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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 lowdown. The weather continues to get cooler in St Lucia in December. During this month, the average temperature starts off at 27.5Â°C (created by highs of 30Â°C and lows of 25Â°C) on December 1 st and falls down to 27Â°C (highs of 29Â°C and lows of 25Â°C) gradually by December 31 st.he average sea temperature for St Lucia stays pleasantly warm throughout the year. In December, itâs 28Â°C â thatâs the same as last month â which is certainly warm enough for a swim. Thanks to its tropical climate, St Lucia remains humid all-year-round.