December weather forecast
Saint-Denis, Reunion

The first month of the summer, December, is still a warm month in Saint-Denis, Reunion, with an average temperature ranging between min 22.4°C (72.3°F) and max 29.1°C (84.4°F).

Temperature

In December, the average high-temperature is relatively the same as in November - a still warm 29.1°C (84.4°F). In Saint-Denis, in December, the average low-temperature is 22.4°C (72.3°F).

Rainfall

In Saint-Denis, during December, the rain falls for 11.1 days and regularly aggregates up to 189mm (7.44") of precipitation. Throughout the year, in Saint-Denis, there are 119.3 rainfall days, and 1659mm (65.31") of precipitation is accumulated.

Sea temperature

In Saint-Denis, the average water temperature is 26.8°C (80.2°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The month with the longest days is December, with an average of 13h and 23min of daylight.
On the first day of the month, sunrise is at 05:28 and sunset at 18:46. On the last day of December, in Saint-Denis, Reunion, 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

January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index in Saint-Denis. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 12 in December transform into the following instructions:
Take all necessary precautions, as unprotected skin can burn in minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.