September weather forecast and climate
Trenton, MO

September, the first month of the autumn, in Trenton, is also a moderately hot month, with average temperature fluctuating between 57.4°F (14.1°C) and 77.4°F (25.2°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 82.9°F (28.3°C) in August, to a still moderately hot 77.4°F (25.2°C). In Trenton, in September, the average low-temperature is 57.4°F (14.1°C).

Humidity

In Trenton, the average relative humidity is 76%.

Rainfall

In Trenton, it is raining for 11.3 days, with typically 2.52" (64mm) of accumulated precipitation. In Trenton, Missouri, during the entire year, the rain falls for 131.5 days and collects up to 26.85" (682mm) of precipitation.

Snowfall

In Trenton snow does not fall in June through September.

Daylight

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

Sunshine

The average sunshine in Trenton, Missouri, is 9.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Trenton?

In September, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 57.4°F (14.1°C).

What is the average humidity in September in Trenton?

The average relative humidity in September in Trenton is 76%.

How many days does it rain in September in Trenton?

In Trenton, Missouri, during September, the rain falls for 11.3 days and regularly aggregates up to 2.52" (64mm) of precipitation.

Does it snow in Trenton in September?

In Trenton, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Trenton?

June through September are months without snowfall in Trenton, Missouri.

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

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

How many hours of sunshine does Trenton have in September?

The average sunshine in September is 9.2h.

How high is the UV index in September in Trenton?

In Trenton, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in September - Trenton, MO
  • Average high temperature in September: 25.2°C

The warmest month (with the highest average high temperature) is July (29.2°C).
The month with the lowest average high temperature is January (0.6°C).

  • Average low temperature in September: 14.1°C

The month with the highest average low temperature is July (19.5°C).
The coldest month (with the lowest average low temperature) is January (-7.1°C).

Average pressure in September - Trenton, MO
  • Average pressure in September: 1016.4mbar

The month with the highest atmospheric pressure is January (1021.5mbar).
The month with the lowest atmospheric pressure is June (1012.2mbar).

Average wind speed in September - Trenton, MO
  • Average wind speed in September: 11.8km/h

The windiest month (with the highest average wind speed) is March (16.1km/h).
The calmest month (with the lowest average wind speed) is August (10.3km/h).

Average humidity in September - Trenton, MO
  • Average humidity in September: 76%

The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September - Trenton, MO
  • Average rainfall in September: 64mm

The wettest month (with the highest rainfall) is June (99mm).
The driest month (with the least rainfall) is January (24mm).

Average rainfall days in September - Trenton, MO
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is February (4.4 days).

Average snowfall in September - Trenton, MO
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (94mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September - Trenton, MO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (6.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 4.7h).

Average sunshine days in September - Trenton, MO
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in September - Trenton, 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).

Average cloud cover in September - Trenton, MO
  • Average cloud cover in September: 30

Months with the most cloud cover are January and March (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September - Trenton, MO
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).