September Weather in Louisville

Last updated: March 2, 2024

The weather in Louisville, United States, during September is characterized by an average temperature of 26°C (79°F). Highs can soar to 37°C (98°F), while lows may dip to 15°C (59°F). Typically, the humidity level in Louisville throughout September hovers around 82%.

15°C (59°F)

Minimum temperature

26°C (79°F)

Average temperature

37°C (98°F)

Maximum temperature

82%

Humidity

Precipitation and Sunshine hours

In September, Louisville averages 83 mm (3.3 inches) of rainfall, typically over the course of 8 rainy days. The month enjoys an average of 12 hours 19 minutes of daylight, with the sun shining for approximately 9 hours 58 minutes each day. Additionally, there is a 50% probability of sunny days during this period.

83 mm (3.3 inches)

Precipitation

8 rainy days

Rainy days

9 hours 58 minutes

Sunshine hours

50%

Chance of sun

UV Index

In September, the UV Index in Louisville reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00
UVI	0	1	2	4	6	8	9	9	8	5	3	1	1
Exposure	Low			Moderate	High	VeryHigh				Moderate		Low
Time to burn	45 min			30 min	25 min	15 min				30 min		45 min