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 shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a tropical 94.1°F (34.5°C) to a still hot 88.3°F (31.3°C). During September, Chatham's temperature averages to an enjoyable 67.3°F (19.6°C) at night.Heat index
For most parts of September, the heat index is evaluated at a sweltering 102.2°F (39°C). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.Take into consideration that the heat index values are calculated for shade and light wind conditions. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.
Humidity
In September, the average relative humidity in Chatham is 72%.Rainfall
The month with the least rainfall is September, when the rain falls for 12.8 days and typically collects 1.93" (49mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
The average length of the day in September is 12h and 21min.On the first day of September, sunrise is at 6:45 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:55 pm CDT.
Sunshine
In Chatham, the average sunshine in September is 9.5h.UV index
In Chatham, 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 ordinary individuals.Note: In September, the maximum UV index of 6 suggests this advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September in Chatham?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Chatham, LA
- Average high temperature in September: 88.3°F
The warmest month (with the highest average high temperature) is July (94.3°F).
The month with the lowest average high temperature is January (54.1°F).
- Average low temperature in September: 67.3°F
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (38.7°F).
Average pressure in September
Chatham, 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
Chatham, LA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).
Average humidity in September
Chatham, LA
- Average humidity in September: 72%
The months with the highest relative humidity are February and December (82%).
The months with the lowest relative humidity are August and October (71%).
Average rainfall in September
Chatham, LA
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is April (3.78").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in September
Chatham, LA
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in September
Chatham, LA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.16").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Chatham, LA
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.6 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
Chatham, LA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Chatham, LA
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in September
Chatham, LA
- Average UV index in September: 6
The months with the highest UV index are May, 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
Chatham, LA
- Average cloud cover in September: 30
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in September
Chatham, LA
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April, May and December (5mi).
Chatham, Louisiana, USA
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