AI-generatedSaint Lucia (Castries) at a glance
- Best time
- Dec – Jul
- Warmest month
- Sep · 29°
- Warmest sea
- Sep · 29.3°
- Sunshine a year
- 3,050 h
- Rain a year
- 807 mm
- Climate
- Tropical
- Time zone
- UTC−4
- Elevation
- 119 m
Climate in Saint Lucia (Castries)
Saint Lucia (Castries) has a tropical climate: it is warm all year round, and the seasons differ mainly in how much rain falls. September is the warmest month with average highs of 29 °C, while January is the coolest at 27 °C. With around 3,050 hours of sunshine a year, Saint Lucia (Castries) is very sunny; April is the sunniest month with 8.9 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Good
Best time to visit: December – July
October is the peak of the hurricane season
Keep in mindFrequent rainStorm season
A typical day in October
- Morning, 08:00: about 27°
- Midday, 13:00: about 29°
- Afternoon, 16:00: about 28°
- Evening, 20:00: about 27°
- Night, 23:00: about 26°
05:5417:45
Warm enough for a T-shirt in the evening.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 05:41–06:23 · evening 17:16–17:58
- Blue hour
- Morning 05:33–05:41 · evening 17:58–18:06
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Saint Lucia (Castries) in October?
In October, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 29.2 °C – almost as warm as a bath. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 22 days, totalling 124 mm. The air is often humid and muggy. All in all, October is a good month for a holiday in Saint Lucia (Castries).
More details for October
- Daylight
- 11 h 50 min05:54 – 17:45
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 62 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Time zone
- UTC−4America/St_Lucia
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %82 %
- Few rainy daysweight 20 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Sea temperature in Saint Lucia (Castries)
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 28.6 – 29.7 °C
Swimming season: All year
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Saint Lucia (Castries) ranges from 26.9 °C in February to 29.3 °C in September. At 20 °C and more, the sea is warm enough for swimming all year round.
From October to January the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in September, eight out of ten years were between 28.7 and 29.8 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 27.2° | 26.9° | 27.6° | warm |
| FebruaryFeb | 26.9° | 26.4° | 27.3° | warm |
| MarchMar | 26.9° | 26.4° | 27.5° | warm |
| AprilApr | 27.3° | 26.8° | 27.7° | warm |
| MayMay | 27.8° | 27.3° | 28.4° | warm |
| JuneJun | 28.0° | 27.5° | 28.5° | warm |
| JulyJul | 28.2° | 27.6° | 28.8° | warm |
| AugustAug | 28.8° | 28.3° | 29.4° | warm |
| SeptemberSep | 29.3° | 28.7° | 29.8° | very warm |
| OctoberOct | 29.2° | 28.6° | 29.7° | very warm |
| NovemberNov | 28.6° | 28.2° | 29.0° | warm |
| DecemberDec | 27.9° | 27.4° | 28.2° | warm |
Sunshine hours in Saint Lucia (Castries)
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 7.9 of 11.8 hours of daylight in Saint Lucia (Castries), 67 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Saint Lucia (Castries)
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 11 · extremeAvoid the midday sun; SPF 50+, covering clothes, hat and sunglasses.
The sun is strongest in August (UV 13).
Minutes until sunburn in October
- Very fair skin
- about 10 min
- Fair skin
- about 15 min
- Light brown skin
- about 20 min
- Olive skin
- about 30 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Saint Lucia (Castries): rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Saint Lucia (Castries) has about 22 rainy days with 124 mm of rain in total.
Wind and clouds in Saint Lucia (Castries)
How breezy and how cloudy Saint Lucia (Castries) is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Saint Lucia (Castries) typically peaks at 21 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting: Oct – Aug.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 62 % of the sky over Saint Lucia (Castries): variable cloud, with about 7.9 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Saint Lucia (Castries)
How often the day gets hot in Saint Lucia (Castries) (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Saint Lucia (Castries) has about 3 hot days, with an average daytime high of 29 °C: often muggy. The air feels warmer than the thermometer says: light, airy clothes and slow days help.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Saint Lucia (Castries)
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Warm 20–24°
- Hot 24° and more
- muggy month (10+ muggy days)
HotOctober: nights around 25°. Hot nights: air conditioning makes sleeping much easier. Muggy on about 31 days (dew point 18 °C or more).
