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
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from a tropical 87.4°F (30.8°C) to a warm 80.6°F (27°C). Throughout the month of September, Saint James observes a dramatic downturn from the daytime peak temperatures, expecting an average low of 58.8°F (14.9°C).Heat index
September's average heat index is appraised at 84.2°F (29°C). With unrelenting exposure and activity, one might experience exhaustion, leading to potential heat cramps.Evaluating the heat index requires understanding its values in the shade and with gentle winds. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Humidity
In Saint James, the average relative humidity in September is 74%.Rainfall
In Saint James, in September, during 11.4 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Saint James, during the entire year, the rain falls for 137 days and collects up to 24.61" (625mm) of precipitation.Snowfall
April through October are months without snowfall in Saint James, Missouri.Daylight
In Saint James, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:50 pm CDT.
Sunshine
In September, the average sunshine in Saint James is 9.3h.UV index
In Saint James, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Saint James in September?
What is the average humidity in September in Saint James?
How many days does it rain in September in Saint James?
When it does not snow in Saint James?
What is the average length of the day in September in Saint James?
What time are sunrise and sunset in September in Saint James?
How many hours of sunshine does Saint James have in September?
What is the UV index intensity in September in Saint James?
Average temperature in September
Saint James, MO
- Average high temperature in September: 80.6°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 (39.6°F).
- Average low temperature in September: 58.8°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in September
Saint James, 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
Saint James, MO
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in September
Saint James, MO
- Average humidity in September: 74%
The month with the highest relative humidity is March (78%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Saint James, MO
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is April (3.19").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days in September
Saint James, MO
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is January (6.5 days).
Average snowfall in September
Saint James, MO
- Average snowfall in September: 0"
The months with the highest snowfall are February and December (2.09").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Saint James, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint James, 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 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in September
Saint James, MO
- Average sunshine days in September: 16 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is July (12.6 days).
Average UV index in September
Saint James, 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 James, MO
- Average cloud cover in September: 33
The months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in September
Saint James, MO
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, October, November and December (6mi).
The months with the lowest visibility are May, July, August and September (5mi).
Saint James, Missouri, USA
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