September weather forecast
Saint Lucia

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Flag of Saint Lucia

Weather in September

September in Saint Lucia sees the rainy season continuing in full force, with the island experiencing high levels of rainfall. Despite this, the tropical heat remains steady, with average temperatures ranging from 25°C (77°F) during the cooler nights to 31°C (87.8°F) in the peak daytime heat.

September typically records the highest rainfall of the year, with the monthly average reaching approximately 235mm (9.25"). These rains are often intense, though usually brief, and predominantly occur in the afternoon and evening. Yet, in true tropical style, September also provides many hours of sunshine, ensuring Saint Lucia's landscapes continue to thrive and attract visitors.

Whether in the capital Castries, the picturesque Soufrière, or the bustling Rodney Bay, the weather conditions remain consistent across the island. Coastal areas, as usual, enjoy the soothing effect of the sea breezes, which bring welcome relief during the humid evenings.

As September gives way to October, the climatic conditions exhibit minor changes. The temperatures maintain their tropical range, but there is a slight reduction in rainfall as Saint Lucia begins to transition out of the peak of the rainy season. However, the island's weather remains characteristically warm and vibrant.

  • Gros Islet - September »
    In Gros Islet in September, during 25 rainfall days, 224mm (8.82") of precipitation is typically accumulated. September in Gros Islet becomes the month with the most rainfall days, counting a total of 25.
  • Vieux Fort - September »
    With an average sea temperature of 29.6°C (85.3°F), September is the month with the warmest seawater in Vieux Fort, Saint Lucia. With an average sea temperature of 29.6°C (85.3°F), September is the month with the warmest seawater in Vieux Fort, Saint Lucia.
  • Dennery - September »
    The month with the warmest seawater in Dennery is September, with an average sea temperature of 29.6°C (85.3°F). With an average sea temperature of 29.6°C (85.3°F), September is the month with the warmest seawater in Dennery.
  • Micoud - September »
    With an average sea temperature of 29.6°C (85.3°F), September is the month with the warmest seawater in Micoud. In Micoud during September, the rain falls for 19.5 days and regularly aggregates up to 64mm (2.52") of precipitation.
  • Marigot Bay - September »
    September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Marigot Bay. September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Marigot Bay.
  • Anse La Raye - September »
    The months with the warmest seawater in Anse La Raye are September and October, with an average sea temperature of 29°C (84.2°F). The months with the lowest humidity in Anse La Raye are January through March and September, with an average relative humidity of 73%.
  • Canaries - September »
    Canaries's September weather, marked by an average high temperature of 30.3°C (86.5°F) and an average low temperature of 27°C (80.6°F), is the warmest in the year. September in Canaries, Saint Lucia marks the beginning of the slow and steady descent towards autumn, characterized by a decline in humidity, rainfall, and temperatures.
  • Praslin - September »
    In Praslin in September, during 19.5 rainfall days, 64mm (2.52") of precipitation is typically accumulated. Signalling the transition towards the end of the rainy season, September experiences a reduction in rainfall to 64mm (2.52") in Praslin, Saint Lucia.
  • Cap Estate - September »
    September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Cap Estate. In Cap Estate the average seawater temperature in September is 29°C (84.2°F).
  • Babonneau - September »
    The months with the lowest humidity in Babonneau are January through March and September, with an average relative humidity of 73%. In Babonneau, Saint Lucia, in September, during 20.3 rainfall days, 63mm (2.48") of precipitation is typically accumulated.
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