The coolest nights are in February (23°), the warmest in September (25°). Nights stay tropical all year (20 °C and more), so a room with air conditioning or at least a fan pays off. It is muggy (dew point 18 °C or more) on about 355 days a year, mostly all year round.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 85 | 27° | 24° | 27.2° | 8.5 h | 13 | 34 |
| FebruaryFeb | 91 | 27° | 23° | 26.9° | 8.7 h | 10 | 24 |
| MarchMar | 90 | 28° | 24° | 26.9° | 8.8 h | 10 | 27 |
| AprilApr | 88 | 29° | 24° | 27.3° | 8.9 h | 12 | 39 |
| MayMay | 86 | 29° | 25° | 27.8° | 8.7 h | 13 | 45 |
| JuneJun | 79 | 29° | 25° | 28.0° | 7.8 h | 16 | 71 |
| JulyJul | 79 | 29° | 25° | 28.2° | 8.6 h | 21 | 91 |
| AugustAug | 79 | 29° | 25° | 28.8° | 8.7 h | 22 | 105 |
| SeptemberSep | 76 | 29° | 25° | 29.3° | 7.7 h | 20 | 102 |
| OctoberOct | 76 | 29° | 25° | 29.2° | 7.9 h | 22 | 124 |
| NovemberNov | 76 | 28° | 25° | 28.6° | 7.8 h | 19 | 103 |
| DecemberDec | 84 | 28° | 24° | 27.9° | 8.2 h | 13 | 43 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
14.00° N, 61.01° W · 119 m · America/St_Lucia
Best time to visit Saint Lucia (Castries)
The best time to visit Saint Lucia (Castries) is from December to July. For a beach holiday with the sea above 21 °C, go from February to April. For sightseeing, day trips and hiking, conditions are most comfortable from February to March. Rain is most frequent from May to January; the wettest month is October with 124 mm.
Saint Lucia (Castries) through the seasons
How the weather changes over the seasons, with averages for each.
Saint Lucia (Castries) in the dry season
Feb – Apr
Excellent
- 27–29 °C by day
- Sea 27 °C
- 9 h of sun a day
- 32 rainy days in all
Saint Lucia (Castries) in the rainy season
May – Jan
Excellent
- 27–29 °C by day
- Sea 28 °C
- 8 h of sun a day
- 158 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Saint Lucia (Castries) for you.
Your best months: February – April
Based on the climate averages; tap a month to see its details.
Compare two months in Saint Lucia (Castries)
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
February has the better holiday weather in Saint Lucia (Castries): score 91 against 76. In February, days are 2 °C cooler than in October. The sea is 2 °C cooler in February. February has 12 fewer rainy days. The sun shines an hour longer a day in February.
| Month | October | February |
|---|---|---|
| Weather score | 76 | 91better |
| Day high | 29° | 27° |
| Night low | 25° | 23° |
| Sea | 29.2° | 26.9° |
| Sunshine | 7.9 h | 8.7 hbetter |
| Rainy days | 22 | 10better |
| Rainfall | 124 mm | 24 mmbetter |
| Muggy days | 31 | 25better |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Feb – Apr
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Feb – Mar
15–28 °C and not too much rain
Rainy months
May – Jan
12 or more rainy days
Saint Lucia (Castries) month by month
The typical weather for every month at a glance.
85January27° · Sea 27° · 9 h
In January, Saint Lucia (Castries) is hot: daytime highs average 27 °C, and even at night it stays warm at around 24 °C. The sea averages 27.2 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is frequent, with about 13 rainy days and 34 mm in total. The air is often humid and muggy. All in all, January is an excellent month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in January91February27° · Sea 27° · 9 h
In February, Saint Lucia (Castries) is hot: daytime highs average 27 °C, and even at night it stays warm at around 23 °C. The sea averages 26.9 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is frequent, with about 10 rainy days and 24 mm in total. The air is often humid and muggy. All in all, February is an excellent month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in February90March28° · Sea 27° · 9 h
In March, Saint Lucia (Castries) is hot: daytime highs average 28 °C, and even at night it stays warm at around 24 °C. The sea averages 26.9 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is frequent, with about 10 rainy days and 27 mm in total. The air is often humid and muggy. All in all, March is an excellent month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in March88April29° · Sea 27° · 9 h
In April, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 24 °C. The sea averages 27.3 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is frequent, with about 12 rainy days and 39 mm in total. The air is often humid and muggy. All in all, April is an excellent month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in April86May29° · Sea 28° · 9 h
In May, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 27.8 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is frequent, with about 13 rainy days and 45 mm in total. The air is often humid and muggy. All in all, May is an excellent month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in May79June29° · Sea 28° · 8 h
In June, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 28.0 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 16 days, totalling 71 mm. The air is often humid and muggy. All in all, June is a good month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in June79July29° · Sea 28° · 9 h
In July, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 28.2 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. It is the rainy season: rain falls on about 21 days, totalling 91 mm. The air is often humid and muggy. All in all, July is a good month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in July79August29° · Sea 29° · 9 h
In August, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 28.8 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. It is the rainy season: rain falls on about 22 days, totalling 105 mm. The air is often humid and muggy. All in all, August is a good month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in August76September29° · Sea 29° · 8 h
In September, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 29.3 °C – almost as warm as a bath. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 20 days, totalling 102 mm. On about 7 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a good month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in September76October29° · Sea 29° · 8 h
In October, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 29.2 °C – almost as warm as a bath. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 22 days, totalling 124 mm. The air is often humid and muggy. All in all, October is a good month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in October76November28° · Sea 29° · 8 h
In November, Saint Lucia (Castries) is hot: daytime highs average 28 °C, and even at night it stays warm at around 25 °C. The sea averages 28.6 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 19 days, totalling 103 mm. The air is often humid and muggy. All in all, November is a good month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in November84December28° · Sea 28° · 8 h
In December, Saint Lucia (Castries) is hot: daytime highs average 28 °C, and even at night it stays warm at around 24 °C. The sea averages 27.9 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. Rain is frequent, with about 13 rainy days and 43 mm in total. The air is often humid and muggy. All in all, December is an excellent month for a holiday in Saint Lucia (Castries).
