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
Lisbon's weather subtly changes with the onset of September, barely falling from a tropical 93.7°F (34.3°C) in August to a still hot 88°F (31.1°C). Nighttime temperature dips to a mean of 66.9°F (19.4°C) during September.Heat index
During September, the heat index is calculated to be a very hot 100.4°F (38°C). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.Evaluating the heat index requires understanding its values in the shade and with gentle winds. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', unifies temperature and humidity readings to offer a comprehensive feel of warmth. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.
Humidity
In Lisbon, the average relative humidity in September is 71%.Rainfall
September is the month with the least rainfall. Rain falls for 13.1 days and accumulates 2.2" (56mm) of precipitation.Snowfall
April through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 6:46 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:56 pm CDT.
Sunshine
The average sunshine in September is 9.6h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.Note: The UV index of 6 during September translates into the following guidance:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September in Lisbon?
How high is the UV index in September?
Average temperature in September
Lisbon, LA
- Average high temperature in September: 88°F
The warmest month (with the highest average high temperature) is July (93.9°F).
The month with the lowest average high temperature is January (53.4°F).
- Average low temperature in September: 66.9°F
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (37.9°F).
Average pressure in September
Lisbon, LA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Lisbon, LA
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Lisbon, LA
- Average humidity in September: 71%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are July and August (70%).
Average rainfall in September
Lisbon, LA
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is April (4.25").
The driest month (with the least rainfall) is September (2.2").
Average rainfall days in September
Lisbon, LA
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is March (15.6 days).
The month with the least rainy days is October (10.1 days).
Average snowfall in September
Lisbon, LA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.55").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Lisbon, LA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Lisbon, LA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Lisbon, LA
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is October (19.6 days).
The month with the least sunshine days is March (13.3 days).
Average UV index in September
Lisbon, LA
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Lisbon, LA
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).
Average visibility in September
Lisbon, LA
- Average visibility in September: 6mi
The months with the highest visibility are April, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, May and December (5mi).
Lisbon, Louisiana, USA
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