St Kitts and Nevis Meteorological Forecast

This detailed weather forecast pertains to the Leeward Islands and is valid from September 15, 2025, until 8 pm on Tuesday, September 16, 2025. The forecast highlights a transition in weather conditions, primarily driven by the movement of atmospheric troughs and their associated moisture and instability. Initially, these factors are expected to diminish during the night of September 15th, leading to a decrease in shower activity. However, a new trough approaching the area later on September 16th will reintroduce the potential for showers, particularly in the late afternoon. The forecast also details temperature ranges, wind patterns, sea conditions, and sunrise/sunset times.

The temperature forecast for September 16th predicts a high of 33°C (91°F) and a low of 26°C (79°F), indicating a relatively warm day typical of a tropical climate. The synopsis emphasizes the dynamic interaction of weather systems, with the initial trough weakening and reducing the chance of showers before another trough arrives to increase precipitation potential again. This interplay of atmospheric systems creates a fluctuating forecast with varying shower probabilities throughout the forecast period.

The weather forecast for the night of September 15th anticipates decreasing cloud cover. Despite the lessening clouds, there remains a moderate 60% chance of showers during the evening, along with a slight 20% chance of thunderstorms. This suggests that while the overall cloud cover decreases, enough atmospheric instability remains to support some shower activity. The forecast also indicates that this chance of shower activity is concentrated in this evening.

Looking ahead to September 16th, the daytime forecast predicts partly cloudy conditions. This suggests a mix of sunshine and cloud cover during the morning hours with a 40% or moderate chance of morning showers. It is worth noting that there is an increased chance of afternoon showers, rising from 40% in the morning to 60% by the late afternoon. This elevated chance of afternoon precipitation is directly linked to the arrival of the second trough mentioned in the synopsis.

The wind forecast anticipates easterly winds blowing at speeds between 17 to 30 km/h (10 to 18 mph). These winds are expected to experience lighter spells overnight before shifting to an east-northeasterly direction by tomorrow afternoon. These moderate winds are further classified with lighter spells during the night. The change in wind direction suggests a shift in the prevailing wind patterns, likely associated with the approaching weather system.

Sea conditions are predicted to be relatively calm, with wave heights of approximately 1.5 meters or 5 feet. This suggests generally favorable conditions for maritime activities. Finally, the forecast provides sunrise and sunset times for September 16th. Sunrise is expected at 5:59 am, while sunset will occur at 6:13 pm, providing roughly 12 hours and 14 minutes of daylight. These sunrise and sunset timings are typical for this time of year in the Northern Hemisphere. This comprehensive forecast provides valuable information for residents and visitors of the Leeward Islands, allowing them to plan their activities accordingly and prepare for the changing weather conditions.