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
Florissant's progression into September involves a gentle drop in the average high-temperature, from a moderately hot 85.3°F (29.6°C) in August to a still warm 79.5°F (26.4°C). Florissant registers a consistent average low-temperature of 59.9°F (15.5°C) during September.Humidity
The average relative humidity in September is 73%.Rainfall
In Florissant, in September, it is raining for 12.4 days, with typically 2.01" (51mm) of accumulated precipitation. Throughout the year, there are 149 rainfall days, and 31.61" (803mm) of precipitation is accumulated.Snowfall
In Florissant, Missouri, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:31 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:45 pm CDT.
Sunshine
The average sunshine in September is 9.5h.UV index
In Florissant, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. When the Sun is at its strongest around midday, find shade and limit exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Florissant in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Florissant have in September?
What is the UV index reading in September?
Average temperature in September
Florissant, MO
- Average high temperature in September: 79.5°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (37.2°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (24.1°F).
Average pressure in September
Florissant, 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
Florissant, MO
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).
Average humidity in September
Florissant, MO
- Average humidity in September: 73%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Florissant, MO
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is February (1.69").
Average rainfall days in September
Florissant, MO
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in September
Florissant, MO
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.95").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Florissant, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.7 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
Florissant, 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 3min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Florissant, MO
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is October (19 days).
The month with the least sunshine days is May (11 days).
Average UV index in September
Florissant, 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, November and December (UV index 2).
Average cloud cover in September
Florissant, MO
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Florissant, 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).
Florissant, Missouri, USA
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