Saint Lucia (Castries) in DecemberSaint Lucia (Castries) compared
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Saint Lucia (Castries) vs. Fort-de-France
In October the holiday weather in Saint Lucia (Castries) and Fort-de-France is about equally good (score 76 vs. 77). During the day Fort-de-France is 1 °C cooler than Saint Lucia (Castries). The sea is about equally warm.
| in October | Saint Lucia (Castries) | Fort-de-France |
|---|---|---|
| Holiday score | 76 | 77 |
| Daytime high | 29° | 28° |
| Sea | 29° | 29° |
| Sunshine | 8 h | 8 h |
| Rainy days | 22 | 25 |
| Best time | Dec – Jul | Dec – Apr |
Through the year
Planning a trip to Saint Lucia (Castries)
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Saint Lucia (Castries) in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Saint Lucia (Castries) has its best school-holiday weather during the Easter holidays (score 89) and its weakest during October half-term (score 76).
- 89
Easter holidays
Mar – Apr
ExcellentBest holidays
- 28 °C by day
- Sea 27 °C
- 8.9 h of sun a day
- 11 rainy days a month
Good for: Beach & swimming
- 85
May half-term
May – Jun
Excellent
- 29 °C by day
- Sea 28 °C
- 8.5 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 79
Summer holidays
Jul – Aug
Good
- 29 °C by day
- Sea 29 °C
- 8.7 h of sun a day
- 21 rainy days a month
Keep in mind: Frequent rain, Storm season
- 76
October half-term
Oct
Good
- 29 °C by day
- Sea 29 °C
- 7.9 h of sun a day
- 22 rainy days a month
Keep in mind: Frequent rain, Storm season
- 85
Christmas holidays
Dec – Jan
Excellent
- 27 °C by day
- Sea 28 °C
- 8.4 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 8 h 40 min
- Distance
- 6,770 km
- Time zone
- UTC−4
- Jet lag
- About 3 days (5 h west)
Rule of thumb for flying west: for a few days before, stay up a little later, and get afternoon and evening light at your destination.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Storm season
Saint Lucia (Castries) lies in an area that Atlantic hurricanes can reach. The hurricane season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
- January
- February
- March
- April
- May
- June: Season
- July: Season
- August: Peak
- September: Peak
- October: Peak
- November: Season
- December
Official season dates of the regional warning centres (NOAA, JMA, IMD, Météo-France, BoM); not a forecast.
Frequently asked questions about Saint Lucia (Castries)
When is the best time to visit Saint Lucia (Castries)?
The best time to visit Saint Lucia (Castries) is from December to July. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Saint Lucia (Castries)?
The sea temperature in Saint Lucia (Castries) ranges from 26.9 °C in February to 29.3 °C in September. At 20 °C and more, the sea is warm enough for swimming all year round.
Can you swim in Saint Lucia (Castries) in October?
Yes. In October the sea averages 29.2 °C – almost as warm as a bath.
What is the warmest month in Saint Lucia (Castries)?
September is the warmest month, with average highs of 29 °C and nights around 25 °C. January is the coolest month at 27 °C.
When does it rain most in Saint Lucia (Castries)?
Rain is most frequent from May to January; the wettest month is October with 124 mm. The driest month is February with 24 mm.
How many hours of sunshine does Saint Lucia (Castries) get?
Saint Lucia (Castries) gets around 3,050 hours of sunshine a year. The sunniest month is April with 8.9 hours a day; in September there are 7.7 hours a day.
What time zone is Saint Lucia (Castries) in?
Saint Lucia (Castries) uses the time zone America/St_Lucia, at UTC−4 all year.
How long is the flight from London to Saint Lucia (Castries)?
A nonstop flight from London to Saint Lucia (Castries) takes about 8 h 40 min, for a straight-line distance of about 6,770 km.
When is hurricane season in Saint Lucia (Castries)?
Saint Lucia (Castries) lies in an area that Atlantic hurricanes can reach. The hurricane season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
Which school holidays are best for Saint Lucia (Castries)?
Saint Lucia (Castries) has its best school-holiday weather during the Easter holidays (score 89) and its weakest during October half-term (score 76). Holiday ratings (0–100): Easter holidays 89, May half-term 85, Summer holidays 79, October half-term 76, Christmas holidays 85.
Near Saint Lucia (Castries)
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Places with a climate like Saint Lucia (Castries)
Destinations whose weather through the year is closest to Saint Lucia (Castries)'s – good alternatives.