September weather forecast
Cayman Islands

September in the Cayman Islands marks the peak of the wet season, characterized by high temperatures and significant rainfall. The average temperature during September ranges from 28°C (82.4°F) to 31°C (87.8°F). Although slightly cooler than the peak summer months of July and August, the temperatures remain high, maintaining the hot, humid climate typical of the region.

Rainfall in September sees another substantial increase from August, with average precipitation reaching about 220mm (8.66"). This level of rainfall is among the highest experienced in the year, marking September as one of the rainiest months. This, coupled with the possibility of thunderstorms and hurricanes, make September one of the wettest periods in the Cayman Islands.

The weather conditions in September are consistent across all three islands: Grand Cayman, Cayman Brac, and Little Cayman. George Town, the capital on Grand Cayman, mirrors the general climate trends of the country, experiencing similar temperatures and high levels of rainfall.

Wind speeds in September remain around 15km/h (9.3mph), offering a cooling respite from the tropical heat. Daylight hours continue to shorten, with the islands receiving approximately 12.5 hours of daylight per day as the region moves towards the autumn equinox.

Despite the challenging weather conditions, there are still opportunities for visitors to enjoy the Cayman Islands in September. Water-based activities remain popular due to the warm sea temperatures, although caution is advised due to the increased risk of storms. Visitors should monitor weather forecasts closely as September falls within the hurricane season. The Islands also host the International Scuba Diving Hall of Fame Induction in September, celebrating the sport that is a significant attraction for the Cayman Islands.

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• George Town - September »
  August and September, with an average sea temperature of 29.9°C (85.8°F), are months with the warmest seawater in George Town, Cayman Islands. In George Town in September, during 9 rainfall days, 180mm (7.09") of precipitation is typically accumulated.
• West Bay - September »
  August and September, with an average sea temperature of 29.9°C (85.8°F), are months with the warmest seawater in West Bay, Cayman Islands. August and September, with an average sea temperature of 29.9°C (85.8°F), are months with the warmest seawater in West Bay.
• East End - September »
  The months with the warmest seawater in East End are August and September, with an average sea temperature of 29.9°C (85.8°F). September is the least humid month in East End with an average relative humidity of 74%.
• North Side - September »
  August and September, with an average sea temperature of 29.9°C (85.8°F), are months with the warmest seawater in North Side. In September, in North Side the rain falls for 19.9 days.
• Old Man Bay - September »
  In September, the average heat index, which combines relative humidity and air temperature, is evaluated at 34°C (93.2°F). On the first day of September in Old Man Bay sunrise is at 06:09 and sunset at 18:39.
• Half Way Pond - September »
  In Half Way Pond in September, during 19.9 rainfall days, 81mm (3.19") of precipitation is typically accumulated. In Half Way Pond in September, it is raining for 19.9 days, with typically 81mm (3.19") of accumulated precipitation.
• Gun Bay - September »
  The average heat index, which takes the relative humidity and factors it into the air temperature reading, in September is estimated at 34°C (93.2°F). September is the least humid month in Gun Bay, Cayman Islands, with an average relative humidity of 74%.
• Brinkleys - September »
  The least humid month in Brinkleys, Cayman Islands, is September, with an average relative humidity of 74%. In September, the average relative humidity in Brinkleys is 74%.
• Sand Bluff - September »
  September is the least humid month in Sand Bluff with an average relative humidity of 74%. In September, in Sand Bluff the rain falls for 19.9 days.
• Spot Bay - September »
  On the first day of September in Spot Bay sunrise is at 06:03 and sunset at 18:33. The average relative humidity in September in Spot Bay is 74%.
• Breakers - September »
  September is the least humid month in Breakers with an average relative humidity of 74%. September is the least humid month in Breakers, with an average relative humidity of 74%.