Gros Islet Weather in September
In Gros Islet, September brings very high daytime temperatures around 31°C (88°F), with nights cooling to 26°C (79°F). Expect quite a bit of rainfall this month.
Rainfall in Gros Islet in September
Analyzing past climate data, one can expect approximately 24 days of rain, averaging 138 mm (5.4 in). Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Gros Islet in September
In September, Gros Islet sees very high temperatures, with highs of 31°C (88°F). Nights drop to around 26°C (79°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. Nights are warm at 26°C (79°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.
Sunshine in Gros Islet in September
The month enjoys around 238 hours of sunshine, creating mostly sunny days with good weather conditions.September in Gros Islet can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Lucia, check out our Gros Islet's climate page.
Gros Islet Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
31°C (88°F)
Chance of Rain
81%
Precipitation
138 mm (5.4 in)
Rainy days
24 days
Humidity
81% *
Sunshine
238 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Gros Islet typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Historical weather for Gros Islet in September
Browse day-by-day weather records for Gros Islet spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Gros Islet historical weather extremes in September
Based on weather observations in Gros Islet between 1990 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 3, 2003, with a maximum of 34°C (93°F).
- The lowest daytime temperature in September was 26°C (79°F), recorded on September 18, 2008.
- The lowest overnight temperature recorded in September was 19°C (66°F) (September 11, 2011).
Best Places in Saint Lucia in September
Find out more about the weather in Saint Lucia and which places have the best travel conditions in this month. See all of Saint Lucia in September →
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What to Wear in Gros Islet in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Gros Islet in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Lucia, check out our Gros Islet's climate page.
Temperature Rainfall Sunshine Humidity
See the full Gros Islet climate overview or explore weather in Saint Lucia.
