Caribbean
St Lucia weather by month
St Lucia is warmest in September, with average highs of 29°C, and coolest in January at 27°C. The sea ranges from about 27°C to 30°C, warmest in September.
- WarmestSeptember29°C average high
- CoolestJanuary27°C average high
- Warmest seaSeptember30°C on average
- From Dublin≈ 8h 30mdirect, estimated
St Lucia through the year
Beach weather (highs of 25°C or more and fewer than seven rainy days) is most likely February to March. August is the wettest month, with rain on about 16 days.
Month by month
| Month | High | Low | Sea | Rainy days | Rain | Sky | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 27° | 22° | 28° | 9 | 45 mm | Some cloud | 98% |
| February | 27° | 22° | 27° | 7 | 36 mm | Some cloud | 98% |
| March | 28° | 22° | 28° | 6 | 38 mm | Often cloudy | 100% |
| April | 28° | 23° | 28° | 8 | 45 mm | Often cloudy | 100% |
| May | 29° | 23° | 28° | 9 | 54 mm | Often cloudy | 100% |
| June | 29° | 24° | 29° | 11 | 68 mm | Often cloudy | 100% |
| July | 29° | 24° | 29° | 14 | 98 mm | Often cloudy | 100% |
| August | 29° | 24° | 30° | 16 | 104 mm | Often cloudy | 100% |
| September | 29° | 24° | 30° | 13 | 96 mm | Often cloudy | 100% |
| October | 29° | 24° | 30° | 14 | 96 mm | Often cloudy | 100% |
| November | 28° | 23° | 29° | 12 | 93 mm | Often cloudy | 100% |
| December | 27° | 23° | 28° | 7 | 47 mm | Some cloud | 99% |
Shaded rows: beach weather (February to March). Rainy day = 2 mm or more. Sky = average cloud cover. How we measure
Flying time
Estimated from the distance for a direct flight. Real schedules vary, and many long-haul trips need a connection.
- From Dublin≈ 8h 30m
- From Cork≈ 8h 15m
- From Belfast≈ 8h 30m
- From London≈ 8h 45m
- From Manchester≈ 8h 45m
- From Glasgow≈ 8h 45m
Air: ERA5 reanalysis via Open-Meteo, 2011–2025, for the grid point at 13.91, -60.98 (277 m). Sea: Copernicus Marine analysis via Open-Meteo, 2023–2025. Averages describe past weather, not a forecast.