Weather in St. Lucia in september
Country-wide climate normals across 15 cities in St. Lucia.
How Hot Is St. Lucia in september?
St. Lucia bakes evenly in September — highs around 30°C are typical from Augier all the way to Canaries, with very little regional variation. Lows sit around 27°C even overnight, and the country's small geographic footprint means there are no significant climate pockets. Expect uniform heat day and night.
Sunshine in St. Lucia in september
St. Lucia sees limited sun in September: just 1.2h a day in Gros Islet, with heavy cloud cover common across most regions. Daylight runs from 5:50 am to 6:05 pm, but persistent grey skies and overcast stretches mean direct sunlight is genuinely scarce. Many days pass without any prolonged sunny spells.
Does It Rain In St. Lucia In september?
Wet conditions dominate St. Lucia in September — Gros Islet sees 142mm of rain across 19 days, with rain a near-daily feature in most regions. Some areas see considerably more, particularly mountain-facing or windward coasts. Plan around frequent showers and pack reliable rainwear.
Is St. Lucia Humid In september?
St. Lucia's September is humid — 75% on average in Gros Islet, with similar muggy conditions in most regions. Afternoons feel sticky, especially after rain, and the moisture amplifies warm-day temperatures noticeably. Coastal cities see the highest readings.
Wind In St. Lucia In september
Persistent breeze shapes St. Lucia's September: 22 kph in Gros Islet, with consistent wind across the country. The conditions are ideal for sailing and other wind sports, but can be disruptive for fine outdoor work.
Cloud Cover In St. Lucia In september
Heavy overcast covers St. Lucia in September: 77% cloud cover in Gros Islet, with similar grey conditions in most regions. Direct sun is rare, and the pattern is persistent across the country. Coastal and northern regions feel especially heavy.