September weather forecast
Roy, FL

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Weather in September

The first month of the autumn, September, is still a tropical month in Roy, Florida, with temperature in the range of an average low of 73°F (22.8°C) and an average high of 88.5°F (31.4°C).

Temperature

September records an average high-temperature of a still hot 88.5°F (31.4°C), indicating a minor variation from the preceding month. September brings with it a nighttime average temperature of 73°F (22.8°C) in Roy.

Heat index

In September, the average heat index is estimated at a blistering 105.8°F (41°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

August, September and December, with an average relative humidity of 77%, are the most humid months.

Rainfall

In Roy, in September, it is raining for 15.2 days, with typically 1.18" (30mm) of accumulated precipitation. Throughout the year, there are 138.3 rainfall days, and 12.76" (324mm) of precipitation is accumulated.

Snowfall

In Roy, snow does not fall in February through December.

Daylight

The average length of the day in September is 12h and 20min.
On the first day of September, sunrise is at 7:03 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:12 pm EDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index in Roy is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 6 transforms into these recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.

Frequently asked questions

Is it hot during September?

September temperatures vary between a high-temperature of 88.5°F (31.4°C) and a low-temperature of 73°F (22.8°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in September is estimated at 105.8°F (41°C).

What is the most humid month?

August, September and December, with an average relative humidity of 77%, are most humid months.

What is the average humidity in September?

The average relative humidity in September is 77%.

How many days does it rain in September?

In Roy, during September, the rain falls for 15.2 days and regularly aggregates up to 1.18" (30mm) of precipitation.

When it does not snow?

In Roy, snow does not fall in February through December.

How many hours of daylight does Roy have in September?

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

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 7:03 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:12 pm EDT.

How many hours of sunshine does Roy have in September?

In September, the average sunshine duration is 8.5h.

How high is the UV index in September?

In Roy, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Roy, FL

Average temperature in September - Roy, FL
  • Average high temperature in September: 88.5°F

The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is January (65.8°F).

  • Average low temperature in September: 73°F

The month with the highest average low temperature is August (75.4°F).
The coldest month (with the lowest average low temperature) is January (48.2°F).

Average pressure in September
Roy, FL

Average pressure in September - Roy, FL
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).

Average wind speed in September
Roy, FL

Average wind speed in September - Roy, FL
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.2mph).

Average humidity in September
Roy, FL

Average humidity in September - Roy, FL
  • Average humidity in September: 77%

The months with the highest relative humidity are August, September and December (77%).
The month with the lowest relative humidity is March (70%).

Average rainfall in September
Roy, FL

Average rainfall in September - Roy, FL
  • Average rainfall in September: 1.18"

The wettest month (with the highest rainfall) is July (2.09").
The driest month (with the least rainfall) is March (0.47").

Average rainfall days in September
Roy, FL

Average rainfall days in September - Roy, FL
  • Average rainfall days in September: 15.2 days

The month with the highest number of rainy days is August (18.8 days).
The month with the least rainy days is November (6.7 days).

Average snowfall days in September
Roy, FL

Average snowfall days in September - Roy, FL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.1 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
Roy, FL

Average daylight in September / Average sunshine in September - Roy, FL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

Average sunshine days in September
Roy, FL

Average sunshine days in September - Roy, FL
  • Average sunshine days in September: 12.1 days

The month with the most sunshine days is January (21.3 days).
The month with the least sunshine days is June (9.3 days).

Average UV index in September
Roy, FL

Average UV index in September - Roy, FL
  • 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 4).

Average cloud cover in September
Roy, FL

Average cloud cover in September - Roy, FL
  • Average cloud cover in September: 33

The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are May and July (Cloud cover 30).

Average visibility in September
Roy, FL

Average visibility in September - Roy, FL
  • Average visibility in September: 6mi

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

Roy, Florida, USA

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