September weather forecast
Saint Robert, MO

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Weather in September

September, the first month of the autumn in Saint Robert, is also a moderately hot month, with an average temperature ranging between max 80.4°F (26.9°C) and min 59.4°F (15.2°C).

Temperature

September implies a soft temperature shift, with average high-temperatures reducing from August's hot 87.3°F (30.7°C) to a warm 80.4°F (26.9°C). Saint Robert registers a consistent average low-temperature of 59.4°F (15.2°C) during September.

Humidity

August through October, with an average relative humidity of 73%, are the least humid months in Saint Robert.

Rainfall

In Saint Robert, in September, it is raining for 12.1 days, with typically 2.01" (51mm) of accumulated precipitation. In Saint Robert, during the entire year, the rain falls for 147.7 days and collects up to 31.46" (799mm) of precipitation.

Snowfall

In Saint Robert, snow does not fall in June through September.

Daylight

In Saint Robert, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:39 am and sunset at 7:37 pm. On the last day of September, in Saint Robert, sunrise is at 7:04 am and sunset at 6:52 pm CDT.

Sunshine

In September, the average sunshine is 9.5h.

UV index

In Saint Robert, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Updated: Jun 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

The high-temperature, in September, in Saint Robert, records 80.4°F (26.9°C), while the low-temperature is 59.4°F (15.2°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 100.4°F (38°C).

What is the least humid month?

The months with the lowest humidity are August through October, with an average relative humidity of 73%.

What is the average humidity in September?

The average relative humidity in September in Saint Robert is 73%.

How many days does it rain in September?

In Saint Robert, during September, the rain falls for 12.1 days and regularly aggregates up to 2.01" (51mm) of precipitation.

When it does not snow?

In Saint Robert, snow does not fall in June through September.

Does it snow in September?

In Saint Robert, in September, it doesn't snow. In October, it regularly snows.

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

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

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:39 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm CDT.

How long on average sun shines in September?

The average sunshine duration in September is 9.5h.

What is the UV index intensity in September?

In Saint Robert, Missouri, 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 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 Robert, MO

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

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (40.3°F).

  • Average low temperature in September: 59.4°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 (25°F).

Average pressure in September
Saint Robert, MO

Average pressure in September - Saint Robert, MO
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Saint Robert, MO

Average wind speed in September - Saint Robert, MO
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in September
Saint Robert, MO

Average humidity in September - Saint Robert, MO
  • Average humidity in September: 73%

The months with the highest relative humidity are March and May (77%).
The months with the lowest relative humidity are August, September and October (73%).

Average rainfall in September
Saint Robert, MO

Average rainfall in September - Saint Robert, MO
  • Average rainfall in September: 2.01"

The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is January (1.61").

Average rainfall days in September
Saint Robert, MO

Average rainfall days in September - Saint Robert, MO
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is December (7.5 days).

Average snowfall in September
Saint Robert, MO

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

The month with the highest snowfall is February (3.54").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Saint Robert, MO

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

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Saint Robert, MO

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

The month with the longest days is June (Average daylight: 14h and 42min).
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 months with the least sunshine are January and February (Average sunshine: 4h and 54min).

Average sunshine days in September
Saint Robert, MO

Average sunshine days in September - Saint Robert, MO
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is May (11.7 days).

Average UV index in September
Saint Robert, MO

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

Average cloud cover in September - Saint Robert, MO
  • Average cloud cover in September: 30

The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 28).

Average visibility in September
Saint Robert, MO

Average visibility in September - Saint Robert, 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).

Saint Robert, Missouri, USA

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