Cloudy skies, scattered showers, and rough seas forecast in the St Lucia weather August 25 2025 update
CASTRIES, St Lucia — The St Lucia weather August 25 2025 forecast calls for partly cloudy skies becoming cloudy at times, with scattered light to moderate showers and the possibility of isolated thunderstorms across the island, according to the Saint Lucia Meteorological Services.
St Lucia weather August 25 2025 shows scattered showers at airports
At midday, weather conditions varied between the south and north of the island. Hewanorra Airport in Vieux Fort reported cloudy skies with nearby showers, while GFL Charles Airport in Castries recorded partly cloudy skies following morning rainfall. Temperatures at Hewanorra stood at 31°C (88°F) with humidity at 67 percent and southeast winds blowing at 16 mph (26 km/h).
Rainfall totals in the 24-hour period ending 8 a.m. showed 7.2 millimeters at Hewanorra and a significantly higher 30.5 millimeters at GFL Charles, underscoring localized heavy showers. For the month of August, cumulative rainfall has reached 76.7 millimeters in Vieux Fort and 68.6 millimeters in Castries.
Forecast details highlight cloudy intervals and thunderstorms
For St Lucia weather August 25 2025, forecasters expect winds shifting slightly east to east-southeast, averaging 18 mph (30 km/h). Residents can anticipate intervals of sunshine mixed with cloudy periods, punctuated by scattered showers. Meteorologist Webster Gajadhar noted that some of these showers could intensify, with isolated thunderstorms possible in the late afternoon or evening.
Sunset is expected at 6:19 p.m., with sunrise on Tuesday at 5:51 a.m.
Marine forecast urges caution for small craft operators
Seas around St Lucia are projected to be moderate to locally rough, with waves and northeasterly swells ranging from 5 to 7 feet (1.5 to 2.1 meters). Authorities have advised small craft operators and sea bathers to exercise caution due to above-normal sea conditions.
Tide patterns for Castries Harbour indicate a high tide at 5:04 p.m., while Vieux Fort Bay will see high tide at 6:11 p.m.
Regional outlook and tropical activity
Across the Lesser Antilles, conditions are expected to be partly cloudy, becoming cloudy at intervals with widely scattered showers. Some of these showers could be locally heavy, especially over the central Windward Islands, where isolated thunderstorms are possible.
Meteorological services also flagged the influence of multiple tropical waves in the wider Atlantic. Moisture and instability trailing a recent tropical wave will continue to fuel showers and thunderstorms across parts of the central Lesser Antilles during the next 24 hours.
In fact, yesterday’s St Lucia weather August 24 2025 report highlighted similar instability, with forecasters warning of moisture trailing tropical waves that continue to affect the region today.
Another tropical wave in the central Atlantic is moving westward at about 12 mph (19 km/h), while a third wave has emerged from the west coast of Africa, tracking west at the same speed.
For continued updates on daily forecasts and tropical weather systems, follow Unitedpac St Lucia News.
