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
September marks a gentle change in average high-temperature, declining from August's tropical 86.7°F (30.4°C) to a warm 80.1°F (26.7°C). Flat River's temperature in September lowers to a consistent average of 59.2°F (15.1°C) during the nights.Humidity
The average relative humidity in September in Flat River, Missouri, is 75%.Rainfall
The month with the least rainfall in Flat River, Missouri, is September, when the rain falls for 13.4 days and typically collects 1.89" (48mm) of precipitation.Snowfall
In Flat River, Missouri, snow does not fall in April through October.Daylight
In September, the average length of the day in Flat River, Missouri, is 12h and 25min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:46 pm CDT.
Sunshine
In Flat River, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Take precautions - Protection against skin and eye damage is obliged. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Flat River?
What is the average humidity in September in Flat River?
What is the driest month in Flat River?
How much does it rain in Flat River in September?
When it does not snow in Flat River?
How many hours of daylight does Flat River have in September?
When are sunrise and sunset in September in Flat River?
How long on average sun shines in September in Flat River?
How high is the UV index in September in Flat River?
Average temperature in September
Flat River, MO
- Average high temperature in September: 80.1°F
The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (39.6°F).
- Average low temperature in September: 59.2°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in September
Flat River, 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 (29.93"Hg).
Average wind speed in September
Flat River, MO
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Flat River, MO
- Average humidity in September: 75%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Flat River, MO
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is May (3.7").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in September
Flat River, MO
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is December (7.7 days).
Average snowfall in September
Flat River, MO
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.72").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Flat River, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (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
Flat River, 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 2min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 42min).
Average sunshine days in September
Flat River, MO
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is October (19.4 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Flat River, 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
Flat River, MO
- Average cloud cover in September: 32
The months with the most cloud cover are January and February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in September
Flat River, 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).
Flat River, Missouri, USA
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