August weather forecast
Miami Beach, FL

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Clear blue waters of Miami Beach in Florida
Clear blue waters of Miami Beach in Florida

Weather in August

The weather in August sees little change from July’s hot and humid conditions. Miami Beach sees the highest rainfall amount of 2.8" (71mm) in August. The sweltering heat continues, coupled with high humidity making it the wettest month in terms of rainfall. The sea remains enjoyable for swimming, with warm temperatures sustained throughout. The heat combined with rainfall makes for a unique summer experience in this beach city.

Temperature

The warmest month is August, with an average high-temperature of 87.1°F (30.6°C) and an average low-temperature of 82.6°F (28.1°C).

Heat index

The heat index for August is appraised at a sweltering 98.6°F (37°C). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.
It is important to note that the heat index values are for shaded areas and light wind scenarios. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

In Miami Beach, the average relative humidity in August is 72%.

Rainfall

August is the month with the most rainfall. Rain falls for 22.1 days and accumulates 2.8" (71mm) of precipitation.

Ocean temperature

With an average ocean temperature of 86°F (30°C), August is the month with the warmest seawater.
Note: Waters that are warmer than 86°F (30°C) might not provide the cooling effect most people seek during hot days.

Daylight

In Miami Beach, the average length of the day in August is 13h and 1min.
On the first day of August, sunrise is at 6:47 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 7:40 pm EDT.

Sunshine

The average sunshine in August is 10.6h.

UV index

May through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 7 during August leads to these advisories:
Resist overexposure. Safeguarding from solar damage is indispensable. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. To cut down UV radiation exposure by about half, sport a wide-brim hat. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the warmest month in Miami Beach?

August, recording an average high temperature of 87.1°F (30.6°C) and a low temperature of 82.6°F (28.1°C), is Miami Beach's warmest month.

Is it hot in Miami Beach during August?

The high-temperature, in August, in Miami Beach, records 87.1°F (30.6°C), while the low-temperature is 82.6°F (28.1°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is appraised at 98.6°F (37°C).

What is the average humidity in August in Miami Beach?

In Miami Beach, the average relative humidity in August is 72%.

What is the wettest month in Miami Beach?

The month with the most rainfall in Miami Beach, Florida, is August, when the rain falls for 22.1 days and typically aggregates up to 2.8" (71mm) of precipitation.

How many days does it rain in August in Miami Beach?

In Miami Beach, Florida, during August, the rain falls for 22.1 days and regularly aggregates up to 2.8" (71mm) of precipitation.

What month is the ocean warmest in Miami Beach?

August is the month with the warmest seawater, with an average ocean temperature of 86°F (30°C).

How warm is the water in August in Miami Beach?

In August, the average ocean temperature is 86°F (30°C). For swimming, other intense water activities, temperature above 86°F (30°C) is arguably unpleasant, as the water cooling effect is missing.

What is the average length of the day in August in Miami Beach?

In Miami Beach, Florida, the average day length in August is 13h and 1min.

When are sunrise and sunset in August in Miami Beach?

In August, on the first day of the month, sunrise is at 6:47 am and sunset at 8:06 pm. On the last day of the month, in Miami Beach, Florida, sunrise is at 7:00 am and sunset at 7:40 pm EDT.

How long on average sun shines in August in Miami Beach?

The average sunshine duration in August in Miami Beach, Florida, is 10.6h.

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

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

What is the UV index reading in August in Miami Beach?

The average daily maximum UV index in August in Miami Beach, Florida, is 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Miami Beach, FL

Average temperature in August - Miami Beach, FL
  • Average high temperature in August: 87.1°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 August: 82.6°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).

Average pressure in August
Miami Beach, FL

Average pressure in August - Miami Beach, FL
  • Average pressure in August: 29.99"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).

Average wind speed in August
Miami Beach, FL

Average wind speed in August - Miami Beach, FL
  • Average wind speed in August: 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).

Average humidity in August
Miami Beach, FL

Average humidity in August - Miami Beach, FL
  • Average humidity in August: 72%

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

Average rainfall in August
Miami Beach, FL

Average rainfall in August - Miami Beach, FL
  • Average rainfall in August: 2.8"

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

Average rainfall days in August
Miami Beach, FL

Average rainfall days in August - Miami Beach, FL
  • Average rainfall days in August: 22.1 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).

Average sea temperature in August
Miami Beach, FL

Average sea temperature in August - Miami Beach, FL
  • Average sea temperature in August: 86°F

The best month for swimming (with the highest average sea temperature) is August (86°F).
The coldest months (with the lowest average sea temperature) are January, February and March (75°F).

Average daylight in August /
Average sunshine in August
Miami Beach, FL

Average daylight in August / Average sunshine in August - Miami Beach, FL
  • Average daylight in August: 13h and 0min

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 August: 10h and 4min

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).

Average sunshine days in August
Miami Beach, FL

Average sunshine days in August - Miami Beach, FL
  • Average sunshine days in August: 4.4 days

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

Average UV index in August
Miami Beach, FL

Average UV index in August - Miami Beach, FL
  • Average UV index in August: 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).

Average cloud cover in August
Miami Beach, FL

Average cloud cover in August - Miami Beach, FL
  • Average cloud cover in August: 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).

Average visibility in August
Miami Beach, FL

Average visibility in August - Miami Beach, FL
  • Average visibility in August: 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).

Miami Beach, Florida, USA

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