St Lucia weather by month

Check out St Lucia weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum daytime temperature °C
28°C maximum daytime temperature in January in Castries28
28°C maximum daytime temperature in February in Castries28
29°C maximum daytime temperature in March in Castries29
29°C maximum daytime temperature in April in Castries29
30°C maximum daytime temperature in May in Castries30
30°C maximum daytime temperature in June in Castries30
30°C maximum daytime temperature in July in Castries30
30°C maximum daytime temperature in August in Castries30
30°C maximum daytime temperature in September in Castries30
30°C maximum daytime temperature in October in Castries30
29°C maximum daytime temperature in November in Castries29
29°C maximum daytime temperature in December in Castries29
Hours of sunshine (daily)
Days with some rainfall
17 days with some rainfall in January in Castries17
13 days with some rainfall in February in Castries13
13 days with some rainfall in March in Castries13
11 days with some rainfall in April in Castries11
15 days with some rainfall in May in Castries15
19 days with some rainfall in June in Castries19
21 days with some rainfall in July in Castries21
20 days with some rainfall in August in Castries20
25 days with some rainfall in September in Castries25
18 days with some rainfall in October in Castries18
19 days with some rainfall in November in Castries19
18 days with some rainfall in December in Castries18
Sea temperature °C
27°C sea temperature in January in Castries27
26°C sea temperature in February in Castries26
27°C sea temperature in March in Castries27
27°C sea temperature in April in Castries27
28°C sea temperature in May in Castries28
28°C sea temperature in June in Castries28
28°C sea temperature in July in Castries28
29°C sea temperature in August in Castries29
29°C sea temperature in September in Castries29
29°C sea temperature in October in Castries29
28°C sea temperature in November in Castries28
28°C sea temperature in December in Castries28

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St Lucia by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for St Lucia (Castries) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

St Lucia climate overview

St Lucia, one of the Windward Islands, is large and mountainous with volcanic peaks. It attracts more rain than is normal tor the Caribbean.

This falls mainly from May to January and is most intense during the July to November hurricane season when tropical storms can make life difficult even if they don't hit the island directly.

The small beach in Marigot Bay, St Lucia
The small beach in Marigot Bay, St Lucia © Tim Watson - Fotolia.com

The west coast (where Castries is located) is more sheltered from the prevailing winds.

Temperatures on St Lucia are high throughout the year but rarely unbearable since sea breezes help dissipate the humidity, although nights can be sticky.

Tropical storm risk: St Lucia hurricane season

% of month affected by tropical storms
0
0
0
0
0
0
1%
2.4%
3.6%
1.8%
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

What to pack for St Lucia

Light cotton clothing is appropriate, and be prepared for rain at any time of the year.

Top St Lucia destinations

Below are average maximum temperatures at popular countries, regions and places in St Lucia for next month - November. Select a destination to see the climate guide for all months of the year.

All St Lucia destinations

St Lucia weather averages

Temperature in St Lucia (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
28°C maximum daytime temperature in January in St Lucia (Castries)28
28°C maximum daytime temperature in February in St Lucia (Castries)28
29°C maximum daytime temperature in March in St Lucia (Castries)29
29°C maximum daytime temperature in April in St Lucia (Castries)29
30°C maximum daytime temperature in May in St Lucia (Castries)30
30°C maximum daytime temperature in June in St Lucia (Castries)30
30°C maximum daytime temperature in July in St Lucia (Castries)30
30°C maximum daytime temperature in August in St Lucia (Castries)30
30°C maximum daytime temperature in September in St Lucia (Castries)30
30°C maximum daytime temperature in October in St Lucia (Castries)30
29°C maximum daytime temperature in November in St Lucia (Castries)29
29°C maximum daytime temperature in December in St Lucia (Castries)29
Min temperature (night-time)
22°C minimum night-time temperature in January in St Lucia (Castries)22
22°C minimum night-time temperature in February in St Lucia (Castries)22
22°C minimum night-time temperature in March in St Lucia (Castries)22
23°C minimum night-time temperature in April in St Lucia (Castries)23
24°C minimum night-time temperature in May in St Lucia (Castries)24
24°C minimum night-time temperature in June in St Lucia (Castries)24
25°C minimum night-time temperature in July in St Lucia (Castries)25
24°C minimum night-time temperature in August in St Lucia (Castries)24
24°C minimum night-time temperature in September in St Lucia (Castries)24
24°C minimum night-time temperature in October in St Lucia (Castries)24
23°C minimum night-time temperature in November in St Lucia (Castries)23
23°C minimum night-time temperature in December in St Lucia (Castries)23
Heat & Humidity
Moderate heat & humidity in January in St Lucia (Castries)M
Moderate heat & humidity in February in St Lucia (Castries)M
Moderate heat & humidity in March in St Lucia (Castries)M
High heat & humidity in April in St Lucia (Castries)H
High heat & humidity in May in St Lucia (Castries)H
High heat & humidity in June in St Lucia (Castries)H
High heat & humidity in July in St Lucia (Castries)H
Very high heat & humidity in August in St Lucia (Castries)VH
Very high heat & humidity in September in St Lucia (Castries)VH
High heat & humidity in October in St Lucia (Castries)H
High heat & humidity in November in St Lucia (Castries)H
Moderate heat & humidity in December in St Lucia (Castries)M
Sea temperature
27°C sea temperature in January in St Lucia (Castries)27
26°C sea temperature in February in St Lucia (Castries)26
27°C sea temperature in March in St Lucia (Castries)27
27°C sea temperature in April in St Lucia (Castries)27
28°C sea temperature in May in St Lucia (Castries)28
28°C sea temperature in June in St Lucia (Castries)28
28°C sea temperature in July in St Lucia (Castries)28
29°C sea temperature in August in St Lucia (Castries)29
29°C sea temperature in September in St Lucia (Castries)29
29°C sea temperature in October in St Lucia (Castries)29
28°C sea temperature in November in St Lucia (Castries)28
28°C sea temperature in December in St Lucia (Castries)28

