September weather forecast and climate
Stuart, FL

Weather in September

September, the first month of the autumn, in Stuart, is also a moderately hot month, with 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). The average low-temperature, in September, is 78.3°F (25.7°C).

Heat index

In September, the average heat index is appraised at a sweltering 96.3°F (35.7°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like metabolic differences, pregnancy, wind, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. 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

The average relative humidity in Stuart is 77%.

Rainfall

In Stuart, during September, the rain falls for 22.6 days and regularly aggregates up to 1.5" (38mm) of 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 September, the average ocean temperature in Stuart, Florida, is 84.4°F (29.1°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

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

Sunshine

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

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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). In September, the average heat index (a.k.a. 'feels like', 'real feel'), that combines air temperature and relative humidity, is appraised 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, Florida, in September, it is raining for 22.6 days, with typically 1.5" (38mm) of accumulated precipitation.

How warm is the water in September in Stuart?

In September, the average ocean temperature in Stuart, Florida, 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 length of the day in September in Stuart, Florida, is 12.3h.

How many hours of sunshine does Stuart have in September?

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

What are the months with the highest UV index in Stuart?

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

How high is the UV index in September in Stuart?

The average daily maximum UV index in September in Stuart is 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to the 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"

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

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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%

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: 12.3h

The month with the longest days is June (Average daylight: 13.8h).
The month with the shortest days is December (Average daylight: 10.4h).

  • Average sunshine in September: 9h

Months with the most sunshine are July and August (Average sunshine: 10.9h).
Months with the least sunshine are January and December (Average sunshine: 6.1).

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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

Months with the highest UV index are May, June, July, August and September (UV index 7).
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

Months with the most cloud cover are January, November and December (Cloud cover 34).
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

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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