St Kitts and Nevis Meteorological Forecast

This detailed weather forecast pertains to the Leeward and British Virgin Islands, valid until 8 PM on Friday, September 19, 2025. The forecast period encompasses the remainder of Wednesday, September 18th, and the entirety of Thursday, September 19th. The overarching weather pattern is characterized by lingering moisture and atmospheric instability, which will contribute to periods of cloudiness and showers throughout the region. Temperatures will be relatively warm, reaching a high of 32°C (90°F) and dropping to a low of 25°C (77°F). This suggests a typical tropical climate with a moderate diurnal temperature range.

For Wednesday night, the forecast predicts partly cloudy to cloudy skies with intermittent showers. The probability of thunderstorms is moderate, estimated at 40%. This indicates a reasonable likelihood of thunderstorm activity during the overnight hours. This combination of cloud cover, showers, and potential thunderstorms suggests a somewhat unsettled and potentially wet night across the islands. Residents and visitors should be prepared for rainfall and potential thunder and lightning.

Looking ahead to Thursday, the forecast calls for partly cloudy skies with showers, and a slight chance of thunderstorms in the afternoon, estimated at 20%. This suggests a lower probability of thunderstorm activity compared to the previous night. While showers are still expected, the overall weather picture for Thursday appears slightly less volatile. The reduced chance of thunderstorms implies a generally drier day, although intermittent showers are still likely.

The wind forecast indicates east-southeast winds ranging from 9 to 19 km/h (6 to 12 mph) with lighter periods overnight. These are relatively gentle winds, typical of a tropical environment. The east-southeast direction suggests a flow of air from the Atlantic Ocean, likely contributing to the moisture and instability mentioned earlier. The lighter winds overnight might lead to somewhat calmer conditions compared to the daytime hours.

Sea conditions are expected to be relatively moderate, with wave heights between 0.9 and 1.5 meters (3 to 5 feet). Easterly swells of up to 1.5 meters (5 feet) are also anticipated. These sea conditions appear generally favorable for maritime activities, although small craft operators and those sensitive to sea sickness should be mindful of the swells. The easterly direction of the swells aligns with the wind direction, suggesting a consistent pattern of atmospheric and oceanic movement.

Finally, the forecast provides sunrise and sunset times for Thursday, September 19th: sunrise at 5:59 AM and sunset at 6:10 PM. This information provides a useful reference for planning outdoor activities and appreciating the natural cycle of day and night. The roughly 12-hour period of daylight is typical for this time of year in the tropics, reflecting the position of the sun relative to the Earth.

In summary, this weather forecast paints a picture of relatively typical late-summer conditions for the Leewards and British Virgin Islands. Lingering moisture and instability are contributing to periods of cloudiness and showers, with a moderate chance of thunderstorms on Wednesday night and a slight chance on Thursday afternoon. Temperatures will be warm, winds will be generally light, and sea conditions moderate. While rainfall is anticipated, the forecast does not suggest any severe weather events. Residents and visitors are advised to stay informed of any updates to the forecast and to take appropriate precautions in case of showers or thunderstorms. Overall, the weather appears conducive to various outdoor activities, with some consideration given to the possibility of intermittent rainfall. The moderate sea conditions should also allow for maritime activities with appropriate caution.