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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.
I'm traveling to St. Lucia in November for my wedding and honeymoon. I would be happy to let you know how the weather is when I return and anything else you might want to know. We went to St. Lucia during the second week of December last year and had beautiful weather. It was in the mid-80s everyday, generally with a nice breeze and plenty of sunshine. Every afternoon, we had an extremely brief (like 5-10 minute) light shower.