Jefferson City
Missouri, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Jefferson City, MO

The scenic view of the State Capitol building in Jefferson City, Missouri, surrounded by a beautiful park, reflected in a pool of water nearby
The scenic view of the State Capitol building in Jefferson City, Missouri, surrounded by a beautiful park, reflected in a pool of water nearby
September, the first month of the autumn, in Jefferson City, is also a moderately hot month, with average temperature fluctuating between 59.2°F (15.1°C) and 80.1°F (26.7°C).

Temperature

In Jefferson City, the average high-temperature in September slightly decreases, from a tropical 87.4°F (30.8°C) in August, to a moderately hot 80.1°F (26.7°C). In Jefferson City, the average low-temperature is 59.2°F (15.1°C).

Humidity

In September, the average relative humidity is 73%.

Rainfall

In Jefferson City, in September, during 7 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. Throughout the year, in Jefferson City, there are 93.7 rainfall days, and 9.29" (236mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In Jefferson City, Missouri, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 9.5h.

UV index

In Jefferson City, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health 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 sun damage is advised. 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 Jefferson City?

The average high-temperature, in September, in Jefferson City, Missouri, is 80.1°F (26.7°C), while the average low-temperature is 59.2°F (15.1°C).

What is the average humidity in September in Jefferson City?

In September, the average relative humidity in Jefferson City is 73%.

How many days does it rain in September in Jefferson City?

In Jefferson City, during September, the rain falls for 7 days and regularly aggregates up to 0.55" (14mm) of precipitation.

When it does not snow in Jefferson City?

In Jefferson City snow does not fall in April through October.

How many hours of daylight does Jefferson City have in September?

In Jefferson City, the average length of the day in September is 12.4h.

How long on average sun shines in September in Jefferson City?

The average sunshine in September is 9.5h.

What is the UV index reading in September in Jefferson City?

In September, the average daily maximum UV index in Jefferson City, Missouri, is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.
Average temperature in September - Jefferson City, MO
  • Average high temperature in September: 26.7°C

The warmest month (with the highest average high temperature) is July (31.8°C).
The month with the lowest average high temperature is January (3.6°C).

  • Average low temperature in September: 15.1°C

The month with the highest average low temperature is July (19.9°C).
The coldest month (with the lowest average low temperature) is January (-4.3°C).

Average humidity in September - Jefferson City, MO
  • Average humidity in September: 73%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is October (72%).

Average rainfall in September - Jefferson City, MO
  • Average rainfall in September: 14mm

The wettest month (with the highest rainfall) is May (33mm).
The driest month (with the lowest rainfall) is November (12mm).

Average rainfall days in September - Jefferson City, MO
  • Average rainfall days in September: 7 days

The month with the highest number of rainy days is May (11.3 days).
The month with the lowest number of rainy days is January (4 days).

Average snowfall in September - Jefferson City, MO
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (18mm).
Months with the lowest snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in September - Jefferson City, MO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.2 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Jefferson City, MO
  • Average daylight in September: 12.4h

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 September: 9.5h

The month with most sunshine is June (Average sunshine: 10.6h).
The month with least sunshine is February (Average sunshine: 4.8h).

Average UV index in September - Jefferson City, MO
  • Average UV index in September: 5

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