August 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 August

August is the month when Miami, Florida experiences its peak summer weather conditions. The weather characteristic that stands out this month is the yearly maximum night-time temperature of 82.6°F (28.1°C). Compared to July, the onset of August brings with it similar temperatures but with slightly more rainfall. Despite enduring the peak of the heat, the afternoons are usually cooled off by the recurring pattern of thunderstorms. While conditions remain warm, September brings the promise of slightly cooled temperatures and reduced rainfall.

Temperature

Miami experiences its highest average temperatures in August, reaching a peak of 87.1°F (30.6°C) and a minimum of 82.6°F (28.1°C).

Heat index

The heat index value during August is computed to be 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.
The standards for the heat index are set for locations in shade and under light breezes. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

The average relative humidity in August is 72%.

Rainfall

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

Ocean temperature

August is the month with the warmest seawater, with an average ocean temperature of 86.5°F (30.3°C).
Note: For those looking to cool down, water temperatures above 86°F (30°C) might not be ideal.

Daylight

In Miami, the average length of the day in August is 13h and 1min.
On the first day of August in Miami, 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

In Miami, Florida, the average sunshine in August is 10.6h.

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 estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: During August, 7 as the daily maximum UV index converts into the following advice:
Deter overexposure. Protecting against the sun's effects is essential. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
Updated: Jun 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the hottest?

Miami notes the warmest temperatures in August, with a average high of 87.1°F (30.6°C) and a low of 82.6°F (28.1°C).

How hot is August?

In Miami, 87.1°F (30.6°C) is the average high-temperature and 82.6°F (28.1°C) is the average low-temperature during August. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 98.6°F (37°C).

What is the average humidity in August?

In August, the average relative humidity is 72%.

What is the rainiest month?

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

How much does it rain in August?

In August, the rain falls for 22.1 days. Throughout August, 2.8" (71mm) of precipitation is accumulated.

What month is the ocean warmest?

August is the month with the warmest seawater, with an average ocean temperature of 86.5°F (30.3°C).

How warm is the water in August?

In Miami, in August, the average water temperature is 86.5°F (30.3°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?

The average day length in August is 13h and 1min.

What time are sunrise and sunset in August in Miami?

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.

How long on average sun shines in August?

In August, the average sunshine duration is 10.6h.

What is the month with the highest UV index?

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

How high is the UV index in August in Miami?

The average daily maximum UV index in August is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in August
Miami, FL

Average temperature in August - Miami, 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, FL

Average pressure in August - Miami, 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, FL

Average wind speed in August - Miami, 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, FL

Average humidity in August - Miami, 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, FL

Average rainfall in August - Miami, 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, FL

Average rainfall days in August - Miami, 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, FL

Average sea temperature in August - Miami, FL
  • Average sea temperature in August: 86.5°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).

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

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

Average sunshine days in August - Miami, 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, FL

Average UV index in August - Miami, 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, FL

Average cloud cover in August - Miami, 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, FL

Average visibility in August - Miami, 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, Florida, USA

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