September weather forecast
Merlin, LA

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Weather in September

September, the first month of the autumn in Merlin, is also a hot month, with temperature in the range of an average low of 70.3°F (21.3°C) and an average high of 87.3°F (30.7°C).

Temperature

September's advent notes a subtle adjustment in average high-temperature to a still tropical 87.3°F (30.7°C) from August. In September, the nighttime temperature lowers to an average of 70.3°F (21.3°C).

Heat index

In September, the heat index is appraised at an extremely hot 104°F (40°C). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

In Merlin, the average relative humidity in September is 79%.

Rainfall

In Merlin, during September, the rain falls for 16 days and regularly aggregates up to 1.18" (30mm) of precipitation. Throughout the year, there are 148.6 rainfall days, and 15.51" (394mm) of precipitation is accumulated.

Snowfall

February through December are months without snowfall.

Daylight

The average length of the day in September in Merlin is 12h and 20min.
On the first day of the month, sunrise is at 6:42 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:51 pm CDT.

Sunshine

In September, the average sunshine is 9.7h.

UV index

In Merlin, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 6 in September translates into this advice:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Updated: Aug 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in September?

The average high-temperature, in September, in Merlin, is 87.3°F (30.7°C), while the average low-temperature is 70.3°F (21.3°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is appraised at 104°F (40°C).

What is the average humidity in September?

The average relative humidity in September is 79%.

How many days does it rain in September?

In Merlin, in September, it is raining for 16 days, with typically 1.18" (30mm) of accumulated precipitation.

When it does not snow?

February through December are months without snowfall.

What is the average length of the day in September?

The average day length in September in Merlin is 12h and 20min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:42 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:51 pm CDT.

How many hours of sunshine does Merlin have in September?

The average sunshine duration in September is 9.7h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Merlin, LA

Average temperature in September - Merlin, LA
  • Average high temperature in September: 87.3°F

The warmest months (with the highest average high temperature) are July and August (91.2°F).
The month with the lowest average high temperature is January (59°F).

  • Average low temperature in September: 70.3°F

The month with the highest average low temperature is August (74.5°F).
The coldest month (with the lowest average low temperature) is January (43.5°F).

Average pressure in September
Merlin, LA

Average pressure in September - Merlin, LA
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.96"Hg).

Average wind speed in September
Merlin, LA

Average wind speed in September - Merlin, LA
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is February (6.9mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).

Average humidity in September
Merlin, LA

Average humidity in September - Merlin, 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 (73%).

Average rainfall in September
Merlin, LA

Average rainfall in September - Merlin, LA
  • Average rainfall in September: 1.18"

The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is March (0.67").

Average rainfall days in September
Merlin, LA

Average rainfall days in September - Merlin, LA
  • Average rainfall days in September: 16 days

The month with the highest number of rainy days is August (20.9 days).
The month with the least rainy days is November (7.1 days).

Average snowfall in September
Merlin, LA

Average snowfall in September - Merlin, LA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.08").
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
Merlin, LA

Average snowfall days in September - Merlin, LA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.3 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
Merlin, LA

Average daylight in September / Average sunshine in September - Merlin, 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 4min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

Average sunshine days in September
Merlin, LA

Average sunshine days in September - Merlin, LA
  • Average sunshine days in September: 11.3 days

The month with the most sunshine days is November (21.4 days).
The months with the least sunshine days are July and August (7.3 days).

Average UV index in September
Merlin, LA

Average UV index in September - Merlin, LA
  • Average UV index in September: 6

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in September
Merlin, LA

Average cloud cover in September - Merlin, LA
  • Average cloud cover in September: 31

The months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is October (Cloud cover 27).

Average visibility in September
Merlin, LA

Average visibility in September - Merlin, LA
  • Average visibility in September: 5mi

The months with the highest visibility are January, February, June, October, November and December (6mi).
The months with the lowest visibility are March, April, May, July, August and September (5mi).

Merlin, Louisiana, USA

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