September weather forecast
Bay Harbor Islands, FL

Weather in September

September, the first month of the autumn, in Bay Harbor Islands, is also a hot month, with average temperature varying between 81°F (27.2°C) and 86.2°F (30.1°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still tropical 86.2°F (30.1°C). The average low-temperature, in Bay Harbor Islands, is 81°F (27.2°C).

Heat index

The average heat index is calculated to be a very hot 96.8°F (36°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', 'felt air temperature', 'apparent temperature', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, clothing, metabolic differences, and wind affect individual temperature impact. 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 especially crucial for babies and toddlers. 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 cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. 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 exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In September, the average relative humidity in Bay Harbor Islands, Florida, is 73%.

Rainfall

In Bay Harbor Islands, it is raining for 21.7 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, there are 157 rainfall days, and 11.34" (288mm) of precipitation is accumulated.

Snowfall

September is the only month when snow falls in Bay Harbor Islands. The month with the most snowfall in Bay Harbor Islands is September when snow falls for 0.1 days and typically aggregates up to 0.04" (1mm) of snow.

Ocean temperature

In September, the average ocean temperature is 85.5°F (29.7°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 Bay Harbor Islands, the average length of the day in September is 12.3h.

Sunshine

In September, the average sunshine in Bay Harbor Islands 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 reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
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. 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 strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Bay Harbor Islands?

The average high-temperature, in September, in Bay Harbor Islands, is 86.2°F (30.1°C), while the average low-temperature is 81°F (27.2°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 96.8°F (36°C).

What is the average humidity in September in Bay Harbor Islands?

In September, the average relative humidity in Bay Harbor Islands is 73%.

How many days does it rain in September in Bay Harbor Islands?

In September, the rain falls for 21.7 days. Throughout September, 1.1" (28mm) of precipitation is accumulated.

When does it snow the most in Bay Harbor Islands?

September is the month with the most snowfall in Bay Harbor Islands, Florida. Snow falls for 0.1 days and accumulates 0.04" (1mm) of snow.

When does it start to snow in Bay Harbor Islands?

September is the first month it typically snows in Bay Harbor Islands. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

How warm is the water in September in Bay Harbor Islands?

In Bay Harbor Islands, Florida, the average seawater temperature in September is 85.5°F (29.7°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 Bay Harbor Islands have in September?

The average length of the day in September is 12.3h.

How many hours of sunshine does Bay Harbor Islands have in September?

In September, the average sunshine is 9h.

What are the months with the highest UV index in Bay Harbor Islands?

Months with the highest UV index in Bay Harbor Islands are May through September, with an average maximum UV index of 7.

What is the UV index reading in September in Bay Harbor Islands?

In September, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Bay Harbor Islands, FL

Average temperature in September - Bay Harbor Islands, FL
  • Average high temperature in September: 86.2°F

The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is January (73°F).

  • Average low temperature in September: 81°F

The month with the highest average low temperature is August (82°F).
The coldest month (with the lowest average low temperature) is January (64°F).

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Average pressure in September
Bay Harbor Islands, FL

Average pressure in September - Bay Harbor Islands, FL
  • Average pressure in September: 29.95"

The month with the highest atmospheric pressure is January (30.11").
Months with the lowest atmospheric pressure are September and October (29.95").

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Average wind speed in September
Bay Harbor Islands, FL

Average wind speed in September - Bay Harbor Islands, FL
  • Average wind speed in September: 8.1mph

The windiest month (with the highest average wind speed) is March (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

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Average humidity in September
Bay Harbor Islands, FL

Average humidity in September - Bay Harbor Islands, FL
  • Average humidity in September: 73%

The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is March (69%).

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Average rainfall in September
Bay Harbor Islands, FL

Average rainfall in September - Bay Harbor Islands, FL
  • Average rainfall in September: 1.1"

The wettest month (with the highest rainfall) is August (1.97").
The driest month (with the least rainfall) is January (0.31").

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Average rainfall days in September
Bay Harbor Islands, FL

Average rainfall days in September - Bay Harbor Islands, FL
  • Average rainfall days in September: 21.7 days

The month with the highest number of rainy days is September (21.7 days).
The month with the least rainy days is February (6.8 days).

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Average snowfall in September
Bay Harbor Islands, FL

Average snowfall in September - Bay Harbor Islands, FL
  • Average snowfall in September: 0.04"

The month with the highest snowfall is September (0.04").
Months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0").

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Average snowfall days in September
Bay Harbor Islands, FL

Average snowfall days in September - Bay Harbor Islands, FL
  • Average snowfall days in September: 0.1 days

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

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Average sea temperature in September
Bay Harbor Islands, FL

Average sea temperature in September - Bay Harbor Islands, FL
  • Average sea temperature in September: 85.4°F

The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is February (74°F).

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Average daylight in September /
Average sunshine in September
Bay Harbor Islands, FL

Average daylight in September / Average sunshine in September - Bay Harbor Islands, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.7h).
The month with the shortest days is December (Average daylight: 10.5h).

  • Average sunshine in September: 9h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 6.3h).

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Average sunshine days in September
Bay Harbor Islands, FL

Average sunshine days in September - Bay Harbor Islands, FL
  • Average sunshine days in September: 4.4 days

The month with the most sunshine days is March (20.3 days).
The month with the least sunshine days is September (4.4 days).

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Average UV index in September
Bay Harbor Islands, FL

Average UV index in September - Bay Harbor Islands, FL
  • Average UV index in September: 7

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
Bay Harbor Islands, FL

Average cloud cover in September - Bay Harbor Islands, FL
  • Average cloud cover in September: 30

The month with the most cloud cover is October (Cloud cover 35).
The month with the least cloud cover is April (Cloud cover 27).

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Average visibility in September
Bay Harbor Islands, FL

Average visibility in September - Bay Harbor Islands, 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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