September weather forecast
Miami, FL

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

Weather in September

In September, Miami, Florida experiences a gradual decline in temperature marking the end of the sweltering summer season. The saturated air, attaining the year's highest humidity of 73%, is a significant feature this month. Compared to the preceding month, September is cooler yet maintains a similar pattern of afternoon thunderstorms. The city starts to witness a decrease in temperature and humidity, providing a respite from the peak summer conditions. Moving into October, residents can expect the onset of drier and more pleasant weather conditions.

Temperature

As Miami transitions into September, the average high-temperature stands at a warm 85.6°F, offering little variation from the preceding month. Miami encounters a small divergence from daytime high temperatures, averaging a low-temperature of 81°F during September nights.

Heat index

In September, the heat index is calculated to be a torrid 95°F. Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild 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 'felt air temperature' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

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" of precipitation. Throughout the year, in Miami, there are 182.7 rainfall days, and 16.38" of precipitation is accumulated.

Ocean temperature

In Miami, the average seawater temperature in September is 85.5°F.
Note: Water temperatures from 77°F to 84.2°F make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.

Daylight

The average length of the day in September 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 Miami, Florida, the average sunshine in September is 9.1h.

UV index

The months with the highest UV index are May through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, an average UV index of 7 transforms into the following instructions:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Caution! The Sun's UV rays become stronger due to reflections from water and sand.
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FAQ

How hot is September in Miami?

In Miami, in September, the average high-temperature is 85.6°F, and the average low-temperature is 81°F. The average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in September is calculated to be 95°F.

What is the average humidity in September in Miami?

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

How many days does it rain in September in Miami?

In Miami, Florida, in September, during 24.5 rainfall days, 1.93" of precipitation is typically accumulated.

How warm is the water in September in Miami?

In September, the average ocean temperature is 85.5°F. For any water activity, surface water temperatures between 77°F and 84.2°F are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Miami have in September?

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

What time are sunrise and sunset in September in Miami?

On the first day of September in Miami, Florida, 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?

In September, the average sunshine duration is 9.1h.

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

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

What is the UV index intensity in September in Miami?

In September, the average daily maximum UV index in Miami, Florida, is 7. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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 2min

The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).

  • Average sunshine in September: 9h and 1min

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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Miami, Florida, USA

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