September weather forecast
Vienna, MO

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Weather in September

September, the first month of the autumn in Vienna, is still a warm month, with an average temperature fluctuating between 59°F (15°C) and 80.4°F (26.9°C).

Temperature

The commencement of September indicates a gentle shift in the average high-temperature, receding from August's tropical 87.3°F (30.7°C) to a warm 80.4°F (26.9°C). Vienna, in September, witnesses an average low-temperature of 59°F (15°C).

Humidity

The average relative humidity in September is 73%.

Rainfall

In Vienna, during September, the rain falls for 12.1 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, there are 147.2 rainfall days, and 31.02" (788mm) of precipitation is accumulated.

Snowfall

In Vienna, snow does not fall in May through September.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:51 pm CDT.

Sunshine

The average sunshine in September is 9.5h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily high UV index of 5 in September leads to these guidelines:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

In September, in Vienna, the average high-temperature is 80.4°F (26.9°C), and the average low-temperature is 59°F (15°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is evaluated at 100.4°F (38°C).

What is the average humidity in September?

The average relative humidity in September is 73%.

How much does it rain in September?

In Vienna, during September, the rain falls for 12.1 days and regularly aggregates up to 1.93" (49mm) of precipitation.

When it does not snow?

In Vienna, snow does not fall in May through September.

Does it snow in September?

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

How many hours of daylight does Vienna have in September?

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

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September is 9.5h.

What is the UV index reading in September?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat 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
Vienna, MO

Average temperature in September - Vienna, MO
  • Average high temperature in September: 80.4°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (39.2°F).

  • Average low temperature in September: 59°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (24.4°F).

Average pressure in September
Vienna, MO

Average pressure in September - Vienna, 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
Vienna, MO

Average wind speed in September - Vienna, MO
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in September
Vienna, MO

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

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

Average rainfall in September
Vienna, MO

Average rainfall in September - Vienna, MO
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is November (1.65").

Average rainfall days in September
Vienna, MO

Average rainfall days in September - Vienna, MO
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is December (7 days).

Average snowfall in September
Vienna, MO

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

The month with the highest snowfall is February (3.46").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Vienna, MO

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

The month with the highest number of snowfall days is January (7.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Vienna, 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 36min).

  • Average sunshine in September: 9h and 3min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in September
Vienna, MO

Average sunshine days in September - Vienna, MO
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (11.4 days).

Average UV index in September
Vienna, MO

Average UV index in September - Vienna, 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, November and December (UV index 2).

Average cloud cover in September
Vienna, MO

Average cloud cover in September - Vienna, MO
  • Average cloud cover in September: 31

The months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in September
Vienna, MO

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

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Vienna, Missouri, USA

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