September weather forecast
Saint Kitts and Nevis

September in Saint Kitts and Nevis heralds a slight shift in the climate as temperatures begin to decrease slightly, averaging between 26°C (78.8°F) to 30°C (86°F). Although it is still the warm part of the year, the heat becomes less intense compared to the peak summer months.

Rainfall in September increases to approximately 120mm (4.72"), marking the progression of the wet season. The rains are typically short and sporadic, and the sun quickly reemerges, ensuring there are still plenty of opportunities to enjoy outdoor activities.

As has been the trend throughout the year, Nevis may experience slightly higher rainfall and marginally cooler temperatures due to its mountainous terrain. However, these differences are usually minor and do not significantly impact the overall warm and tropical climate of the federation.

The sea temperature in September remains consistent at 28°C (82.4°F), making it ideal for various water activities such as swimming, snorkeling, and boating. An average of 7 hours of sunshine per day still provides a substantial amount of daylight for visitors to explore the islands' attractions.

Wind conditions during September average around 26km/h (16.2mph). These breezes offer a refreshing counterbalance to the heat and contribute to a comfortable atmosphere, particularly for beach and seaside activities.

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• Basseterre - September »
  The months with the warmest seawater are September and October, with an average sea temperature of 29°C (84.2°F). In Basseterre during September, the rain falls for 18.3 days and regularly aggregates up to 50mm (1.97") of precipitation.
• Fig Tree - September »
  September is the month when Fig Tree experiences its warmest temperatures, averaging a high of 28.7°C (83.7°F) and a low of 27.7°C (81.9°F). Fig Tree welcomes September with marginally drier conditions, despite experiencing the highest rainfall of the year at 91mm (3.58").
• Nevis - September »
  September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Nevis, Saint Kitts and Nevis. March through September, with an average maximum UV index of 12, are months with the highest UV index in Nevis, Saint Kitts and Nevis.
• Dieppe Bay Town - September »
  With an average sea temperature of 29.4°C (84.9°F), September is the month with the warmest seawater in Dieppe Bay Town, Saint Kitts and Nevis. As September sets in, a decrease in sea temperature is recorded with a modest dip to 29.2°C (84.6°F), indicating the early signs of autumn in Dieppe Bay Town, Saint Kitts, and Nevis.
• Cotton Ground - September »
  In September, the average relative humidity in Cotton Ground, Saint Kitts and Nevis, is 77%. Cotton Ground's temperatures peak on average in September, reaching 28.8°C (83.8°F) at their highest and 27.8°C (82°F) at their lowest.
• Butlers - September »
  In Butlers in September, it is raining for 21.9 days, with typically 92mm (3.62") of accumulated precipitation. Butlers, Saint Kitts and Nevis, records the warmest temperatures in September, averaging a high of 28.8°C (83.8°F) and a low of 27.8°C (82°F).