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
Fullerton observes a minor difference in average high-temperatures between August's 93.2°F (34°C) and September's 88.2°F (31.2°C). In September, the temperature drops to an average of 68.9°F (20.5°C) at night.Heat index
September's average heat index is estimated at a blisteringly hot 104°F (40°C). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.Note that heat index values are valued for light wind and location in the shade. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'feels like' or 'felt air temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.
Humidity
The average relative humidity in September is 76%.Rainfall
In Fullerton, during September, the rain falls for 17.5 days and regularly aggregates up to 3.15" (80mm) of precipitation. In Fullerton, during the entire year, the rain falls for 181.2 days and collects up to 39.17" (995mm) of precipitation.Snowfall
Months with snowfall in Fullerton are January through March, September and December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Fullerton, during the entire year, snow falls for 1.8 days and aggregates up to 0.94" (24mm) of snow.Daylight
In Fullerton, the average length of the day in September is 12h and 20min.On the first day of September, sunrise is at 6:48 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:57 pm CDT.
Sunshine
In Fullerton, the average sunshine in September is 9.2h.UV index
In Fullerton, Louisiana, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 6 suggests this advice:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What is the average humidity in September in Fullerton?
How many days does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Fullerton have in September?
How high is the UV index in September?
Average temperature in September
Fullerton, LA
- Average high temperature in September: 88.2°F
The warmest month (with the highest average high temperature) is July (93.6°F).
The month with the lowest average high temperature is January (57°F).
- Average low temperature in September: 68.9°F
The month with the highest average low temperature is August (73.2°F).
The coldest month (with the lowest average low temperature) is January (41.2°F).
Average pressure in September
Fullerton, LA
- Average pressure in September: 29.96"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
Fullerton, LA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in September
Fullerton, LA
- Average humidity in September: 76%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Fullerton, LA
- Average rainfall in September: 3.15"
The wettest month (with the highest rainfall) is August (5").
The driest month (with the least rainfall) is November (2.17").
Average rainfall days in September
Fullerton, LA
- Average rainfall days in September: 17.5 days
The month with the highest number of rainy days is August (20.5 days).
The month with the least rainy days is November (10.5 days).
Average snowfall in September
Fullerton, LA
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (0.63").
The months with the least snowfall are April, May, June, July, August, October and November (0").
Average snowfall days in September
Fullerton, LA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (0.6 days).
The months with the least snowfall days are April, May, June, July, August, October and November (0 days).
Average daylight in September /
Average sunshine in September
Fullerton, 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 1min
The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Fullerton, LA
- Average sunshine days in September: 10.8 days
The month with the most sunshine days is October (19 days).
The month with the least sunshine days is August (8.8 days).
Average UV index in September
Fullerton, 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
Fullerton, LA
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is October (Cloud cover 31).
Average visibility in September
Fullerton, LA
- Average visibility in September: 5mi
The months with the highest visibility are October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September and December (5mi).
Fullerton, Louisiana, USA
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