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The average day light hours per day in St Lucia in February are 11.7 and there are 4.7 hours of sunshine per day on average during February making it a sunny month that is overcast at times. The ultraviolet index in St Lucia in February is typically 11.6 during February.
When to Visit St. Lucia. The best time to visit St. Lucia is between May and June. These late-spring months offer wonderful weather temperatures â high 70s to 80s â plus there are enviable room rates at the best hotels. Music lovers should consider visiting in early May specifically to attend the St. Lucia Jazz & Arts Festival that's held on Pigeon Island National Park. The island is flush with activity in the summer and late fall, but there's a greater chance of hurricanes.