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
During the shift to September, Saint Louis records a mild decrease in average high-temperature, moving from a hot 92.5°F (33.6°C) in August to a moderately hot 84.4°F (29.1°C). During September, the nighttime temperature in Saint Louis averages to a refreshing 64.9°F (18.3°C).Heat index
The average heat index in September is estimated at a hot 91.4°F (33°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.Take into consideration that the heat index values are calculated for shade and light wind conditions. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Humidity
The average relative humidity in September is 68%.Rainfall
In Saint Louis, in September, during 11.8 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. In Saint Louis, during the entire year, the rain falls for 111.2 days and collects up to 17.13" (435mm) of precipitation.Snowfall
In Saint Louis, snow does not fall in May through October.Daylight
In September, the average length of the day in Saint Louis, Oklahoma, is 12h and 23min.On the first day of September in Saint Louis, sunrise is at 7:00 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:12 pm CDT.
Sunshine
In September, the average sunshine in Saint Louis is 8.5h.UV index
In Saint Louis, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Frequently asked questions
How hot does it get in Saint Louis in September?
What is the average humidity in September in Saint Louis?
How many days does it rain in September in Saint Louis?
When it does not snow in Saint Louis?
What is the average length of the day in September in Saint Louis?
When is the sunrise / sunset in September in Saint Louis?
How long on average sun shines in September in Saint Louis?
How high is the UV index in September in Saint Louis?
Average temperature in September
Saint Louis, OK
- Average high temperature in September: 84.4°F
The warmest month (with the highest average high temperature) is August (92.5°F).
The month with the lowest average high temperature is January (49.3°F).
- Average low temperature in September: 64.9°F
The month with the highest average low temperature is July (72.7°F).
The coldest month (with the lowest average low temperature) is January (33.4°F).
Average pressure in September
Saint Louis, OK
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Saint Louis, OK
- Average wind speed in September: 7.8mph
The windiest months (with the highest average wind speed) are March and April (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7.5mph).
Average humidity in September
Saint Louis, OK
- Average humidity in September: 68%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is August (63%).
Average rainfall in September
Saint Louis, OK
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is February (0.71").
Average rainfall days in September
Saint Louis, OK
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is May (12.4 days).
The month with the least rainy days is January (5.3 days).
Average snowfall in September
Saint Louis, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.75").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Saint Louis, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Saint Louis, OK
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Saint Louis, OK
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is January (24 days).
The months with the least sunshine days are April, May and September (15.9 days).
Average UV index in September
Saint Louis, OK
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Saint Louis, OK
- Average cloud cover in September: 28
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Saint Louis, OK
- 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).
Saint Louis, Oklahoma, USA
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