September weather forecast
Greendale, MO

Share

Weather in September

The first month of the autumn, September, is also a moderately hot month in Greendale, Missouri, with an average temperature ranging between max 79.7°F (26.5°C) and min 60.1°F (15.6°C).

Temperature

September's arrival subtly correlates with a reduction in the average high-temperature, down from 85.5°F (29.7°C) in August to a still warm 79.7°F (26.5°C). Throughout September, Greendale experiences a low-temperature average of 60.1°F (15.6°C).

Humidity

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

Rainfall

In Greendale, Missouri, during September, the rain falls for 12 days and regularly aggregates up to 1.97" (50mm) of precipitation. In Greendale, during the entire year, the rain falls for 144.8 days and collects up to 30.59" (777mm) of precipitation.

Snowfall

In Greendale, snow does not fall in April through October.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September, sunrise is at 6:31 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:45 pm CDT.

Sunshine

The average sunshine in September is 9.6h.

UV index

In Greendale, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: An average UV index of 5 in September transforms into this advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. 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. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

During September, Greendale experiences an average high-temperature of 79.7°F (26.5°C) and a low-temperature of 60.1°F (15.6°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August is estimated at 95°F (35°C).

What is the average humidity in September?

In September, the average relative humidity is 73%.

How many days does it rain in September?

In Greendale, during September, the rain falls for 12 days and regularly aggregates up to 1.97" (50mm) of precipitation.

When it does not snow?

In Greendale, snow does not fall in April through October.

What is the average length of the day in September?

In Greendale, the average day length in September is 12h and 25min.

When is the sunrise / sunset in September?

On the first day of September in Greendale, sunrise is at 6:31 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:45 pm CDT.

How many hours of sunshine does Greendale have in September?

The average sunshine duration in September is 9.6h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Greendale, MO

Average temperature in September - Greendale, MO
  • Average high temperature in September: 79.7°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in September: 60.1°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in September
Greendale, MO

Average pressure in September - Greendale, MO
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in September
Greendale, MO

Average wind speed in September - Greendale, MO
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in September
Greendale, MO

Average humidity in September - Greendale, MO
  • Average humidity in September: 73%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (70%).

Average rainfall in September
Greendale, MO

Average rainfall in September - Greendale, MO
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is February (1.69").

Average rainfall days in September
Greendale, MO

Average rainfall days in September - Greendale, MO
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.5 days).

Average snowfall in September
Greendale, MO

Average snowfall in September - Greendale, MO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.6").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Greendale, MO

Average snowfall days in September - Greendale, MO
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in September /
Average sunshine in September
Greendale, MO

Average daylight in September / Average sunshine in September - Greendale, MO
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 4min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

Average sunshine days in September
Greendale, MO

Average sunshine days in September - Greendale, MO
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is January (21 days).
The month with the least sunshine days is June (11.2 days).

Average UV index in September
Greendale, MO

Average UV index in September - Greendale, MO
  • Average UV index in September: 5

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

Average cloud cover in September
Greendale, MO

Average cloud cover in September - Greendale, MO
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
Greendale, MO

Average visibility in September - Greendale, MO
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Greendale, Missouri, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location