September weather forecast
Des Peres, MO

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Weather in September

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

Temperature

Des Peres's progression into September involves a minor drop in the average high-temperature, slightly receding from a moderately hot 85.5°F (29.7°C) in August to a still warm 79.7°F (26.5°C). During the month of September, an average low-temperature of 60.1°F (15.6°C) is recorded.

Humidity

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

Rainfall

In Des Peres, during September, the rain falls for 12 days and regularly aggregates up to 1.97" (50mm) of precipitation. Throughout the year, there are 144.8 rainfall days, and 30.59" (777mm) of precipitation is accumulated.

Snowfall

In Des Peres, snow does not fall in April through October.

Daylight

In Des Peres, the average length of the day in September is 12h and 25min.
On the first day of September in Des Peres, 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

In Des Peres, the average sunshine in September is 9.6h.

UV index

In Des Peres, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: A typical high UV index of 5 in September suggests the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
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Frequently asked questions

What is the usual temperature for Des Peres in September?

The high-temperature during September is 79.7°F (26.5°C) and the low-temperature is 60.1°F (15.6°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is computed to be 95°F (35°C).

What is the average humidity in September in Des Peres?

The average relative humidity in September in Des Peres is 73%.

How many days does it rain in September in Des Peres?

In September, in Des Peres, the rain falls for 12 days. Throughout September, 1.97" (50mm) of precipitation is accumulated.

When it does not snow in Des Peres?

In Des Peres, Missouri, snow does not fall in April through October.

What is the average length of the day in September in Des Peres?

In September, the average day length in Des Peres, Missouri, is 12h and 25min.

When are sunrise and sunset in September in Des Peres?

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

How long on average sun shines in September in Des Peres?

In Des Peres, Missouri, the average sunshine duration in September is 9.6h.

What is the UV index reading in September in Des Peres?

The average daily maximum UV index in September in Des Peres is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe 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
Des Peres, MO

Average temperature in September - Des Peres, 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).

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Average pressure in September
Des Peres, MO

Average pressure in September - Des Peres, 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).

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Average wind speed in September
Des Peres, MO

Average wind speed in September - Des Peres, 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).

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Average humidity in September
Des Peres, MO

Average humidity in September - Des Peres, 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%).

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Average rainfall in September
Des Peres, MO

Average rainfall in September - Des Peres, 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").

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Average rainfall days in September
Des Peres, MO

Average rainfall days in September - Des Peres, 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).

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Average snowfall in September
Des Peres, MO

Average snowfall in September - Des Peres, 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").

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Average snowfall days in September
Des Peres, MO

Average snowfall days in September - Des Peres, 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).

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Average daylight in September /
Average sunshine in September
Des Peres, MO

Average daylight in September / Average sunshine in September - Des Peres, 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).

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Average sunshine days in September
Des Peres, MO

Average sunshine days in September - Des Peres, 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).

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Average UV index in September
Des Peres, MO

Average UV index in September - Des Peres, 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).

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Average cloud cover in September
Des Peres, MO

Average cloud cover in September - Des Peres, 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).

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Average visibility in September
Des Peres, MO

Average visibility in September - Des Peres, 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).

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Des Peres, Missouri, USA

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