Miami
Florida, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Miami, FL

May, the last month of the spring, in Miami, is also a moderately hot month, with average temperature varying between 82°F (27.8°C) and 77°F (25°C).

Temperature

In May, the average high-temperature is almost the same as in April - a still warm 82°F (27.8°C). In May, in Miami, the average low-temperature is 77°F (25°C).

Heat index

The average heat index is appraised at a hot 86.9°F (30.5°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, clothing, pregnancy, 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.

Humidity

In Miami, the average relative humidity is 72%.

Rainfall

In Miami, during May, the rain falls for 15.3 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, there are 182.7 rainfall days, and 16.38" (416mm) of precipitation is accumulated.

Ocean temperature

In May, the average ocean temperature is 81.1°F (27.3°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 Miami, the average length of the day in May is 13.4h.

Sunshine

In May, the average sunshine is 10.7h.

UV index

May through October, with an average maximum UV index of 7, are months with the highest UV index in Miami. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.

What is the temperature in May in Miami?

In May, in Miami, Florida, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 77°F (25°C). In May, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that calculates temperature value influenced by the moisture in the air, is estimated at 86.9°F (30.5°C).

What is the average humidity in May in Miami?

The average relative humidity in May in Miami is 72%.

How many days does it rain in May in Miami?

In Miami, during May, the rain falls for 15.3 days and regularly aggregates up to 1.77" (45mm) of precipitation.

How warm is the water in May in Miami?

In May, the average ocean temperature in Miami, Florida, is 81.1°F (27.3°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 Miami have in May?

In Miami, the average length of the day in May is 13.4h.

How long on average sun shines in May in Miami?

In May, the average sunshine is 10.7h.

When is the highest UV index in Miami?

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

What is the UV index reading in May in Miami?

In Miami, the average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to the Sun's UV rays.
Average temperature in May - Miami, FL
  • Average high temperature in May: 27.8°C

The warmest month (with the highest average high temperature) is August (30.6°C).
The month with the lowest average high temperature is January (22.8°C).

  • Average low temperature in May: 25°C

The month with the highest average low temperature is August (28.1°C).
The coldest month (with the lowest average low temperature) is January (18.4°C).

Average humidity in May - Miami, FL
  • Average humidity in May: 72%

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

Average rainfall in May - Miami, FL
  • Average rainfall in May: 45mm

The wettest month (with the highest rainfall) is August (71mm).
The driest month (with the least rainfall) is January (11mm).

Average rainfall days in May - Miami, FL
  • Average rainfall days in May: 15.3 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 May - Miami, FL
  • Average sea temperature in May: 27.3°C

The best month for swimming (with the highest average sea temperature) is August (30.3°C).
The coldest month (with the lowest average sea temperature) is February (23.3°C).

Average daylight in May / Average sunshine in May - Miami, FL
  • Average daylight in May: 13.4h

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 May: 10.7h

The month with the most sunshine is July (Average sunshine: 11.1h).
The month with the least sunshine is December (Average sunshine: 6.4h).

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

Months with the highest UV index are May, June, July, August, September and October (UV index 7).
Months with the lowest UV index are January and December (UV index 5).