September weather forecast
Saint Ann, MO

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Weather in September

September, the first month of the autumn in Saint Ann, is also a moderately hot month, with an average temperature varying between 79.7°F (26.5°C) and 60.1°F (15.6°C).

Temperature

As September arrives, Saint Ann's weather displays a minor decrease in high-temperatures, transitioning from August's warm 85.5°F (29.7°C) to a still moderately hot 79.7°F (26.5°C). During September, Saint Ann's temperature averages to a moderate 60.1°F (15.6°C) at night.

Humidity

The average relative humidity in September is 73%.

Rainfall

In Saint Ann, in September, it is raining for 12.3 days, with typically 1.73" (44mm) of accumulated precipitation. Throughout the year, in Saint Ann, Missouri, there are 141.9 rainfall days, and 27.68" (703mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in September in Saint Ann is 12h and 26min.
On the first day of September, sunrise is at 6:31 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm CDT.

Sunshine

The average sunshine in September in Saint Ann is 9.6h.

UV index

In Saint Ann, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: An average maximum UV index of 5 in September leads to these recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. 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.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Saint Ann in September?

An average high-temperature, in September, in Saint Ann, is 79.7°F (26.5°C) and the average low-temperature is 60.1°F (15.6°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is evaluated at 95°F (35°C).

What is the average humidity in September in Saint Ann?

The average relative humidity in September is 73%.

How much does it rain in Saint Ann in September?

In Saint Ann, Missouri, in September, during 12.3 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow in Saint Ann?

In Saint Ann, Missouri, snow does not fall in April through October.

What is the average length of the day in September in Saint Ann?

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

When are sunrise and sunset in September in Saint Ann?

On the first day of September, sunrise is at 6:31 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm CDT.

How many hours of sunshine does Saint Ann have in September?

The average sunshine duration in September in Saint Ann is 9.6h.

What is the UV index intensity in September in Saint Ann?

In September, the average daily maximum UV index in Saint Ann is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
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
Saint Ann, MO

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

The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (37.2°F).

  • Average low temperature in September: 60.1°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in September
Saint Ann, MO

Average pressure in September - Saint Ann, 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
Saint Ann, MO

Average wind speed in September - Saint Ann, MO
  • Average wind speed in September: 6.1mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).

Average humidity in September
Saint Ann, MO

Average humidity in September - Saint Ann, 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 (70%).

Average rainfall in September
Saint Ann, MO

Average rainfall in September - Saint Ann, MO
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is February (1.42").

Average rainfall days in September
Saint Ann, MO

Average rainfall days in September - Saint Ann, MO
  • Average rainfall days in September: 12.3 days

The month with the highest number of rainy days is July (16.3 days).
The months with the least rainy days are February and December (7.3 days).

Average snowfall in September
Saint Ann, MO

Average snowfall in September - Saint Ann, MO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.05").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Saint Ann, MO

Average snowfall days in September - Saint Ann, MO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (6.8 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
Saint Ann, MO

Average daylight in September / Average sunshine in September - Saint Ann, 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 month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

Average sunshine days in September
Saint Ann, MO

Average sunshine days in September - Saint Ann, MO
  • Average sunshine days in September: 15.3 days

The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in September
Saint Ann, MO

Average UV index in September - Saint Ann, 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
Saint Ann, MO

Average cloud cover in September - Saint Ann, 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
Saint Ann, MO

Average visibility in September - Saint Ann, 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).

Saint Ann, Missouri, USA

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