September weather forecast
Boca Raton, FL

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The Atlantic ocean surrounding the fantastic city of Boca Raton, Florida
The Atlantic ocean surrounding the fantastic city of Boca Raton, Florida

Weather in September

In September, Boca Raton begins transitioning towards autumn, but the heat persists with reduced intensity. This transition month experiences a noticeable reduction in daily sunshine hours, indicating shortening days. Despite reduced heat, humidity levels remain on the higher side, while frequent showers contribute to the overall moist conditions. The wind speed observes a minor, yet noticeable, increase compared to August. The sea temperature in Boca Raton is high in September, averaging 85.1°F (29.5°C).

Temperature

Boca Raton experiences an average high-temperature of a warm 85.3°F (29.6°C) in September, marking an insignificant shift from 87.1°F (30.6°C) in August. Boca Raton, in September, registers a nighttime average temperature of 80.2°F (26.8°C).

Heat index

For most parts of September, the heat index is estimated at a torrid 95°F (35°C). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Research indicates the heat index considers values in shaded locales and with light winds. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'feels like', takes into account both air temperature and humidity to illustrate what people actually feel. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In September, the rain falls for 27.8 days. Throughout September, 10.59" (269mm) of precipitation is accumulated. Throughout the year, there are 244.6 rainfall days, and 68.54" (1741mm) of precipitation is accumulated.

Ocean temperature

In September, the average ocean temperature in Boca Raton is 85.1°F (29.5°C).
Note: With water temperature from 77°F (25°C) to 84.2°F (29°C), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.

Daylight

In September, the average length of the day in Boca Raton is 12h and 18min.
On the first day of September in Boca Raton, sunrise is at 7:00 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:07 pm EDT.

Sunshine

In Boca Raton, the average sunshine in September is 9h.

UV index

The months with the highest UV index in Boca Raton are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 7 during September leads to these instructions:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Note! Reflective surfaces like sand and water heighten the UV radiation levels.
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Frequently asked questions

How hot is it in Boca Raton in September?

In September, in Boca Raton, the average high-temperature is 85.3°F (29.6°C), and the average low-temperature is 80.2°F (26.8°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is estimated at 95°F (35°C).

What is the average humidity in September in Boca Raton?

The average relative humidity in September is 74%.

How many days does it rain in September in Boca Raton?

In Boca Raton, in September, it is raining for 27.8 days, with typically 10.59" (269mm) of accumulated precipitation.

How warm is the water in September in Boca Raton?

In September, the average ocean temperature in Boca Raton, Florida, is 85.1°F (29.5°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.

How many hours of daylight does Boca Raton have in September?

In Boca Raton, the average day length in September is 12h and 18min.

What time are sunrise and sunset in September in Boca Raton?

In September, on the first day of the month, sunrise is at 7:00 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:07 pm EDT.

How long on average sun shines in September in Boca Raton?

In Boca Raton, the average sunshine duration in September is 9h.

When is the highest UV index in Boca Raton?

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

What is the UV index intensity in September in Boca Raton?

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

Average temperature in September
Boca Raton, FL

Average temperature in September - Boca Raton, 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 (72.5°F).

  • Average low temperature in September: 80.2°F

The month with the highest average low temperature is August (81.5°F).
The coldest month (with the lowest average low temperature) is January (64.2°F).

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Average pressure in September
Boca Raton, FL

Average pressure in September - Boca Raton, FL
  • Average pressure in September: 29.95"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is September (29.95"Hg).

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Average wind speed in September
Boca Raton, FL

Average wind speed in September - Boca Raton, FL
  • Average wind speed in September: 8.4mph

The windiest month (with the highest average wind speed) is March (11.4mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).

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Average humidity in September
Boca Raton, FL

Average humidity in September - Boca Raton, FL
  • Average humidity in September: 74%

The months with the highest relative humidity are June and December (75%).
The month with the lowest relative humidity is March (70%).

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Average rainfall in September
Boca Raton, FL

Average rainfall in September - Boca Raton, FL
  • Average rainfall in September: 10.59"

The wettest month (with the highest rainfall) is August (12.05").
The driest month (with the least rainfall) is January (1.57").

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Average rainfall days in September
Boca Raton, FL

Average rainfall days in September - Boca Raton, FL
  • Average rainfall days in September: 27.8 days

The month with the highest number of rainy days is August (29.3 days).
The month with the least rainy days is February (12.7 days).

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Average sea temperature in September
Boca Raton, FL

Average sea temperature in September - Boca Raton, FL
  • Average sea temperature in September: 85.1°F

The best month for swimming (with the highest average sea temperature) is August (86.3°F).
The coldest months (with the lowest average sea temperature) are January and February (74.2°F).

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Average daylight in September /
Average sunshine in September
Boca Raton, FL

Average daylight in September / Average sunshine in September - Boca Raton, 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 month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 6h and 12min).

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Average sunshine days in September
Boca Raton, FL

Average sunshine days in September - Boca Raton, FL
  • Average sunshine days in September: 1.4 days

The month with the most sunshine days is March (13.3 days).
The month with the least sunshine days is August (0.9 days).

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Average UV index in September
Boca Raton, FL

Average UV index in September - Boca Raton, 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 month with the lowest UV index is January (UV index 5).

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Average cloud cover in September
Boca Raton, FL

Average cloud cover in September - Boca Raton, FL
  • Average cloud cover in September: 31

The month with the most cloud cover is October (Cloud cover 36).
The months with the least cloud cover are March, April, May and July (Cloud cover 29).

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Average visibility in September
Boca Raton, FL

Average visibility in September - Boca Raton, 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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Boca Raton, Florida, USA

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