Marigot Bay

Castries Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Castries, Saint Lucia in September.

Thinking about venturing to Castries, Saint Lucia this September and curious about the weather conditions to expect? This page holds all the key information you seek, responding to your question:

What to Expect in Castries in September

Castries, Saint Lucia is a region in Saint Lucia. September in Castries generally has very warm temperatures, with high precipitation.

Temperatures

You can expect very warm maximum daytime temperatures of around 31°C (88°F) and nighttime temperatures around 26°C (79°F) in Soufrière. The temperatures cited for both day and night represent usual averages, but it's possible some days could be hotter. It's advisable to dress accordingly to handle the heat.

To learn more about the conditions in specific areas of Castries, Saint Lucia, check out the map below.

Precipitation

In September, precipitation varies across different areas. From high rainfall in Castries with an average of 122 mm (4.8 in) to high rainfall in Mon Repos with 147 mm (5.8 in).

Average sunshine

Sunshine is generally plentiful throughout many areas. Soufrière enjoys about 238 hours of sunlight, ideal for those seeking sunny weather.

Explore Castries by month

Pick a month to see the average temperature, rainfall and sunshine in Castries - and find the best time to visit. (based on Soufrière)

Best Places to Visit in Castries in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Castries.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Castries

What is the weather like in September for some of the most popular destinations in Castries, Saint Lucia?

Temperature range in Castries (September)

Precipitation variation in Castries (September)

Soufrière

In September Soufrière generally has very high temperatures with maximum daytime temperatures around 31°C (88°F), minimum nighttime temperatures around 26°C (79°F) and high monthly rainfall. So on average the conditions are good that month.

August
September
October
Max temperature
31°C (88°F)
31°C (88°F)
30°C (86°F)
Min temperature
26°C (79°F)
26°C (79°F)
26°C (79°F)
Monthly sun hours
248 hours
238 hours
214 hours
Monthly rainfall
121 mm (4.8 in)
128 mm (5 in)
137 mm (5.4 in)
Monthly rainy days
20 days
24 days
18 days
Weather conditions

Castries

In September Castries generally has very high temperatures with maximum daytime temperatures around 31°C (88°F), minimum nighttime temperatures around 26°C (79°F) and high monthly rainfall. So on average the conditions are good that month.

August
September
October
Max temperature
31°C (88°F)
31°C (88°F)
31°C (88°F)
Min temperature
26°C (79°F)
26°C (79°F)
26°C (79°F)
Monthly sun hours
248 hours
238 hours
214 hours
Monthly rainfall
114 mm (4.5 in)
122 mm (4.8 in)
133 mm (5.2 in)
Monthly rainy days
20 days
24 days
18 days
Weather conditions

Marigot Bay

In September Marigot Bay generally has very high temperatures with maximum daytime temperatures around 31°C (88°F), minimum nighttime temperatures around 26°C (79°F) and high monthly rainfall. So on average the conditions are good that month.

August
September
October
Max temperature
31°C (88°F)
31°C (88°F)
31°C (88°F)
Min temperature
26°C (79°F)
26°C (79°F)
26°C (79°F)
Monthly sun hours
248 hours
238 hours
214 hours
Monthly rainfall
117 mm (4.6 in)
124 mm (4.9 in)
134 mm (5.3 in)
Monthly rainy days
20 days
24 days
18 days
Weather conditions

Mon Repos

In September Mon Repos generally has very high temperatures with maximum daytime temperatures around 30°C (86°F), minimum nighttime temperatures around 26°C (79°F) and high monthly rainfall. So on average the conditions are good that month.

August
September
October
Max temperature
30°C (86°F)
30°C (86°F)
30°C (86°F)
Min temperature
26°C (79°F)
26°C (79°F)
26°C (79°F)
Monthly sun hours
248 hours
238 hours
214 hours
Monthly rainfall
142 mm (5.6 in)
147 mm (5.8 in)
157 mm (6.2 in)
Monthly rainy days
20 days
23 days
18 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Castries, in Saint Lucia.

Popular cities in September

Day & night temperatures, rainfall and average weather in Castries in September.

City Weather Day temp Night temp Rainfall
Soufrière 31°C (88°F) 26°C (79°F) 128 mm (5 in)
Castries 31°C (88°F) 26°C (79°F) 122 mm (4.8 in)
Marigot Bay 31°C (88°F) 26°C (79°F) 124 mm (4.9 in)
Mon Repos 30°C (86°F) 26°C (79°F) 147 mm (5.8 in)

Castries weather in September: frequently asked questions

What is the weather like in Castries, Saint Lucia in September?

In September, Castries, Saint Lucia generally has mixed weather conditions. Soufrière sees daytime temperatures near 31°C (88°F), with nights cooling to roughly 26°C (79°F).

What is the average temperature in Castries, Saint Lucia in September?

Daytime temperatures in Soufrière peak at roughly 31°C (88°F) in September, dropping to about 26°C (79°F) overnight.

Does Castries, Saint Lucia get a lot of rain in September?

Soufrière typically receives notable rainfall in September, about 128 mm (5 in) on average across Castries, Saint Lucia.

Is September a Good Time to Visit Castries, Saint Lucia?

Given the typically good weather conditions in Soufrière, September may not be the ideal time to visit Castries, Saint Lucia.

Generally speaking, January, February, March and December provide excellent weather in Soufrière. In contrast, July, August, September, October and November tend to have mixed weather conditions.

Interested in more climate information?

We have much more information about the climate in Castries.

Weather and climate has detailed information for every country in the world. Are you going to Saint Lucia? Get detailed historical weather averages for many cities in Saint Lucia.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.