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in St Lucia

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
11 hours of daylight per day in January in St Lucia (Castries)11
12 hours of daylight per day in February in St Lucia (Castries)12
12 hours of daylight per day in March in St Lucia (Castries)12
12 hours of daylight per day in April in St Lucia (Castries)12
13 hours of daylight per day in May in St Lucia (Castries)13
13 hours of daylight per day in June in St Lucia (Castries)13
13 hours of daylight per day in July in St Lucia (Castries)13
13 hours of daylight per day in August in St Lucia (Castries)13
12 hours of daylight per day in September in St Lucia (Castries)12
12 hours of daylight per day in October in St Lucia (Castries)12
11 hours of daylight per day in November in St Lucia (Castries)11
11 hours of daylight per day in December in St Lucia (Castries)11
UV Index (Maximum)
UV (maximum) index 9 (Very High) in January in St Lucia (Castries)9
UV (maximum) index 11 (Extreme) in February in St Lucia (Castries)11
UV (maximum) index 11+ (Extreme) in March in St Lucia (Castries)11
UV (maximum) index 11+ (Extreme) in April in St Lucia (Castries)11
UV (maximum) index 11+ (Extreme) in May in St Lucia (Castries)11
UV (maximum) index 11+ (Extreme) in June in St Lucia (Castries)11
UV (maximum) index 11+ (Extreme) in July in St Lucia (Castries)11
UV (maximum) index 11+ (Extreme) in August in St Lucia (Castries)11
UV (maximum) index 11+ (Extreme) in September in St Lucia (Castries)11
UV (maximum) index 11 (Extreme) in October in St Lucia (Castries)11
UV (maximum) index 9 (Very High) in November in St Lucia (Castries)9
UV (maximum) index 8 (Very High) in December in St Lucia (Castries)8

Rainfall in St Lucia

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
17 days with some rainfall in January in St Lucia (Castries)17
13 days with some rainfall in February in St Lucia (Castries)13
13 days with some rainfall in March in St Lucia (Castries)13
11 days with some rainfall in April in St Lucia (Castries)11
15 days with some rainfall in May in St Lucia (Castries)15
19 days with some rainfall in June in St Lucia (Castries)19
21 days with some rainfall in July in St Lucia (Castries)21
20 days with some rainfall in August in St Lucia (Castries)20
25 days with some rainfall in September in St Lucia (Castries)25
18 days with some rainfall in October in St Lucia (Castries)18
19 days with some rainfall in November in St Lucia (Castries)19
18 days with some rainfall in December in St Lucia (Castries)18
Average monthly rainfall (mm)
113 mm monthly rainfall in January in St Lucia (Castries)113
86 mm monthly rainfall in February in St Lucia (Castries)86
76 mm monthly rainfall in March in St Lucia (Castries)76
96 mm monthly rainfall in April in St Lucia (Castries)96
124 mm monthly rainfall in May in St Lucia (Castries)124
182 mm monthly rainfall in June in St Lucia (Castries)182
245 mm monthly rainfall in July in St Lucia (Castries)245
216 mm monthly rainfall in August in St Lucia (Castries)216
224 mm monthly rainfall in September in St Lucia (Castries)224
269 mm monthly rainfall in October in St Lucia (Castries)269
255 mm monthly rainfall in November in St Lucia (Castries)255
149 mm monthly rainfall in December in St Lucia (Castries)149

Tropical storm risk: St Lucia hurricane season

% of month affected by tropical storms
0
0
0
0
0
0
1%
2.4%
3.6%
1.8%
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Compare St Lucia weather with the UK

The weather chart below compares the average monthly maximum daytime temperature for St Lucia (Castries) and the UK (London).

Maximum daytime temperature (°C)

St Lucia (Castries)
UK (London)
28
7
28
7
29
10
29
13
30
17
30
20
30
22
30
22
30
19
30
15
29
10
29
8
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C / mm)  |  Imperial (°F / inches)

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