September weather forecast
Old Man Bay, Cayman Islands

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Weather in September

September's weather offers slight relief from the peak summer heat in Old Man Bay, indicating the beginnings of autumn. Travellers can expect enjoyable, slightly cooler evenings and pleasant mornings. Occasional afternoon showers can be expected, a respite from the hot days. Lounge by the sea, feel the reduced heat, and enjoy clear skies as the month concludes. The weather data shows a significant drop in wind speed, descending to 17.2km/h (10.7mph), adding to the gentler weather conditions.

Temperature

The arrival of September marks a slight shift to an average high-temperature of a still moderately hot 29.4°C (84.9°F) from August's 29.7°C (85.5°F). Nights in Old Man Bay during September maintain a steady temperature, averaging at a still moderately hot 28.5°C (83.3°F).

Heat index

September's heat index is evaluated at a hot 34°C (93.2°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Data suggests that the heat index is set for environments in shade and with a light wind. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.

Humidity

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

Rainfall

In September, in Old Man Bay, the rain falls for 19.9 days. Throughout September, 81mm (3.19") of precipitation is accumulated. In Old Man Bay, during the entire year, the rain falls for 241.1 days and collects up to 854mm (33.62") of precipitation.

Daylight

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

Sunshine

The average sunshine in September in Old Man Bay, Cayman Islands, 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 health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Prevent overexposure. Protection from the sun's harmful effects is needed. 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. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
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Frequently asked questions

How hot is it in Old Man Bay in September?

The average high-temperature and low-temperature in Old Man Bay, Cayman Islands, during September are 29.4°C (84.9°F) and 28.5°C (83.3°F) respectively. In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is evaluated at 34°C (93.2°F).

What is the least humid month in Old Man Bay?

With an average relative humidity of 74%, September is the least humid month in Old Man Bay.

What is the average humidity in September in Old Man Bay?

In September, the average relative humidity in Old Man Bay, Cayman Islands, is 74%.

How many days does it rain in September in Old Man Bay?

In Old Man Bay, Cayman Islands, in September, it is raining for 19.9 days, with typically 81mm (3.19") of accumulated precipitation.

How many hours of daylight does Old Man Bay have in September?

The average day length in September in Old Man Bay is 12h and 14min.

When is the sunrise / sunset in September in Old Man Bay?

On the first day of September in Old Man Bay, Cayman Islands, sunrise is at 06:09 and sunset at 18:39. On the last day of the month, sunrise is at 06:15 and sunset at 18:13 EST.

How long on average sun shines in September in Old Man Bay?

In September, the average sunshine duration in Old Man Bay is 9h.

What is the month with the highest UV index in Old Man Bay?

The months with the highest UV index in Old Man Bay are February through December, with an average maximum UV index of 7.

What is the UV index intensity in September in Old Man Bay?

The average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation.

Average temperature in September
Old Man Bay, Cayman Islands

Average temperature in September - Old Man Bay, Cayman Islands
  • Average high temperature in September: 29.4°C

The warmest month (with the highest average high temperature) is August (29.7°C).
The month with the lowest average high temperature is February (26.2°C).

  • Average low temperature in September: 28.5°C

The month with the highest average low temperature is August (28.6°C).
The coldest month (with the lowest average low temperature) is March (24.9°C).

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Average pressure in September
Old Man Bay, Cayman Islands

Average pressure in September - Old Man Bay, Cayman Islands
  • Average pressure in September: 1012.4mbar

The month with the highest atmospheric pressure is January (1016.3mbar).
The month with the lowest atmospheric pressure is October (1011.7mbar).

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Average wind speed in September
Old Man Bay, Cayman Islands

Average wind speed in September - Old Man Bay, Cayman Islands
  • Average wind speed in September: 17.2km/h

The windiest month (with the highest average wind speed) is December (26.4km/h).
The calmest month (with the lowest average wind speed) is September (17.2km/h).

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Average humidity in September
Old Man Bay, Cayman Islands

Average humidity in September - Old Man Bay, Cayman Islands
  • Average humidity in September: 74%

The month with the highest relative humidity is June (79%).
The month with the lowest relative humidity is September (74%).

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Average rainfall in September
Old Man Bay, Cayman Islands

Average rainfall in September - Old Man Bay, Cayman Islands
  • Average rainfall in September: 81mm

The wettest month (with the highest rainfall) is October (159mm).
The driest month (with the least rainfall) is March (24mm).

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Average rainfall days in September
Old Man Bay, Cayman Islands

Average rainfall days in September - Old Man Bay, Cayman Islands
  • Average rainfall days in September: 19.9 days

The month with the highest number of rainy days is October (26.5 days).
The month with the least rainy days is March (16 days).

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Average daylight in September /
Average sunshine in September
Old Man Bay, Cayman Islands

Average daylight in September / Average sunshine in September - Old Man Bay, Cayman Islands
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).

  • Average sunshine in September: 9h and 0min

The months with the most sunshine are May and July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in September
Old Man Bay, Cayman Islands

Average sunshine days in September - Old Man Bay, Cayman Islands
  • Average sunshine days in September: 7.4 days

The month with the most sunshine days is March (9.3 days).
The month with the least sunshine days is November (2.5 days).

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Average UV index in September
Old Man Bay, Cayman Islands

Average UV index in September - Old Man Bay, Cayman Islands
  • Average UV index in September: 7

The months with the highest UV index are February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The month with the lowest UV index is January (UV index 6).

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Average cloud cover in September
Old Man Bay, Cayman Islands

Average cloud cover in September - Old Man Bay, Cayman Islands
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 41).
The month with the least cloud cover is April (Cloud cover 28).

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Average visibility in September
Old Man Bay, Cayman Islands

Average visibility in September - Old Man Bay, Cayman Islands
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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Old Man Bay, Cayman Islands

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