Measurements:
°C
°F
CURRENT WEATHER
16:54
Castries
86°F
W 17 mph
Feels like: 94°F
Precip: 65%
World Resorts Saint Lucia Castries Weather

7 Day Weather Forecast

09.08
tue
DAY
90°F
W 18 mph
precip
18%
NIGHT
86°F
W 20 mph
precip
29%
09.09
wed
DAY
90°F
W 18 mph
precip
19%
NIGHT
86°F
W 17 mph
precip
23%
09.10
thu
DAY
88°F
W 17 mph
precip
46%
NIGHT
84°F
W 19 mph
precip
35%
09.11
fri
DAY
88°F
W 19 mph
precip
8%
NIGHT
84°F
W 19 mph
precip
23%
09.12
sat
DAY
88°F
W 16 mph
precip
38%
NIGHT
84°F
W 14 mph
precip
15%
09.13
sun
DAY
88°F
W 16 mph
precip
22%
NIGHT
84°F
W 15 mph
precip
19%
09.14
mon
DAY
88°F
W 16 mph
precip
47%
NIGHT
84°F
W 16 mph
precip
56%

Castries Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Castries was 29.7°F. The maximum and minimum values were 29.4°F and 29.9°F respectively.

Castries on the Weather Map

Best Time to Visit Castries
The most sunny months:
December 4 days
March 4 days
September 4 days
The most warm months:
September 90.9 °F
October 90.0 °F
August 89.7 °F
Warmest sea temperature:
September 88.7 °F
October 88.4 °F
August 87.7 °F
The most cold months:
January 85.3 °F
February 85.4 °F
March 85.7 °F
The most rainy months:
August 7 days
October 5 days
September 5 days
The most windy months:
June 16 mph
February 15 mph
July 15 mph
more details