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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.
Re: How is the weather in St. Lucia in July and August. Jun 27, 2011, 11:47 PM. My husband and I were in St. Lucia last year in the last week of August. At that time, we had a little rain (as in, it rained for like 15min a couple of days).