December weather forecast
Mustique, Saint Vincent and the Grenadines

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Weather in December

December ushers in the holiday season in Mustique, Saint Vincent and the Grenadines. Rainfall takes a significant dip to 186mm (7.32"), providing a respite from the previous months' showers. Despite shorter daylight hours, consistent warmth lends an inviting aura to the island. Sea temperatures and a moderate UV index tilt favourably towards outdoor exploration. December wraps up the year with holiday charm, infusing the quintessential Caribbean weather with festive cheer.

Temperature

Mustique marks the onset of December with an average high-temperature of a still moderately hot 28°C (82.4°F), a subtle shift from November's 29°C (84.2°F). Mustique's average low-temperature for the month of December records at a pleasant 21°C (69.8°F).

Rainfall

In Mustique, in December, it is raining for 18 days, with typically 186mm (7.32") of accumulated precipitation. In Mustique, Saint Vincent and the Grenadines, during the entire year, the rain falls for 200 days and collects up to 2447mm (96.34") of precipitation.

Sea temperature

The months with the coldest seawater in Mustique are January through April and December, with an average sea temperature of 27°C (80.6°F).
Note: In any water activity, temperatures between 25°C (77°F) and 29°C (84.2°F) are viewed as magnificent and exceptionally pleasant for prolonged enjoyment.

Daylight

With an average of 11h and 24min of daylight, December has the shortest days of the year in Mustique, Saint Vincent and the Grenadines.
On the first day of December, sunrise is at 06:11 and sunset at 17:36. On the last day of the month, sunrise is at 06:26 and sunset at 17:49 AST.

Sunshine

January through August, November and December, with an average of 8h of sunshine, are months with the most sunshine.

UV index

December is the month with the lowest UV index in Mustique, with an average maximum UV index of 9. A UV Index estimate of 8 to 10 represents a very high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 9 during December translates into the following guidance:
Without proper safety measures, skin and eyes can be quickly harmed. Be sure to protect yourself. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Despite the cloudy weather, sunscreen with a sun protection factor of at least 30 should be liberally applied and reapplied, including after a swim or outdoor activity. Heads up! Sand and water reflection magnifies the UV exposure from the Sun.
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Frequently asked questions

Is it hot in Mustique during December?

During December, Mustique experiences an average high-temperature of 28°C (82.4°F) and a low-temperature of 21°C (69.8°F).

How many days does it rain in December in Mustique?

In December, in Mustique, the rain falls for 18 days. Throughout December, 186mm (7.32") of precipitation is accumulated.

What are the months with the coldest sea water in Mustique?

January through April and December, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater.

What is the water temperature in December in Mustique?

In December, the average sea temperature is 27°C (80.6°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Mustique?

December has the shortest days of the year in Mustique, with an average of 11h and 24min of daylight.

How many hours of daylight does Mustique have in December?

The average day length in December in Mustique, Saint Vincent and the Grenadines, is 11h and 23min.

When are sunrise and sunset in December in Mustique?

On the first day of December, sunrise is at 06:11 and sunset at 17:36. On the last day of the month, sunrise is at 06:26 and sunset at 17:49 AST.

What is the month with the most sunshine in Mustique?

January through August, November and December, with an average of 8h of sunshine, are months with the most sunshine in Mustique, Saint Vincent and the Grenadines.

How long on average sun shines in December in Mustique?

In Mustique, the average sunshine duration in December is 8h.

When is the lowest UV index in Mustique?

The month with the lowest UV index in Mustique, Saint Vincent and the Grenadines, is December, with an average maximum UV index of 9.

What is the UV index reading in December in Mustique?

The average daily maximum UV index in December in Mustique, Saint Vincent and the Grenadines, is 9. A UV Index estimate of 8 to 10 represents a very high health threat from exposure to the Sun's UV radiation.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
Mustique, Saint Vincent and the Grenadines

Average temperature in December - Mustique, Saint Vincent and the Grenadines
  • Average high temperature in December: 28°C

The warmest month (with the highest average high temperature) is May (30°C).
The months with the lowest average high temperature are January and February (27°C).

  • Average low temperature in December: 21°C

The months with the highest average low temperature are May, June, July, August, September and October (23°C).
The coldest months (with the lowest average low temperature) are January, February, March and December (21°C).

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Average rainfall in December
Mustique, Saint Vincent and the Grenadines

Average rainfall in December - Mustique, Saint Vincent and the Grenadines
  • Average rainfall in December: 186mm

The wettest month (with the highest rainfall) is October (309mm).
The driest month (with the least rainfall) is February (97mm).

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Average rainfall days in December
Mustique, Saint Vincent and the Grenadines

Average rainfall days in December - Mustique, Saint Vincent and the Grenadines
  • Average rainfall days in December: 18 days

The months with the highest number of rainy days are July and September (21 days).
The month with the least rainy days is April (10 days).

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Average sea temperature in December
Mustique, Saint Vincent and the Grenadines

Average sea temperature in December - Mustique, Saint Vincent and the Grenadines
  • Average sea temperature in December: 27°C

The best months for swimming (with the highest average sea temperature) are September and October (29°C).
The coldest months (with the lowest average sea temperature) are January, February, March, April and December (27°C).

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Average daylight in December /
Average sunshine in December
Mustique, Saint Vincent and the Grenadines

Average daylight in December / Average sunshine in December - Mustique, Saint Vincent and the Grenadines
  • Average daylight in December: 11h and 2min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 24min).

  • Average sunshine in December: 8h

The months with the most sunshine are January, February, March, April, May, June, July, August, November and December (Average sunshine: 8h).
The months with the least sunshine are September and October (Average sunshine: 7h).

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Average UV index in December
Mustique, Saint Vincent and the Grenadines

Average UV index in December - Mustique, Saint Vincent and the Grenadines
  • Average UV index in December: 9

The months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).

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Mustique, Saint Vincent and the Grenadines

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