Scattered showers and thunderstorms expected as tropical wave affects St Lucia weather August 22 2025
Castries, St Lucia — St Lucia weather August 22 2025 is being shaped by a tropical wave, which forecasters say will bring scattered showers and a risk of isolated thunderstorms across the island, according to the Saint Lucia Meteorological Services.
Scattered showers and thunderstorms likely
Forecaster Webster Gajadhar reported that conditions at Hewanorra Airport at 6 a.m. were partly cloudy with showers nearby. The temperature stood at 28°C (82°F), following a minimum of 26°C (79°F) overnight. Relative humidity measured 80 percent, while southeast winds were blowing at 9 mph (15 km/h).
Rainfall update: Hewanorra recorded 0.5 millimeters of rain during the 24-hour period ending at 2 a.m., bringing the August total so far to 56.4 millimeters. Sunset today will be at 6:21 p.m., with sunrise tomorrow at 5:51 a.m.
Across the island, winds will remain from the southeast near 14 mph (22 km/h), becoming lighter or calm at intervals. The forecast calls for partly cloudy skies, turning cloudy at times, with scattered showers and isolated thunderstorms possible.
Marine forecast and tide updates
Seas around St Lucia are expected to remain slight to moderate, with waves between 3 and 5 feet (0.9 to 1.5 meters).
In Castries Harbour, tides will be low at 9:22 a.m. and high at 3:47 p.m. In Vieux Fort Bay, tides will be low at 10:49 a.m. and high at 4:54 p.m. The marine forecast advises caution, as passing showers or thunderstorms could temporarily cause rougher seas.
Regional weather outlook
For the Lesser Antilles, conditions will be partly cloudy, becoming cloudy at intervals with scattered showers and isolated thunderstorms.
Meteorologists warn that the tropical wave influencing today’s weather carries a high chance of developing into a tropical depression this weekend as it moves north of the northern Leeward Islands.
Another tropical wave, located in the central tropical Atlantic and moving westward at 17 mph (28 km/h), has a medium chance of development in the coming days. Meanwhile, a third wave has emerged off the coast of West Africa, moving westward at 6 mph (9 km/h).
Weekend forecast
The Saint Lucia Meteorological Services cautions that unsettled weather is likely to persist into the weekend, with periods of heavy showers and thunderstorms expected as tropical disturbances continue to track across the Caribbean.
For reference, yesterday’s forecast can be viewed here: St Lucia weather August 21 2025.
Residents are urged to stay alert to official advisories as conditions evolve.
For the latest updates on weather conditions and other breaking news, follow Unitedpac St Lucia News.
