure to the UV radiation.
Average temperature in August - Louisville, KY
  • Average high temperature in August: 88.3°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 (43°F).

  • Average low temperature in August: 68.5°F

The month with the highest average low temperature is July (69.9°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

Average humidity in August - Louisville, KY
  • Average humidity in August: 71.7%

The month with the highest relative humidity is September (72.9%).
The month with the lowest relative humidity is April (61.5%).

Average rainfall in August - Louisville, KY
  • Average rainfall in August: 3.3"

The wettest month (with the highest rainfall) is May (5.3").
The driest month (with the lowest rainfall) is September (3.1").

Average rainfall days in August - Louisville, KY
  • Average rainfall days in August: 8 days

The month with the highest number of rainy days is May (12.6 days).
The month with the lowest number of rainy days is October (7.7 days).

Average snowfall in August - Louisville, KY
  • Average snowfall in August: 0"

The month with the highest snowfall is February (4.5").
Months with the lowest snowfall are May, June, July, August and September (0").

Average snowfall days in August - Louisville, KY
  • Average snowfall days in August: 0 days

Months with the highest number of snowfall days are January and February (3.6 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in August / Average sunshine in August - Louisville, KY
  • Average daylight in August: 13.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in August: 8.8h

The month with most sunshine is June (Average sunshine: 9.6h).
The month with least sunshine is December (Average sunshine: 3.8h).

Average UV index in August - Louisville, KY
  • Average UV index in August: 9

Months with the highest UV index are June, July and August (UV index 9).
Months with the lowest UV index are January and December (UV index 2).