September weather forecast
Half Moon Bay, Cayman Islands

September is slightly cooler than August in Half Moon Bay but maintains a comfortable temperature range from 28.5°C (83.3°F) to 29.4°C (84.9°F). In this month, attention is drawn to the reduced wind speeds, dropping to a mellow 17.2km/h (10.7mph). It yields a tranquil atmosphere that complements the warm weather, remaining convenient for those seeking a relaxed tropical climate. Despite minor changes in other weather aspects, the island's attractiveness remains consistent, providing locals and tourists alike with a healthful blend of sunshine, calm winds, and moderate rainfall.

Temperature

In the transition from August to September, Half Moon Bay reports an average high-temperature of a still moderately hot 29.4°C (84.9°F), indicating a close resemblance to the prior month. Half Moon Bay's temperature during September nights registers a minor decrease to an average low of 28.5°C (83.3°F).

Heat index

The heat index value during September is computed to be a tropical 34°C (93.2°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Understanding the heat index involves considering values for shaded locales with light wind. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.

Humidity

September is the least humid month, with an average relative humidity of 74%.

Rainfall

In Half Moon Bay, in September, during 19.9 rainfall days, 81mm (3.19") of precipitation is typically accumulated. Throughout the year, in Half Moon Bay, there are 241.1 rainfall days, and 854mm (33.62") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 14min.
On the first day of the month, sunrise is at 06:09 and sunset at 18:39. On the last day of September, in Half Moon Bay, sunrise is at 06:15 and sunset at 18:13 EST.

Sunshine

In Half Moon Bay, the average sunshine in September is 9h.

UV index

The months with the highest UV index are February through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.