December weather forecast
Saint-Denis, Reunion

December concludes the weather calendar of Saint-Denis with variable elements. Temperatures take their last hike for the year and moderate rainfall resumes. The sea temperatures also begin to rise, highlighting a warming trend in anticipation of the upcoming first quarter. The increased daylight hours spanning up to 13.4 hours add to the city’s festive spirit as it closes the year with a blend of warmth and showers, characteristic of Saint-Denis’s tropical weather.

Temperature

The initiation of December records an average high-temperature of a still warm 29.1°C (84.4°F), displaying a near consistency with the previous month. Saint-Denis records an average nighttime low of 22.4°C (72.3°F) in December.

Rainfall

In Saint-Denis, in December, it is raining for 11.1 days, with typically 189mm (7.44") of accumulated precipitation. In Saint-Denis, during the entire year, the rain falls for 119.3 days and collects up to 1659mm (65.31") of precipitation.

Sea temperature

In December, the average sea temperature is 26.8°C (80.2°F).
Note: Swimming, diving, and other activities in water temperatures between 25°C (77°F) and 29°C (84.2°F) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.

Daylight

December has the longest days of the year in Saint-Denis, with an average of 13h and 24min of daylight.
On the first day of December in Saint-Denis, sunrise is at 05:28 and sunset at 18:46. On the last day of the month, sunrise is at 05:39 and sunset at 19:02 +04.

Sunshine

April and December, with an average of 7.4h of sunshine, are months with the most sunshine.

UV index

The months with the highest UV index in Saint-Denis are January through March, November and December, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to UV radiation for the average person.
Note: In December, a regular UV index of 12 translates into these guidelines:
Enforce all necessary safety measures, unprotected skin may suffer burns swiftly. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Broad-spectrum sunscreen with an SPF of 30 or above should be applied generously and reapplied every two hours and right after any outdoor activity or swim. Warning! The Sun's UV rays intensify with reflections from sand and water.