Forecast highlights showers, thunderstorms, and possible storm development
CASTRIES, St Lucia, — St Lucia weather August 23 2025 is expected to bring generally fair skies, shifting at times to cloudy conditions with scattered showers and the possibility of isolated thunderstorms, the Saint Lucia Meteorological Services reported in its 6:00 a.m. forecast.
Forecaster Vigil Saltibus said winds will blow from the east to northeast at around 16 mph (26 km/h). Marine conditions remain slight to moderate with waves between 3 to 6 feet, but authorities are urging caution as tropical activity in the Atlantic shows signs of intensifying.
Current conditions at Hewanorra Airport
Early Saturday morning, skies over Hewanorra International Airport were partly cloudy with a temperature of 27°C (81°F). Last night’s minimum temperature held steady at the same mark. Relative humidity stood at 84 percent, with winds from the east-northeast at 9 mph (15 km/h).
Rainfall in the 24-hour period ending at 8:00 p.m. Friday measured 0.9 mm, bringing the total for August so far to 57.3 mm. Sunset today is expected at 6:21 p.m., with sunrise on Sunday at 5:51 a.m.
Marine forecast and tide updates
Seas around St Lucia will remain slight to moderate through the day. Tides for Castries Harbour will be low at 9:53 a.m. before rising high at 4:14 p.m. In Vieux Fort Bay, tides will fall low at 11:20 a.m. and peak high at 5:21 p.m.
Weather outlook for the Lesser Antilles
Across the Lesser Antilles, skies are forecast to be partly cloudy, turning cloudy at times with widely scattered showers and isolated thunderstorms. Meteorologists expect heightened instability, especially over the northern half of the region.
Tropical weather developments
A tropical wave currently affecting the eastern Caribbean will bring periods of showers and isolated thunderstorms over the next 24 hours. According to the Saint Lucia Meteorological Services, there is a high chance of this system strengthening into a tropical depression this weekend as it moves north of the northern Leeward Islands.
A second tropical wave is advancing across the central tropical Atlantic at about 20 mph (33 km/h). Although it carries a low chance of development, it is expected to reach the Lesser Antilles by Monday. A third wave further east is moving more slowly at 12 mph (19 km/h) with limited prospects for development at this stage.
Advisory to residents
With multiple tropical waves active in the Atlantic basin, forecasters are urging residents and mariners to stay vigilant as the peak of the hurricane season approaches. Authorities advise close monitoring of official weather updates and preparedness for sudden changes in conditions.
Stay with Unitedpac St Lucia News for more updates on St Lucia weather and breaking news developments across the island and the wider Caribbean.
