September weather forecastKansas City, MO

Panorama of Kansas City, Missouri in the US, with an old statue of a scout boy looking towards the city

September

Weather in September

September brings a whiff of change in Kansas City's air as the city prepares to bid adieu to summer. The advent of fall gradually replaces the sultry heat with a comfortable chill. As the month progresses, the number of daylight hours shrink, a subtle reminder of the onset of fall. September also marks a decrease in rainfall, providing dry and clear days. With autumn leaves beginning to scatter around, Kansas City witnesses a beautiful changeover.

Temperature

With September's onset, the weather reveals a slight temperature decrease, transitioning from a tropical 88.5°F (31.4°C) in August to a warm 80.1°F (26.7°C). Kansas City sees an average low-temperature of 60.4°F (15.8°C) during September.

Humidity

In Kansas City, Missouri, the average relative humidity in September is 70.4%.

Rainfall

In September, the rain falls for 8.1 days. Throughout September, 4.17" (106mm) of precipitation is accumulated. In Kansas City, during the entire year, the rain falls for 90.8 days and collects up to 39.06" (992mm) of precipitation.

Snowfall

May through September are months without snowfall in Kansas City, Missouri.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:47 am and sunset at 7:48 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:01 pm CDT.

Sunshine

The average sunshine in September is 8h.

UV index

In September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Shun overexposure. Protection from sun ravages is indispensable. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.

Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In September, the average high-temperature and low-temperature are 80.1°F (26.7°C) and 60.4°F (15.8°C) respectively. In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 102.2°F (39°C).

The average relative humidity in September in Kansas City, Missouri, is 70.4%.

In Kansas City, Missouri, during September, the rain falls for 8.1 days and regularly aggregates up to 4.17" (106mm) of precipitation.

In Kansas City, snow does not fall in May through September.

In Kansas City, Missouri, in September, it doesn't snow. In October, it regularly snows.

In September, the average day length is 12h and 26min.

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:01 pm CDT.

In September, the average sunshine duration in Kansas City is 8h.

The average daily maximum UV index in September in Kansas City is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

88.6°F

80°F

67.8°F

Average low temperature

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average UV index

Average temperature in September
Kansas City, MO

Average high temperature in September: 80°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (39.5°F).

Average low temperature in September: 60.5°F

The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (22.4°F).

Average humidity in September
Kansas City, MO

Average humidity in September: 70.4%

The month with the highest relative humidity is December (71%).
The month with the lowest relative humidity is April (62.9%).

Average rainfall in September
Kansas City, MO

Average rainfall in September: 4.2"

The wettest month (with the highest rainfall) is June (5.5").
The driest month (with the least rainfall) is January (1.1").

Average rainfall days in September
Kansas City, MO

Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is May (11 days).
The month with the least rainy days is January (4.8 days).

Average snowfall in September
Kansas City, MO

Average snowfall in September: 0"

The month with the highest snowfall is December (4.4").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Kansas City, MO

Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and December (2.5 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
Kansas City, MO

Average daylight in September: 12h and 24min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

Average sunshine in September: 8h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).