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St Lucia weather

Dry season (December-June)

The dry season is the busiest time of the year for St Lucia and is usually when flight and accommodation prices will be at their highest and resorts will be at their most packed. At this time of year, average daytime highs fluctuate between 31°C and 29°C, whilst average night time lows range between 23°C and 25°C. Temperatures drop between December and January and then begin to rise from February onward as the season progresses.

The highest temperature ever recorded in St Lucia during the dry season is 37°C, which happened in May, whilst the lowest temperature ever registered in St Lucia during the dry season is 16°C, which occurred in December, January and April.

With an average of 140mm/6 inches of rainfall spread out between 20 rainy days, June is usually the wettest month in the dry season. On the other hand, with only 21mm/1 inch of rainfall divided between 16 rainy days, April is usually the driest month of the wet season. Between December and April, the precipitation drops, but from May onward, it increases as the wet season nears.

The start dry season is usually the least cloudy time of the year, which makes it a great season for sunbathing. Median cloud cover starts at around 57% in December, falling to 53% by January and then gradually rising until it peaks at 75% in April, when the sky is more overcast than it is clear. The median cloud cover then continues to fall until it reaches 68% by June.

Wet season (July-November)

Because of the unfavourable weather conditions, the wet season is the least popular time to visit St Lucia, which means you’ll be able to snap up some fantastic deals, if you don’t mind a bit of bad weather. During this season, average daytime highs range between 31°C and 32°C, whilst average night lows range between 24°C and 25°C.

The hottest temperature ever registered in St Lucia in the wet season is 39°C which occurred in November, whilst the coldest temperature ever recorded on the island during the wet season is 20°C, which happened in September and November.

With an average of 237mm/9 inches of rainfall divided between 20 rainy days, October is the wettest month of the wet season and the whole year. At the other end of the scale, with only 167mm/7 inches of rainfall divided between 20 rainy days, November is the driest season of the month. Precipitation increases between July and October then begins to decrease from November onward, as the dry season edges closer.

The median cloud cover for St Lucia decreases as the wet season progresses. Median cloud cover starts off at 65% in July and rises up to 70% by September/October, before falling down to 61% by November.

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