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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.
Weather on St. Lucia. From warm sunshine to mild trade winds, the weather on St. Lucia is sure to please. Photo credit: Â©Dean Perrus | Dreamstime.com. As is the case with many Caribbean islands, St. Lucia's visitors should expect hot and humid weather conditions year round due to the island's proximity to the equator. Fortunately, visitors will rarely feel uncomfortable as mild trade winds bring cool breezes off the water that offer some respite from the heat.