St Lucia climate guide

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
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

Sunshine & Daylight 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

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

More climate for St Lucia

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

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

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

The climate guide for St Lucia, represented by 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.

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