September weather forecast
Miami, FL

The stunning layout of the Miami Coast in Florida, USA
The stunning layout of the Miami Coast in Florida, USA

Weather in September

The first month of the autumn, September, is still a warm month in Miami, Florida, with an average temperature fluctuating between 81°F (27.2°C) and 85.6°F (29.8°C).

Temperature

In Miami, the average high-temperature in September is relatively the same as in August - a warm 85.6°F (29.8°C). In Miami, the average low-temperature is 81°F (27.2°C).

Heat index

The average heat index in September is calculated to be a sweltering 95.5°F (35.3°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
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', 'felt air temperature', 'apparent temperature', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, differences in body mass, height, and shape, wind, and pregnancy 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 normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Miami, the average relative humidity in September is 73%.

Rainfall

In Miami, during September, the rain falls for 24.5 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, in Miami, there are 182.7 rainfall days, and 16.38" (416mm) of precipitation is accumulated.

Ocean temperature

In Miami, Florida, the average water 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 September, the average length of the day in Miami, Florida, is 12h and 17min.
On the first day of the month, sunrise is at 7:01 am and sunset at 7:40 pm. On the last day of September, in Miami, sunrise is at 7:12 am and sunset at 7:08 pm EDT.

Sunshine

In September, the average sunshine in Miami, Florida, is 9.1h.

UV index

The months with the highest UV index in Miami are May through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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 Miami?

The average high-temperature, in September, is 85.6°F (29.8°C), while the average low-temperature is 81°F (27.2°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is calculated to be 95.5°F (35.3°C).

What is the average humidity in September in Miami?

In September, the average relative humidity in Miami is 73%.

How much does it rain in Miami in September?

In Miami, Florida, during September, the rain falls for 24.5 days and regularly aggregates up to 1.93" (49mm) of precipitation.

What is the water temperature in September in Miami?

In September, the average ocean temperature is 85.5°F (29.7°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.

How many hours of daylight does Miami have in September?

In Miami, Florida, the average day length in September is 12h and 17min.

What time are sunrise and sunset in September in Miami?

In September, on the first day of the month, sunrise is at 7:01 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:08 pm EDT.

How long on average sun shines in September in Miami?

The average sunshine duration in September is 9.1h.

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

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

What is the UV index intensity in September in Miami?

In Miami, Florida, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.

Average temperature in September
Miami, FL

Average temperature in September - Miami, FL
  • Average high temperature in September: 85.6°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 (73°F).

  • Average low temperature in September: 81°F

The month with the highest average low temperature is August (82.6°F).
The coldest month (with the lowest average low temperature) is January (65.1°F).

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Average pressure in September
Miami, FL

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

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

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Average wind speed in September
Miami, FL

Average wind speed in September - Miami, FL
  • Average wind speed in September: 8.5mph

The windiest month (with the highest average wind speed) is March (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).

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Average humidity in September
Miami, FL

Average humidity in September - Miami, 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 (70%).

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Average rainfall in September
Miami, FL

Average rainfall in September - Miami, FL
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is August (2.8").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in September
Miami, FL

Average rainfall days in September - Miami, FL
  • Average rainfall days in September: 24.5 days

The month with the highest number of rainy days is September (24.5 days).
The month with the least rainy days is February (8.7 days).

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Average sea temperature in September
Miami, FL

Average sea temperature in September - Miami, 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
Miami, FL

Average daylight in September / Average sunshine in September - Miami, FL
  • Average daylight in September: 12h and 17min

The month with the longest days is June (Average daylight: 13h and 43min).
The month with the shortest days is December (Average daylight: 10h and 34min).

  • Average sunshine in September: 9h and 6min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).

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Average sunshine days in September
Miami, FL

Average sunshine days in September - Miami, FL
  • Average sunshine days in September: 3.2 days

The month with the most sunshine days is March (17 days).
The month with the least sunshine days is September (3.2 days).

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Average UV index in September
Miami, FL

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

The months with the highest UV index are May, June, July, August, September and October (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
Miami, FL

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

The month with the most cloud cover is October (Cloud cover 35).
The month with the least cloud cover is April (Cloud cover 26).

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Average visibility in September
Miami, FL

Average visibility in September - Miami, 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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