September weather forecast
Hazelwood, MO

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Weather in September

September officially ushers in autumn in Hazelwood, Missouri. With temperatures dropping to a high of 79.7°F (26.5°C), autumnal hues start to take over the city. Although the weather remains warm, the decrease in humidity and normalization of wind speeds signify the retreat of the scorching summer months.

Temperature

The average high-temperature slightly decreases in September, shifting from a moderately hot 85.5°F (29.7°C) in August to a still warm 79.7°F (26.5°C). Hazelwood's temperature lowers to a mean of 60.1°F (15.6°C) during the nights in September.

Humidity

The average relative humidity in September in Hazelwood, Missouri, is 73%.

Rainfall

In Hazelwood, in September, it is raining for 12.3 days, with typically 1.73" (44mm) of accumulated precipitation. In Hazelwood, during the entire year, the rain falls for 141.9 days and collects up to 27.68" (703mm) of precipitation.

Snowfall

April through October are months without snowfall in Hazelwood.

Daylight

In Hazelwood, Missouri, the average length of the day in September is 12h and 26min.
On the first day of September in Hazelwood, 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 Hazelwood is 9.6h.

UV index

The average daily maximum UV index in September in Hazelwood, Missouri, is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: An average maximum UV index of 5 in September leads to these recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
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Frequently asked questions

What is the temperature in September in Hazelwood?

Hazelwood in September has an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 60.1°F (15.6°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 95°F (35°C).

What is the average humidity in September in Hazelwood?

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

How much does it rain in Hazelwood in September?

In September, in Hazelwood, Missouri, the rain falls for 12.3 days. Throughout September, 1.73" (44mm) of precipitation is accumulated.

When it does not snow in Hazelwood?

April through October are months without snowfall in Hazelwood.

How many hours of daylight does Hazelwood have in September?

In Hazelwood, Missouri, the average day length in September is 12h and 26min.

What time are sunrise and sunset in September in Hazelwood?

On the first day of September in Hazelwood, 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 long on average sun shines in September in Hazelwood?

The average sunshine duration in September in Hazelwood is 9.6h.

What is the UV index reading in September in Hazelwood?

In Hazelwood, Missouri, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk 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
Hazelwood, MO

Average temperature in September - Hazelwood, 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).

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Average pressure in September
Hazelwood, MO

Average pressure in September - Hazelwood, 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
Hazelwood, MO

Average wind speed in September - Hazelwood, 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).

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Average humidity in September
Hazelwood, MO

Average humidity in September - Hazelwood, 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%).

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Average rainfall in September
Hazelwood, MO

Average rainfall in September - Hazelwood, 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").

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Average rainfall days in September
Hazelwood, MO

Average rainfall days in September - Hazelwood, 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).

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Average snowfall in September
Hazelwood, MO

Average snowfall in September - Hazelwood, 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").

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Average snowfall days in September
Hazelwood, MO

Average snowfall days in September - Hazelwood, 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).

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

Average daylight in September / Average sunshine in September - Hazelwood, 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).

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Average sunshine days in September
Hazelwood, MO

Average sunshine days in September - Hazelwood, 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).

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Average UV index in September
Hazelwood, MO

Average UV index in September - Hazelwood, 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
Hazelwood, MO

Average cloud cover in September - Hazelwood, 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
Hazelwood, MO

Average visibility in September - Hazelwood, 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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Hazelwood, Missouri, USA

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