September weather forecast
Stuart, FL

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Weather in September

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

Temperature

During September, Stuart observes a subtle ascent to a warm 85.3°F (29.6°C) from August's 87.1°F (30.6°C) in the average high-temperature. Stuart, in September, logs an average low-temperature of 78.3°F (25.7°C), a subtle step down from daytime readings.

Heat index

The average heat index in September is computed to be a torrid 96.8°F (36°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

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

Rainfall

In Stuart, Florida, in September, it is raining for 22.6 days, with typically 1.5" (38mm) of accumulated precipitation. Throughout the year, in Stuart, there are 168.1 rainfall days, and 14.09" (358mm) of precipitation is accumulated.

Ocean temperature

In Stuart, the average seawater temperature in September is 84.4°F (29.1°C).
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.

Daylight

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, sunrise is at 7:13 am and sunset at 7:08 pm EDT.

Sunshine

In September, the average sunshine is 9h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. 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. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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Frequently asked questions

How hot is it in Stuart in September?

In Stuart, in September, 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. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in September is computed to be 96.8°F (36°C).

What is the average humidity in September in Stuart?

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

How much does it rain in Stuart in September?

In Stuart, in September, during 22.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.

What is the ocean temperature in September in Stuart?

In Stuart, Florida, in September, the average water temperature is 84.4°F (29.1°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in September in Stuart?

In September, the average day length in Stuart, Florida, is 12h and 19min.

When are sunrise and sunset in September in Stuart?

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

How many hours of sunshine does Stuart have in September?

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

What is the month with the highest UV index in Stuart?

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

How high is the UV index in September in Stuart?

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

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 2min

The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • 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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Stuart, Florida, USA

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