Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With September's onset, the weather reveals a slight temperature decrease, transitioning from a hot 87.3°F (30.7°C) in August to a moderately hot 80.4°F (26.9°C). Saint Robert's temperature tends to fall to an average low of 59.4°F (15.2°C) during the nights of September.Humidity
The months with the lowest humidity are August through October, with an average relative humidity of 73%.Rainfall
In Saint Robert, during September, the rain falls for 12.1 days and regularly aggregates up to 2.01" (51mm) of precipitation. Throughout the year, in Saint Robert, there are 147.7 rainfall days, and 31.46" (799mm) of precipitation is accumulated.Snowfall
In Saint Robert, snow does not fall in June through September.Daylight
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, sunrise is at 7:04 am and sunset at 6:52 pm CDT.
Sunshine
In September, the average sunshine in Saint Robert is 9.5h.UV index
In Saint Robert, Missouri, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 5 in September transforms into this advice:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Frequently asked questions
What is the average September temperature in Saint Robert?
What are the least humid months in Saint Robert?
What is the average humidity in September in Saint Robert?
How many days does it rain in September in Saint Robert?
When it does not snow in Saint Robert?
Does it snow in Saint Robert in September?
What is the average length of the day in September in Saint Robert?
What time are sunrise and sunset in September in Saint Robert?
How long on average sun shines in September in Saint Robert?
What is the UV index intensity in September in Saint Robert?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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