September
Weather in Saint Lucia for September 2025
Your guide to Saint Lucia weather in September - trends and predictions
In general, the average temperature in Saint Lucia at the beginning of September is 30 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 30.1 °C by the end of September.
Saint Lucia experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
Is September a good time to visit Saint Lucia? check out the best time to travel to Saint Lucia page.
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8
Dry days
22
Rainy days
0
Snow days
30°/27°
Temperatures
19 km/h
Avg max wind
74 %
Avg humidity
Saint Lucia in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  30° | 2  30° | 3 30° | 4 30° | 5 30° | 6 30° | 7 30° |
| 8 30° | 9 31° | 10 30° | 11 31° | 12  30° | 13 30° | 14 31° |
| 15 30° | 16 30° | 17 30° | 18  31° | 19 31° | 20 31° | 21 31° |
| 22 31° | 23 30° | 24  30° | 25  30° | 26 30° | 27 30° | 28 30° |
| 29 31° | 30 30° |
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Temperatures trend during September in Saint Lucia
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 30° /27° | 4.6 mm | 7 | |
| 2 Sept. | Patchy light rain with thunder | 30° /26° | 10.5 mm | 7 | |
| 3 Sept. | Light rain shower | 30° /26° | 3 mm | 7 | |
| 4 Sept. | Patchy rain possible | 30° /27° | 2.5 mm | 7 | |
| 5 Sept. | Patchy rain possible | 30° /27° | 1.1 mm | 7 | |
| 6 Sept. | Patchy rain possible | 30° /27° | 0.7 mm | 7 | |
| 7 Sept. | Patchy rain possible | 30° /27° | 1.4 mm | 7 | |
| 8 Sept. | Light rain shower | 30° /26° | 1.2 mm | 7 | |
| 9 Sept. | Patchy rain possible | 31° /26° | 2.2 mm | 7 | |
| 10 Sept. | Patchy rain possible | 30° /27° | 13 mm | 7 | |
| 11 Sept. | Patchy rain possible | 31° /27° | 5.2 mm | 7 | |
| 12 Sept. | Partly cloudy | 30° /27° | 2.3 mm | 8 | |
| 13 Sept. | Partly cloudy | 30° /27° | 3.5 mm | 8 | |
| 14 Sept. | Partly cloudy | 31° /27° | 3.1 mm | 8 | |
| 15 Sept. | Partly cloudy | 30° /27° | 1.2 mm | 8 | |
| 16 Sept. | Patchy rain possible | 30° /27° | 1.6 mm | 7 | |
| 17 Sept. | Patchy rain possible | 30° /27° | 1.8 mm | 7 | |
| 18 Sept. | Sunny | 31° /26° | 0.8 mm | 8 | |
| 19 Sept. | Patchy rain possible | 31° /27° | 2.6 mm | 7 | |
| 20 Sept. | Patchy light rain with thunder | 31° /27° | 1.3 mm | 7 | |
| 21 Sept. | Patchy light rain with thunder | 31° /28° | 1.1 mm | 8 | |
| 22 Sept. | Patchy rain possible | 31° /27° | 1.5 mm | 7 | |
| 23 Sept. | Patchy rain possible | 30° /27° | 3.8 mm | 7 | |
| 24 Sept. | Moderate or heavy rain shower | 30° /27° | 7.3 mm | 7 | |
| 25 Sept. | Patchy light rain | 30° /28° | 2.6 mm | 7 | |
| 26 Sept. | Patchy rain possible | 30° /27° | 11 mm | 7 | |
| 27 Sept. | Light rain shower | 30° /27° | 5.4 mm | 7 | |
| 28 Sept. | Partly cloudy | 30° /26° | 0.9 mm | 8 | |
| 29 Sept. | Patchy rain possible | 31° /27° | 0.5 mm | 7 | |
| 30 Sept. | Patchy rain possible | 30° /27° | 1.7 mm | 7 | |
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Important Notice
Our weather forecast for Saint Lucia in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Saint Lucia forecast closer to your planned date for the most up-to-date weather information.
Saint Lucia in September - FAQ
What are the expected maximum and minimum temperatures in Saint Lucia during September?
During September, expect a variety of temperatures with highs around 30° and lows near 27°, suitable for diverse activities and preferences.
How much rainfall should be expected in Saint Lucia during September?
Moderate rainfall is anticipated in Saint Lucia during September, with a total of 75.8 mm spread over approximately 22 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Saint Lucia during September?
The average wind speed in Saint Lucia during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Saint Lucia in September?
As you prepare for your trip to Saint Lucia in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Saint Lucia, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Sandals/Flip-flops: Comfortable for warm climates
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
- Insect Repellent: For destinations with mosquitos or other insects
September rainfall patterns in Saint Lucia
Explore the daily rainfall trends and prepare for Saint Lucias September weather 💧
UV exposure in Saint Lucia during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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