Monthly climate guide

Castries weather in March

March in Castries is typically hot, with average daytime highs around 27°C (81°F) and night-time lows near 26°C (78°F). The month usually brings about 40 mm of rain (fairly dry) and is a mix of sun and cloud. Daytime highs are about the same as February and about the same as April.

What stands out in March

Humidity near 75% makes 27°C feel stickier than it sounds.
Only 2 months are cooler in Castries than March.
It's one of the drier stretches of the year in Castries.
There's little difference between day and night (around 2°C).

Avg high

27°C

81°F

Avg low

26°C

78°F

Rainfall

40 mm

fairly dry

Humidity

75%

relative

Sky

45%

cloud · a mix of sun and cloud

Live Castries forecast Where else to go in March

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Castries weather by month

Low → high °C Rain (mm)

Show the monthly averages as a table

Average monthly climate in Castries
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 March

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

Full season-by-season packing guide →

Is March a good time to visit Castries?

Compare the months in the chart above to find your ideal window.

Best time to visit Castries →

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Castries weather in March. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/saint-lucia/castries/march

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Castries in March: quick answers

Is March a good time to visit Castries?

Yes. March is one of the best months for Castries, with highs around 27°C and about 40 mm of rain.

How warm is Castries in March?

Average highs are about 27°C (81°F) and average lows about 26°C (78°F), based on 10 years of daily data.

Does it rain a lot in Castries in March?

Castries typically gets around 40 mm of rain in March — fairly dry.

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.