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Weather in Saint Lucia - today, tomorrow and 14-day forecast

Below: today's conditions city by city, a live weather map, the 14-day outlook and month-by-month climate to help you pick the best time to travel.

single country point. About & methodology.

Next days in Saint Lucia

today🌧️ 31°💧 1.7 mm
Sun🌧️ 31°💧 1.2 mm
Mon🌤️ 30°💧 0.4 mm
Tue🌧️ 29°💧 1.3 mm
Wed🌧️ 29°💧 6.2 mm
Thu🌧️ 28°💧 7.4 mm
Fri🌧️ 28°💧 16.3 mm
Sat🌧️ 27°💧 16.3 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Saturday 5 Sept in Saint Lucia, the forecast high is 31°C. Typical daytime temperatures at this time of year range from 29°C to 30°C, so it will be exceptionally warm. It is warmer than 99% of similar days.

31°Cexceptionally warm
usually 29°C–30°C
warmer than 99% of similar days
night: exceptionally warm rain: typical rainfall wind: typical
31°Cexceptionally warm
usually 29°C–30°C
warmer than 99% of similar days
night: cooler than usual rain: typical rainfall wind: typical
30°Cexceptionally warm
usually 29°C–30°C
warmer than 97% of similar days
night: cooler than usual rain: less rain than usual wind: typical
29°Cwarmer than usual
usually 29°C–30°C
warmer than 74% of similar days
night: cooler than usual rain: typical rainfall wind: stronger than usual
29°Cnear normal
usually 29°C–30°C
night: exceptionally cool rain: more rain than usual wind: stronger than usual
28°Ccooler than usual
usually 29°C–30°C
cooler than 88% of similar days
night: exceptionally cool rain: more rain than usual wind: typical
28°Cexceptionally cool
usually 28°C–30°C
cooler than 97% of similar days
night: exceptionally cool rain: more rain than usual wind: exceptionally strong

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
25°30°35° 1981: 29°C1982: 28°C1983: 29°C1984: 28°C1985: 29°C1986: 28°C1987: 29°C1988: 28°C1989: 29°C1990: 28°C1991: 28°C1992: 28°C1993: 29°C1994: 28°C1995: 29°C1996: 28°C1997: 29°C1998: 29°C1999: 29°C2000: 29°C2001: 29°C2002: 29°C2003: 29°C2004: 29°C2005: 30°C2006: 29°C2007: 29°C2008: 29°C2009: 29°C2010: 29°C2011: 29°C2012: 29°C2013: 29°C2014: 29°C2015: 30°C2016: 30°C2017: 30°C2018: 30°C2019: 30°C2020: 30°C2021: 30°C2022: 30°C2023: 31°C2024: 30°C2025: 30°C 2026 forecast: 30°C current forecast 30°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 29°C by day. The coolest year was 1986 (28°C) and the warmest was 2023 (31°C). The current forecast averages 30°C - higher than in 76% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Saint Lucia

Saint Lucia - 14-day weather forecast infographic

Day-by-day forecast for Saint Lucia

Saturday5 September 2026
🌧️31°light rain
night 29° · evening 29° · rain 1.72 mm · humidity 68% · wind 6 m/s · clouds 23%
Sunday6 September 2026
🌧️31°light rain
night 27° · evening 28° · rain 1.22 mm · humidity 68% · wind 7 m/s · clouds 8%
Monday7 September 2026
🌤️30°a few clouds
night 28° · evening 28° · rain 0.36 mm · humidity 65% · wind 8 m/s · clouds 12%
Tuesday8 September 2026
🌧️29°light rain
night 27° · evening 28° · rain 1.31 mm · humidity 67% · wind 8 m/s · clouds 14%
Wednesday9 September 2026
🌧️29°light rain
night 27° · evening 28° · rain 6.17 mm · humidity 70% · wind 9 m/s · clouds 70%
Thursday10 September 2026
🌧️28°light rain
night 27° · evening 28° · rain 7.38 mm · humidity 77% · wind 8 m/s · clouds 100%
Friday11 September 2026
🌧️28°moderate rain
night 27° · evening 27° · rain 16.26 mm · humidity 78% · wind 9 m/s · clouds 97%
Saturday12 September 2026
🌧️27°moderate rain
night 27° · evening 27° · rain 16.26 mm · humidity 81% · wind 8 m/s · clouds 100%
Sunday13 September 2026
🌧️28°light rain
night 27° · evening 28° · rain 3.84 mm · humidity 75% · wind 8 m/s · clouds 99%
Monday14 September 2026
🌧️28°light rain
night 27° · evening 27° · rain 4.32 mm · humidity 80% · wind 7 m/s · clouds 100%
Tuesday15 September 2026
🌧️28°moderate rain
night 27° · evening 27° · rain 14.97 mm · humidity 80% · wind 7 m/s · clouds 100%
Wednesday16 September 2026
🌧️26°moderate rain
night 26° · evening 25° · rain 13.71 mm · humidity 84% · wind 7 m/s · clouds 100%
Thursday17 September 2026
🌧️26°moderate rain
night 24° · evening 24° · rain 38.79 mm · humidity 86% · wind 8 m/s · clouds 100%
Friday18 September 2026
🌧️27°light rain
night 27° · evening 27° · rain 0.21 mm · humidity 79% · wind 8 m/s · clouds 100%
Saturday19 September 2026
🌧️29°light rain
night 27° · evening 28° · rain 1.17 mm · humidity 74% · wind 8 m/s · clouds 9%

Sea temperature - Saint Lucia

Water today
29°C
Week avg
29°C
Waves today
0.8 m
How's the water?
very warm
16-day sea temperature forecast:
5.09 29°C6.09 29°C7.09 29°C8.09 29°C9.09 29°C10.09 29°C11.09 29°C12.09 29°C13.09 29°C
Average sea temperature through the year:
Jan 28°CFeb 27°CMar 28°CApr 28°CMay 29°CJun 29°CJul 29°CAug 30°CSep 31°COct 30°CNov 29°CDec 28°C
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Weather in other countries in Caribbean

Trinidad and TobagoSaint Vincent and the GrenadinesTurks and Caicos IslandsSaint MartinVirgin IslandsSaint Kitts and Nevis

FAQ - Saint Lucia weather

What is the weather like in Saint Lucia today?
Today it is about 31° during the day and 29° at night, light rain.
How far ahead can I check the forecast for Saint Lucia?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.