St. Kitts and Nevis Meteorological Forecast

The meteorological forecast for September 17, 2025, predicts persistent shower and thunderstorm activity across the islands, driven by a combination of atmospheric factors. A tropical wave, carrying ample moisture and instability, is interacting with conducive upper-level conditions, creating a fertile environment for convective weather development. This synergistic effect between the tropical wave and the upper-level atmospheric dynamics sets the stage for periods of rainfall and potentially vigorous thunderstorm activity throughout the next 24 hours.

The forecast for the night of September 17, 2025, indicates partly cloudy skies with a moderate chance of showers, estimated at 60%, and a slight chance of thunderstorms, around 20%. This suggests a relatively active weather pattern overnight, albeit with a greater emphasis on shower activity rather than intense thunderstorm development. The cloud cover will be partial, allowing for intermittent glimpses of the night sky between periods of precipitation.

The forecast for September 18, 2025, predicts a continuation of the unstable atmospheric conditions, resulting in an increased likelihood of showers and thunderstorms. The probability of showers rises to 70%, categorized as a high chance, while the chance of thunderstorms increases to 40%, considered a moderate chance. This suggests a higher likelihood of more intense convective activity compared to the previous night, with a greater potential for heavier downpours and lightning activity accompanying the rainfall.

Wind conditions are expected to remain relatively light and variable. Predominantly easterly winds are anticipated, ranging in speed from 6 to 24 kilometers per hour (3 to 15 miles per hour). However, these winds are expected to become variable or even calm at times, indicating a lack of a dominant wind direction and a generally less turbulent lower atmosphere. This suggests that wind speeds will not be a significant contributing factor to the overall weather conditions during the forecast period.

Sea conditions are predicted to be relatively calm, with wave heights expected to range between 1 and 1.5 meters (3 to 5 feet). This indicates generally favorable conditions for maritime activities, with limited wave action and no significant swell predicted. The calm sea state reflects the absence of strong winds or other significant weather systems that could generate larger waves.

Sunrise on September 18, 2025, is projected to occur at 5:59 am, while sunset is expected at 6:11 pm. This indicates a daylight period lasting approximately 12 hours and 12 minutes, reflecting the time of year and the position of the sun relative to the Earth. The timing of sunrise and sunset provides a valuable reference point for planning outdoor activities and understanding the daily cycle of light and darkness. The relatively equal length of day and night suggests that the islands are approaching the equinox, a period of the year characterized by approximately equal durations of daylight and darkness across the globe.