September weather forecast
Stuart, FL

Weather in September

The first month of the autumn, September, is still a warm month in Stuart, Florida, with an average temperature varying between 85.3°F (29.6°C) and 78.3°F (25.7°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a warm 85.3°F (29.6°C). In September, the average low-temperature is 78.3°F (25.7°C).

Heat index

The average heat index in September is estimated at a sweltering 96.3°F (35.7°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. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, pregnancy, clothing). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

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

Rainfall

In Stuart, it is raining for 22.6 days, with typically 1.5" (38mm) of accumulated precipitation. In Stuart, during the entire year, the rain falls for 168.1 days and collects up to 14.09" (358mm) of precipitation.

Ocean temperature

In Stuart, the average water temperature is 84.4°F (29.1°C).
Note: 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.

Daylight

In Stuart, the average length of the day in September is 12h and 19min.
On the first day of the month, sunrise is at 7:00 am and sunset at 7:41 pm. On the last day of September, in Stuart, sunrise is at 7:13 am and sunset at 7:08 pm EDT.

Sunshine

In Stuart, Florida, the average sunshine in September is 9h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Stuart. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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 reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in Stuart?

In September, in Stuart, the average high-temperature is 85.3°F (29.6°C), and the average low-temperature is 78.3°F (25.7°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, in September is estimated at 96.3°F (35.7°C).

What is the average humidity in September in Stuart?

The average relative humidity in September in Stuart, Florida, is 77%.

How many days does it rain in September in Stuart?

In Stuart, in September, it is raining for 22.6 days, with typically 1.5" (38mm) of accumulated precipitation.

What is the ocean temperature in September in Stuart?

In Stuart, Florida, the average seawater temperature in September is 84.4°F (29.1°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 Stuart?

The average day length in September in Stuart is 12h and 19min.

What time are sunrise and sunset in September in Stuart?

On the first day of September, sunrise is at 7:00 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:08 pm EDT.

How long on average sun shines in September in Stuart?

In Stuart, Florida, the average sunshine duration in September is 9h.

When is the highest UV index in Stuart?

May through September, with an average maximum UV index of 7, are months with the highest UV index.

How high is the UV index in September in Stuart?

The average daily maximum UV index in September in Stuart, Florida, is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.

Average temperature in September
Stuart, FL

Average temperature in September - Stuart, FL
  • Average high temperature in September: 85.3°F

The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is January (71.4°F).

  • Average low temperature in September: 78.3°F

The month with the highest average low temperature is August (79.3°F).
The coldest month (with the lowest average low temperature) is January (61.2°F).

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Average pressure in September
Stuart, FL

Average pressure in September - Stuart, FL
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).

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Average wind speed in September
Stuart, FL

Average wind speed in September - Stuart, FL
  • Average wind speed in September: 7.9mph

The windiest months (with the highest average wind speed) are January, March and November (10.3mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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Average humidity in September
Stuart, FL

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

The months with the highest relative humidity are June and August (78%).
The month with the lowest relative humidity is March (70%).

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Average rainfall in September
Stuart, FL

Average rainfall in September - Stuart, FL
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is August (2.56").
The driest month (with the least rainfall) is January (0.39").

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Average rainfall days in September
Stuart, FL

Average rainfall days in September - Stuart, FL
  • Average rainfall days in September: 22.6 days

The month with the highest number of rainy days is August (23.1 days).
The month with the least rainy days is February (7.7 days).

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Average sea temperature in September
Stuart, FL

Average sea temperature in September - Stuart, FL
  • Average sea temperature in September: 84.4°F

The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (73.3°F).

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Average daylight in September /
Average sunshine in September
Stuart, FL

Average daylight in September / Average sunshine in September - Stuart, FL
  • Average daylight in September: 12h and 19min

The month with the longest days is June (Average daylight: 13h and 50min).
The month with the shortest days is December (Average daylight: 10h and 28min).

  • Average sunshine in September: 9h and 0min

The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 6h and 6min).

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Average sunshine days in September
Stuart, FL

Average sunshine days in September - Stuart, FL
  • Average sunshine days in September: 4.7 days

The month with the most sunshine days is January (19.5 days).
The month with the least sunshine days is August (3.4 days).

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Average UV index in September
Stuart, FL

Average UV index in September - Stuart, FL
  • Average UV index in September: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 5).

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Average cloud cover in September
Stuart, FL

Average cloud cover in September - Stuart, FL
  • Average cloud cover in September: 29

The months with the most cloud cover are January, November and December (Cloud cover 34).
The months with the least cloud cover are May and July (Cloud cover 26).

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Average visibility in September
Stuart, FL

Average visibility in September - Stuart, 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).

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