September weather forecastSan Luis, Cuba

Weather in September

September brings about a slight cooling effect to the otherwise warm city of San Luis, with temperatures peaking at a lesser 31.2°C (88.2°F). Cloud coverage and humidity levels are slightly elevated relative to the prior month, signifying the onset of cooling trends. Changes in weather conditions are indicative, as rainfall surges to 125mm (4.92") over 26.5 days, marking the zenith for the latter half of the year. Neutral pressure readings substantiate these conditions. Hence, September marks a shift to a cooler and wetter climatic phase.

Temperature

September's average high-temperature stands at a still tropical 31.2°C (88.2°F), showing little deviation from August's 31.8°C (89.2°F). In September, the average low-temperature in San Luis records at a pleasant 22.6°C (72.7°F) during the nights.

Heat index

For September, the heat index is estimated at a blisteringly hot 42°C (107.6°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

In San Luis, the average relative humidity in September is 81%.

Rainfall

In San Luis, during September, the rain falls for 26.5 days and regularly aggregates up to 125mm (4.92") of precipitation. Throughout the year, in San Luis, there are 242.5 rainfall days, and 898mm (35.35") of precipitation is accumulated.

Daylight

In San Luis, 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, sunrise is at 06:54 and sunset at 18:52 CDT.

Sunshine

In San Luis, the average sunshine in September is 10.8h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: During September, 7 as the daily maximum UV index converts into the following advice:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.