September weather forecast
Santiago de Cuba, Cuba

September weather patterns in Santiago de Cuba mirror those of the previous month, with no significant changes in the city's climatological conditions. The city sees the highest rainfall of the year, amounting to 68mm (2.68"). Nevertheless, the sea temperature remains decidedly warm at 29.9°C (85.8°F), welcoming an array of water activities. Reliable wind and visibility conditions further contribute to relative climatic stability. October is forecasted to follow similar weather trends.

Temperature

September denotes a minimal variation in the average high-temperature to a still hot 31.2°C (88.2°F) from August's 31.8°C (89.2°F). Throughout the nights in September, Santiago de Cuba experiences an average low-temperature of 23.2°C (73.8°F).

Heat index

In September, the heat index is calculated to be a scorching 42°C (107.6°F). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In September, the average relative humidity is 80%.

Rainfall

In September, the rain falls for 18.2 days. Throughout September, 63mm (2.48") of precipitation is accumulated. Throughout the year, in Santiago de Cuba, there are 183.7 rainfall days, and 516mm (20.31") of precipitation is accumulated.

Sea temperature

The month with the warmest seawater is September, with an average sea temperature of 29.9°C (85.8°F).
Note: Swimming, diving, and other water activities in the temperature range of 25°C (77°F) to 29°C (84.2°F) are perceived as very enjoyable and comfortable for prolonged durations.

Daylight

The average length of the day in September is 12h and 15min.
On the first day of the month, sunrise is at 06:47 and sunset at 19:18. On the last day of September, in Santiago de Cuba, sunrise is at 06:54 and sunset at 18:52 CDT.

Sunshine

The average sunshine in September is 10.7h.

UV index

The months with the highest UV index in Santiago de Cuba are April through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 7 during September leads to these advisories:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Notice! The reflection of water and sand increases the UV radiation significantly.