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's onset sees an average high-temperature of a still hot 87.4°F (30.8°C), exhibiting a slight fluctuation from the previous month. Throughout September, Brittany's nights cool down to an average of 70.5°F (21.4°C).Heat index
During September, the heat index is computed to be a blistering 104°F (40°C). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.Observations indicate that the heat index values are for shady locations with light wind. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'real feel', marries air temperature and humidity to produce a value illustrating perceived warmth. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. As body temperatures escalate without effective heat release, one might face dehydration threats.
Humidity
The average relative humidity in September is 79%.Rainfall
In Brittany, in September, it is raining for 14.9 days, with typically 1.18" (30mm) of accumulated precipitation. Throughout the year, there are 151.5 rainfall days, and 18.62" (473mm) of precipitation is accumulated.Snowfall
In Brittany, snow does not fall in February through December.Daylight
In September, the average length of the day is 12h and 20min.On the first day of the month, sunrise is at 6:40 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:49 pm CDT.
Sunshine
In September, the average sunshine is 9.9h.UV index
In Brittany, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum high UV index of 6 in September translates into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in Brittany?
What is the average humidity in September in Brittany?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September in Brittany?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Brittany, LA
- Average high temperature in September: 87.4°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (59.2°F).
- Average low temperature in September: 70.5°F
The month with the highest average low temperature is August (74.8°F).
The coldest month (with the lowest average low temperature) is January (43.5°F).
Average pressure in September
Brittany, LA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Brittany, LA
- Average wind speed in September: 4.9mph
The windiest months (with the highest average wind speed) are February and April (7.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in September
Brittany, LA
- Average humidity in September: 79%
The months with the highest relative humidity are February and December (81%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Brittany, LA
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is July (3.03").
The driest months (with the least rainfall) are March and November (0.98").
Average rainfall days in September
Brittany, LA
- Average rainfall days in September: 14.9 days
The month with the highest number of rainy days is July (18.9 days).
The month with the least rainy days is November (7.9 days).
Average snowfall in September
Brittany, LA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Brittany, LA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Brittany, LA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in September
Brittany, LA
- Average sunshine days in September: 12.9 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is August (9.3 days).
Average UV index in September
Brittany, LA
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Brittany, LA
- Average cloud cover in September: 29
The month with the most cloud cover is December (Cloud cover 47).
The month with the least cloud cover is October (Cloud cover 26).
Average visibility in September
Brittany, LA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, June, July, August, October, November and December (6mi).
The months with the lowest visibility are March, April, May and September (5mi).
Brittany, Louisiana, USA
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