St Lucia weather in January 2026

Expect daytime maximum temperatures of 28°C in St Lucia in January based on long-term weather averages. There are 8 hours of sunshine per day on average with 17 days with some rainfall and typically 113 mm of rainfall in the month.

  • 28°C maximum daytime temperature in January in St Lucia (Castries)28
    28°C max day temperature
  • 8 hours of sunshine per day
  • 17 days with some rainfall in January in St Lucia (Castries)17
    17 days with some rainfall
  • 22°C minimum night-time temperature in January in St Lucia (Castries)22
    22°C min night temperature
  • 11 hours of daylight per day in January in St Lucia (Castries)11
    11 hours of daylight per day
  • Moderate heat & humidity in January in St Lucia (Castries)M
    Moderate heat & humidity
  • 113 mm monthly rainfall in January in St Lucia (Castries)113
    113 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in January in St Lucia (Castries)9
    9 (Very High) UV index
  • 27°C sea temperature in January in St Lucia (Castries)27
    27°C sea temperature

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The January weather guide for St Lucia (Castries) shows long term 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.

Top St Lucia destinations

Below are average maximum temperatures at popular countries, regions and places in St Lucia in January. Select a holiday destination to see more weather parameters.

All St Lucia destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about St Lucia

How hot is it in St Lucia in January?

Daytime temperatures usually reach 28°C in Castries, St Lucia in January with moderate heat and humidity, falling to 22°C at night.

How sunny is it in St Lucia in January?

There are normally 8 hours of bright sunshine each day in Castries, St Lucia in January - that's 72% of daylight hours.

How warm is the sea around St Lucia in January?

The average sea temperature around Castries, St Lucia in January is 27°C.

Does it rain in St Lucia in January?

There are usually 17 days with some rain in Castries, St Lucia in January and the average monthly rainfall is 113mm.

St Lucia January sunrise & sunset times

Browse the sunrise and sunset times for St Lucia in January 2026. Select a month to view St Lucia sunrise and sunset times for the next 12 months. The St Lucia sunrise and sunset times shown below are for Castries.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 06:28 17:47
Friday, 16th January 2026 06:32 17:56
Saturday, 31st January 2026 06:32 18:03

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