September weather forecast and climate
Havana, Cuba

The front yard of the Gran Teatro in Havana, Cuba, with a display of colored vintage cars
The front yard of the Gran Teatro in Havana, Cuba, with a display of colored vintage cars
The first month of the autumn, September, is still a tropical month in Havana, Cuba, with temperature in the range of an average low of 23.8°C (74.8°F) and an average high of 31°C (87.8°F).

Temperature

In September, the average high-temperature is relatively the same as in August - a still tropical 31°C (87.8°F). The average low-temperature, in September, is 23.8°C (74.8°F).

Heat index

The average heat index in September is calculated to a scorching 40.5°C (104.9°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, clothing, metabolic differences, and differences in body mass, height, and shape 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 particularly important for children. 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. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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 September, the average relative humidity in Havana is 79%.

Rainfall

In Havana, Cuba, during 10 rainfall days, 144.4mm (5.69") of precipitation is typically accumulated. Throughout the year, in Havana, there are 80 rainfall days, and 1189.2mm (46.82") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature is 29.4°C (84.9°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In Havana, the average length of the day in September is 12.3h.

Sunshine

The month with the most sunshine in Havana is September, with an average of 10h of sunshine.

UV index

The average daily maximum UV index is 11. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 11 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Havana?

In Havana, in September, the average high-temperature is 31°C (87.8°F), and the average low-temperature is 23.8°C (74.8°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that combines both air temperature and relative humidity, in September is appraised at 40.5°C (104.9°F).

What is the average humidity in September in Havana?

The average relative humidity in September in Havana is 79%.

How much does it rain in Havana in September?

In Havana, Cuba, in September, it is raining for 10 days, with typically 144.4mm (5.69") of accumulated precipitation.

What is the water temperature in September in Havana?

In Havana, Cuba, the average seawater temperature in September is 29.4°C (84.9°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Havana have in September?

In September, the average length of the day is 12.3h.

What month has the most sunshine in Havana?

With an average of 10h of sunshine, September has the most sunshine of the year in Havana, Cuba.

How many hours of sunshine does Havana have in September?

In September, the average sunshine in Havana, Cuba, is 10h.

What is the UV index reading in September in Havana?

In September, the average daily maximum UV index is 11. A UV Index reading of 11, and higher, represents an extreme health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Havana, Cuba
  • Average high temperature in September: 31°C

The warmest month (with the highest average high temperature) is August (31.6°C).
The month with the lowest average high temperature is January (25.8°C).

  • Average low temperature in September: 23.8°C

The month with the highest average low temperature is August (24.1°C).
The coldest months (with the lowest average low temperature) are January and February (18.6°C).

Average humidity in September - Havana, Cuba
  • Average humidity in September: 79%

The month with the highest relative humidity is October (80%).
The month with the lowest relative humidity is April (72%).

Average rainfall in September - Havana, Cuba
  • Average rainfall in September: 144.4mm

The wettest month (with the highest rainfall) is June (182.3mm).
The driest month (with the least rainfall) is March (46.2mm).

Average rainfall days in September - Havana, Cuba
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is October (11 days).
Months with the least rainy days are March and April (3 days).

Average sea temperature in September - Havana, Cuba
  • Average sea temperature in September: 29.4°C

The best month for swimming (with the highest average sea temperature) is August (30.2°C).
The coldest month (with the lowest average sea temperature) is January (24.7°C).

Average daylight in September / Average sunshine in September - Havana, Cuba
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.5h).
The month with the shortest days is December (Average daylight: 10.7h).

  • Average sunshine in September: 10h

The month with the most sunshine is September (Average sunshine: 10h).
Months with the least sunshine are January, February, November and December (Average sunshine: 7).

Average UV index in September - Havana, Cuba
  • Average UV index in September: 11

Months with the highest UV index are April, May and June (UV index 12).
Months with the lowest UV index are January and December (UV index 6).