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, Princeton records a mild decrease in average high-temperature, moving from a very hot 95.4°F (35.2°C) in August to a hot 88.9°F (31.6°C). During the month of September, the temperature generally drops to a low average of 68°F (20°C).Heat index
The heat index value during September is computed to be a sweltering 102.2°F (39°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', evaluates the perceived heat by adding the effect of moisture in the air. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.
Humidity
In September, the average relative humidity is 69%.Rainfall
In Princeton, in September, it is raining for 11.7 days, with typically 1.97" (50mm) of accumulated precipitation. Throughout the year, there are 149.4 rainfall days, and 36.34" (923mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 22min.On the first day of September, sunrise is at 6:49 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:59 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 estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Princeton in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow in Princeton?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Princeton, LA
- Average high temperature in September: 88.9°F
The warmest month (with the highest average high temperature) is August (95.4°F).
The month with the lowest average high temperature is January (54°F).
- Average low temperature in September: 68°F
The month with the highest average low temperature is July (73.9°F).
The coldest month (with the lowest average low temperature) is January (38.3°F).
Average pressure in September
Princeton, LA
- 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 (29.93"Hg).
Average wind speed in September
Princeton, LA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest months (with the lowest average wind speed) are August and September (5.2mph).
Average humidity in September
Princeton, LA
- Average humidity in September: 69%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is August (66%).
Average rainfall in September
Princeton, LA
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is April (4.25").
The driest month (with the least rainfall) is July (1.85").
Average rainfall days in September
Princeton, LA
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is March (14.7 days).
The month with the least rainy days is October (9.5 days).
Average snowfall in September
Princeton, 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 and October (0").
Average snowfall days in September
Princeton, LA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (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
Princeton, 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 6min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 5h and 0min).
Average sunshine days in September
Princeton, LA
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is February (12.9 days).
Average UV index in September
Princeton, 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
Princeton, LA
- Average cloud cover in September: 29
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Princeton, LA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Princeton, Louisiana, USA
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