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
The start of September signals a gentle decrease in the average high-temperature, transitioning from a moderately hot 79.9°F (26.6°C) in August to a still warm 74.3°F (23.5°C). Throughout September, a steady low-temperature average of 54.9°F (12.7°C) is noted.Humidity
In September, the average relative humidity is 79%.Rainfall
The month with the least rainfall is September, when the rain falls for 12.2 days and typically collects 1.22" (31mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:58 am and sunset at 8:00 pm. On the last day of September, sunrise is at 7:25 am and sunset at 7:13 pm EDT.
Sunshine
The average sunshine in September is 8.2h.UV index
In Saint Louisville, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 suggests these recommendations:
Take precautions - Protection against skin and eye damage is obliged. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Saint Louisville in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in Saint Louisville in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Saint Louisville have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Saint Louisville have in September?
What is the UV index intensity in September?
Average temperature in September
Saint Louisville, OH
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (32.4°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in September
Saint Louisville, OH
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Saint Louisville, OH
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Saint Louisville, OH
- Average humidity in September: 79%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is November (77%).
Average rainfall in September
Saint Louisville, OH
- Average rainfall in September: 1.22"
The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is September (1.22").
Average rainfall days in September
Saint Louisville, OH
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is May (17.3 days).
The months with the least rainy days are January and February (8.3 days).
Average snowfall in September
Saint Louisville, OH
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.93").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Saint Louisville, OH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.6 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 Louisville, OH
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
Saint Louisville, OH
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in September
Saint Louisville, OH
- Average UV index in September: 4
The months with the highest UV index are 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
Saint Louisville, OH
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Saint Louisville, OH
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Saint Louisville, Ohio, USA
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