Monthly climate guide
Castries weather in December
Expect hot weather in Castries in December: afternoons reach about 28°C (82°F), while nights drop to around 27°C (80°F). Around 67 mm of rain falls over the month (some rain), and skies are a mix of sun and cloud. Daytime highs are about the same as November and about the same as January.
What stands out in December
- Humidity near 77% makes 28°C feel stickier than it sounds.
- There's little difference between day and night (around 1°C).
- Nights stay warm, rarely below 27°C — air-conditioning helps.
Avg high
28°C
82°F
Avg low
27°C
80°F
Rainfall
67 mm
some rain
Humidity
77%
relative
Sky
40%
cloud · a mix of sun and cloud
Castries weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 27°C / 81°F | 26°C / 79°F | 50 mm | 76% | 39% |
| February | 27°C / 81°F | 26°C / 78°F | 37 mm | 75% | 38% |
| March | 27°C / 81°F | 26°C / 78°F | 40 mm | 75% | 45% |
| April | 28°C / 82°F | 26°C / 79°F | 81 mm | 76% | 54% |
| May | 28°C / 83°F | 27°C / 80°F | 79 mm | 78% | 59% |
| June | 29°C / 84°F | 27°C / 81°F | 82 mm | 79% | 64% |
| July | 29°C / 84°F | 28°C / 82°F | 99 mm | 79% | 51% |
| August | 29°C / 84°F | 28°C / 82°F | 133 mm | 79% | 49% |
| September | 29°C / 85°F | 28°C / 83°F | 110 mm | 78% | 51% |
| October | 29°C / 84°F | 28°C / 82°F | 122 mm | 78% | 56% |
| November | 29°C / 83°F | 27°C / 81°F | 135 mm | 79% | 53% |
| December | 28°C / 82°F | 27°C / 80°F | 67 mm | 77% | 40% |
What to pack for December
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A small travel umbrella, just in case
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is December a good time to visit Castries?
Compare the months in the chart above to find your ideal window.
Best time to visit Castries →Cite or embed this data
Writing about this destination? Copy a ready-made citation or embed a live widget — free, just keep the link.
Castries weather in December. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/saint-lucia/castries/december
<a href="https://weathercompare.eu/weather/saint-lucia/castries/december">Castries weather in December</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/saint-lucia/castries" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Castries weather in December"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/saint-lucia/castries/december">Castries weather in December</a> – WeatherCompare</p>
Castries in December: quick answers
Is December a good time to visit Castries?
December is a reasonable time for Castries: highs around 28°C and about 67 mm of rain, though not one of the three best months.
How warm is Castries in December?
Average highs are about 28°C (82°F) and average lows about 27°C (80°F), based on 10 years of daily data.
Does it rain a lot in Castries in December?
Castries typically gets around 67 mm of rain in December — some rain.
Figures are long-term averages for the area around Castries (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.