September weather forecast and climate
Cedar Key, FL

Weather in September

The first month of the autumn, September, is still a tropical month in Cedar Key, Florida, with average temperature varying between 72.9°F (22.7°C) and 87.3°F (30.7°C).

Temperature

In Cedar Key, the average high-temperature in September is almost the same as in August - a still hot 87.3°F (30.7°C). The average low-temperature, in Cedar Key, is 72.9°F (22.7°C).

Heat index

In September, the average heat index is appraised at a very hot 102°F (38.9°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the 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 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, clothing, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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

The most humid month in Cedar Key is September, with an average relative humidity of 77%.

Rainfall

In Cedar Key, during September, the rain falls for 18.7 days and regularly aggregates up to 1.85" (47mm) of precipitation. In Cedar Key, Florida, during the entire year, the rain falls for 154 days and collects up to 21.69" (551mm) of precipitation.

Snowfall

In Cedar Key snow does not fall in January through November.

Ocean temperature

In Cedar Key, the average seawater temperature in September is 83.8°F (28.8°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The average length of the day in Cedar Key, Florida, is 12.3h.

Sunshine

In Cedar Key, Florida, the average sunshine in September is 8.6h.

UV index

In Cedar Key, Florida, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in September in Cedar Key?

The average high-temperature, in September, is 87.3°F (30.7°C), while the average low-temperature is 72.9°F (22.7°C). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), that combines air temperature and relative humidity, is appraised at 102°F (38.9°C).

What is the most humid month in Cedar Key?

September is the most humid month in Cedar Key, with an average relative humidity of 77%.

What is the average humidity in September in Cedar Key?

In Cedar Key, the average relative humidity in September is 77%.

How many days does it rain in September in Cedar Key?

In Cedar Key, Florida, in September, during 18.7 rainfall days, 1.85" (47mm) of precipitation is typically accumulated.

When it does not snow in Cedar Key?

January through November are months without snowfall in Cedar Key, Florida.

What is the water temperature in September in Cedar Key?

In September, the average ocean temperature in Cedar Key, Florida, is 83.8°F (28.8°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in September in Cedar Key?

In Cedar Key, the average length of the day in September is 12.3h.

How many hours of sunshine does Cedar Key have in September?

In Cedar Key, Florida, the average sunshine in September is 8.6h.

How high is the UV index in September in Cedar Key?

In Cedar Key, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Cedar Key, FL

Average temperature in September - Cedar Key, FL
  • Average high temperature in September: 87.3°F

The warmest month (with the highest average high temperature) is August (90.3°F).
The month with the lowest average high temperature is January (64°F).

  • Average low temperature in September: 72.9°F

The month with the highest average low temperature is August (76.5°F).
The coldest month (with the lowest average low temperature) is January (47.7°F).

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Average pressure in September
Cedar Key, FL

Average pressure in September - Cedar Key, FL
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is September (29.97").

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Average wind speed in September
Cedar Key, FL

Average wind speed in September - Cedar Key, FL
  • Average wind speed in September: 5.4mph

The windiest months (with the highest average wind speed) are January, February and March (7.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).

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Average humidity in September
Cedar Key, FL

Average humidity in September - Cedar Key, FL
  • Average humidity in September: 77%

The month with the highest relative humidity is September (77%).
The month with the lowest relative humidity is January (71%).

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Average rainfall in September
Cedar Key, FL

Average rainfall in September - Cedar Key, FL
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is August (3.58").
The driest month (with the least rainfall) is November (0.83").

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Average rainfall days in September
Cedar Key, FL

Average rainfall days in September - Cedar Key, FL
  • Average rainfall days in September: 18.7 days

The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is November (6.6 days).

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Average snowfall days in September
Cedar Key, FL

Average snowfall days in September - Cedar Key, FL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in September
Cedar Key, FL

Average sea temperature in September - Cedar Key, FL
  • Average sea temperature in September: 83.8°F

The best month for swimming (with the highest average sea temperature) is August (86.4°F).
The coldest month (with the lowest average sea temperature) is January (58.4°F).

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Average daylight in September /
Average sunshine in September
Cedar Key, FL

Average daylight in September / Average sunshine in September - Cedar Key, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14h).
The month with the shortest days is December (Average daylight: 10.3h).

  • Average sunshine in September: 8.6h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in September
Cedar Key, FL

Average sunshine days in September - Cedar Key, FL
  • Average sunshine days in September: 8.8 days

The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is July (5.8 days).

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Average UV index in September
Cedar Key, FL

Average UV index in September - Cedar Key, FL
  • Average UV index in September: 6

Months with the highest UV index are May, June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 4).

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Average cloud cover in September
Cedar Key, FL

Average cloud cover in September - Cedar Key, FL
  • Average cloud cover in September: 31

Months with the most cloud cover are February and December (Cloud cover 36).
The month with the least cloud cover is May (Cloud cover 25).

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Average visibility in September
Cedar Key, FL

Average visibility in September - Cedar Key, FL
  • Average visibility in September: 6mi

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

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