Castries weather live forecast

Today's maximum temperature in Castries is expected to be 31°C. Select a day from the live weather forecast for Castries, St Lucia for more weather parameters.

Monday
17th Aug
31

27

5

11
Tuesday
18th Aug
31

27

7

11
Wednesday
19th Aug
32

28

7

11
Thursday
20th Aug
31

28

7

10
Friday
21st Aug
31

28

5

11

5-day weather forecast updated at 04:00 on Monday 17th August 2026 GMT

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The 5-day weather forecast for St Lucia (Castries) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Castries weather forecast by day

Below are the detailed weather forecasts for Castries for the next 5 days.

Castries weather for Monday 17th August 2026

Expect isolated thunderstorms in Castries, St Lucia with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 91% chance of some rain and a gentle breeze of 16 kph from the east.

31
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
11
UV index (Extreme)
91
% chance of some rain
<10
mm of rainfall expected
M
moderate heat & humidity
16
kph wind from E

Castries weather for Tuesday 18th August 2026

Expect isolated thunderstorms in Castries, St Lucia with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 11 (Extreme) and 7 hours of bright sunshine. There are 10-20 mm of rainfall expected with 59% chance of some rain and a light breeze of 9 kph from the east.

31
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
11
UV index (Extreme)
59
% chance of some rain
<20
mm of rainfall expected
M
moderate heat & humidity
9
kph wind from E

Castries weather for Wednesday 19th August 2026

Expect isolated thunderstorms in Castries, St Lucia with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 47% chance of some rain and a gentle breeze of 16 kph from the east.

32
°C maximum temperature
28
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
11
UV index (Extreme)
47
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
16
kph wind from E

Castries weather for Thursday 20th August 2026

Expect isolated thunderstorms in Castries, St Lucia with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 34% chance of some rain and a moderate breeze of 21 kph from the east.

31
°C maximum temperature
28
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
10
UV index (Very High)
34
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
21
kph wind from E

Castries weather for Friday 21st August 2026

Expect isolated thunderstorms in Castries, St Lucia with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 74% chance of some rain and a gentle breeze of 18 kph from the east.