St. Lucia average temperatures. © Scott S. Bateman

St. Lucia’s monthly weather is luxurious most of the year, but anyone planning a vacation there will find that some months are better than others.

St. Lucia is in the middle of the pack in popularity among Caribbean destinations, according to rankings from the Caribbean Tourism Organization.

It attracts similar numbers of both cruise and hotel visitors because of its beautiful green hills and white sand beaches.

St. Lucia Monthly Temperatures

The island’s climate is typical for eastern Caribbean weather.

St. Lucia’s monthly temperatures range between the mid-80s and upper 80s Fahrenheit during the day throughout the year, according to historical records from the St. Lucia Meteorological Services. The average low temperatures hover around the mid-70s. They usually take place at night.

Daytime temperatures on average reach their highest point in the upper 80s Fahrenheit and low 30s Celsius from May through October. But September and October also have a high risk of rain.

Average daytime temperatures hit a low point of 84 degrees Fahrenheit or 29 degrees Celsius in January and February. St. Lucia’s winter temperatures make it one of the warmer Caribbean islands.

Keep in mind that these temperatures are historical averages. The actual temperature on any day, week or month may vary somewhat.

Average Monthly Rainfall

St. Lucia monthly rainfall. © Scott S. Bateman

It’s the rainfall that impacts the popularity of each month with visitors.

The island receives about 50 inches of rain each year, with the lowest months being in the spring and the heaviest in the fall.

St. Lucia weather in February through May is part of a regular dry season when rainfall averages about two to three inches a month. It makes this time of the year popular with cruise and hotel visitors wanting to escape the cold northern winters.

The island has a rainy season from June until December. Average monthly rainfall starts moderately in June and increases each month until it reaches a high point in September and October.

St. Lucia travel hits a low point in September and October during the worst part of the Caribbean’s annual hurricane season. Rainfall averages about eight inches each month historically, according to the St. Lucia Meteorological Services.

July, August and November average six inches of rain or more.

The number of days with rain each month varies as well from a low of 12 in April to a high of at least 20 days from July through November.

As a result of the rain, St. Lucia usually sees the largest number of vacationers from December through May, a moderate number in the summer and a sharp decrease in September and October.

Anyone planning to travel to the island will increase their chances of good weather by going in the first half of the year. They should avoid early fall if at all possible.

- St. Lucia weather in
January | February | March | April | May | June | July | August | September | October | November | December