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Re: February weather St. Lucia Jul 28, 2009, 10:53 PM February is definitely a good time to go to St. Lucia,as you typically have low amount of rainfall during that month. The average temperature should be about 80-85 degrees. If it happens to rain, then you usually get 10 minute showers during the day and after that the sun comes out again.
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.