Saint-Denis
Reunion
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Saint-Denis, Reunion

An aerial panoramic shot of the glorious landscape of the Saint-Denis city, on Reunion Island
An aerial panoramic shot of the glorious landscape of the Saint-Denis city, on Reunion Island
December, the first month of the summer, in Saint-Denis, is still a warm month, with average temperature varying between 29.1°C (84.4°F) and 22.4°C (72.3°F).

Temperature

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

Rainfall

In December, the rain falls for 11.1 days. Throughout December, 188.7mm (7.4") of precipitation is accumulated. Throughout the year, there are 119.3 rainfall days, and 1658.6mm (65.3") of precipitation is accumulated.

Sea temperature

In Saint-Denis, the average seawater temperature in December is 26.8°C (80.2°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

December has the longest days of the year, with an average of 13.4h of daylight.

Sunshine

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

UV index

Months with the highest UV index are January through March, November and December, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV rays for the average 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in December in Saint-Denis?

The average high-temperature, in December, is 29.1°C (84.4°F), while the average low-temperature is 22.4°C (72.3°F).

How many days does it rain in December in Saint-Denis?

In Saint-Denis, Reunion, in December, it is raining for 11.1 days, with typically 188.7mm (7.4") of accumulated precipitation.

What is the water temperature in December in Saint-Denis?

In Saint-Denis, in December, the average water temperature is 26.8°C (80.2°F). 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.

When are the longest days in Saint-Denis?

December has the longest days of the year in Saint-Denis, with an average of 13.4h of daylight.

How many hours of daylight does Saint-Denis have in December?

In December, the average length of the day is 13.4h.

What is the month with the most sunshine in Saint-Denis?

Months with the most sunshine in Saint-Denis, Reunion, are April and December, with an average of 7.4h of sunshine.

How long on average sun shines in December in Saint-Denis?

The average sunshine in December in Saint-Denis, Reunion, is 7.4h.

What are the months with the highest UV index in Saint-Denis?

Months with the highest UV index in Saint-Denis, Reunion, are January through March, November and December, with an average maximum UV index of 12.

What is the UV index reading in December in Saint-Denis?

In Saint-Denis, Reunion, the average daily maximum UV index in December is 12. A UV Index reading of 11, and higher, represents an excessive health risk from unsafe exposure to the Sun's UV rays.
Average temperature in December - Saint-Denis, Reunion
  • Average high temperature in December: 29.1°C

Warmest months (with the highest average high temperature) are January and February (30.1°C).
The month with the lowest average high temperature is July (25.2°C).

  • Average low temperature in December: 22.4°C

The month with the highest average low temperature is February (23.7°C).
The coldest month (with the lowest average low temperature) is August (18°C).

Average rainfall in December - Saint-Denis, Reunion
  • Average rainfall in December: 188.7mm

The wettest month (with the highest rainfall) is February (351mm).
The driest month (with the lowest rainfall) is October (43.4mm).

Average rainfall days in December - Saint-Denis, Reunion
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is February (14.3 days).
The month with the lowest number of rainy days is November (5.9 days).

Average sea temperature in December - Saint-Denis, Reunion
  • Average sea temperature in December: 26.8°C

The best month for swimming (with the highest average sea temperature) is March (28.5°C).
Coldest months (with the lowest average sea temperature) are August and September (23.8°C).

Average daylight in December / Average sunshine in December - Saint-Denis, Reunion
  • Average daylight in December: 13.4h

The month with the longest days is December (Average daylight: 13.4h).
The month with shortest days is June (Average daylight: 10.9h).

  • Average sunshine in December: 7.4h

Months with most sunshine are April and December (Average sunshine: 7.4h).
Months with least sunshine are January and October (Average sunshine: 6.8).

Average UV index in December - Saint-Denis, Reunion
  • Average UV index in December: 12

Months with the highest UV index are January, February, March, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 6).