December weather forecast
Saint Louis, Senegal

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Weather in December

December in Saint Louis ushers in a shift towards cooler weather, with the average lowest dropping to 16.4°C (61.5°F). This month is also subject to minor rainfall of only 1mm (0.04"), continuing the dry streak initiated in November. Throughout December, high temperatures hover around 31°C (87.8°F), and the city experiences decreasing humidity, marking an excellent time to walk around and explore. The sea temperature stands at 23.3°C (73.9°F), making a swim in the sea a brisk but enjoyable experience. As the daylight hours draw in, the city becomes a spectacle of twinkling lights, offering a charming holiday ambiance.

Temperature

The transition into December in Saint Louis reveals an average high-temperature of a still tropical 31°C (87.8°F), mirroring a close resemblance to November. In December, a remarkable difference from daytime highs is noted, as Saint Louis records an average temperature of 16.4°C (61.5°F) during the night.

Heat index

The heat index value for December is computed to be a tropical 32°C (89.6°F). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are of high significance for children. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.

Humidity

In Saint Louis, Senegal, the average relative humidity in December is 45%.

Rainfall

Throughout December, 1mm (0.04") of precipitation is accumulated. During the entire year, Saint Louis aggregates up to 261mm (10.28") of precipitation.

Sea temperature

In Saint Louis, in December, the average water temperature is 23.3°C (73.9°F).
Note: Considering one's resistance to cold, elements like sunshine, wind, and the prevailing temperature matter when taking a swim in 23.3°C (73.9°F) waters. (For comparison, the Olympic swimming standard is set between 25°C (77°F) and 28°C (82.4°F).)

Daylight

December has the shortest days of the year in Saint Louis, with an average of 11h and 12min of daylight.
On the first day of December in Saint Louis, sunrise is at 07:17 and sunset at 18:32. On the last day of the month, sunrise is at 07:33 and sunset at 18:44 GMT.

Sunshine

The average sunshine in December is 7.5h.

UV index

January and December, with an average maximum UV index of 8, are months with the lowest UV index. A UV Index reading of 8 to 10 represents a very high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The average daily UV index of 8 in December transforms into the following instructions:
Don't neglect protection; skin and eyes can be burned swiftly if left exposed. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Caution! Sand and water surfaces escalate the UV intensity from the Sun.

Frequently asked questions

How hot is December in Saint Louis?

The high-temperature, in December, in Saint Louis, is 31°C (87.8°F), while the low-temperature averages to 16.4°C (61.5°F). The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in December is computed to be 32°C (89.6°F).

What is the average humidity in December in Saint Louis?

The average relative humidity in December in Saint Louis is 45%.

How much does it rain in Saint Louis in December?

During December, Saint Louis regularly aggregates up to 1mm (0.04") of precipitation.

What is the sea temperature in December in Saint Louis?

In December, the average sea temperature in Saint Louis, Senegal, is 23.3°C (73.9°F). For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 23.3°C (73.9°F).

What is the month with the shortest days in Saint Louis?

December has the shortest days of the year, with an average of 11h and 12min of daylight.

How many hours of daylight does Saint Louis have in December?

In Saint Louis, Senegal, the average day length in December is 11h and 11min.

When is the sunrise / sunset in December in Saint Louis?

In December, on the first day of the month, sunrise is at 07:17 and sunset at 18:32. On the last day of the month, in Saint Louis, Senegal, sunrise is at 07:33 and sunset at 18:44 GMT.

How many hours of sunshine does Saint Louis have in December?

In December, the average sunshine duration in Saint Louis is 7.5h.

When is the lowest UV index in Saint Louis?

The months with the lowest UV index in Saint Louis are January and December, with an average maximum UV index of 8.

How high is the UV index in December in Saint Louis?

In December, the average daily maximum UV index is 8. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
Saint Louis, Senegal

Average temperature in December - Saint Louis, Senegal
  • Average high temperature in December: 31°C

The warmest month (with the highest average high temperature) is October (33.7°C).
The month with the lowest average high temperature is May (30.3°C).

  • Average low temperature in December: 16.4°C

The month with the highest average low temperature is September (25.1°C).
The coldest month (with the lowest average low temperature) is January (15.2°C).

Average humidity in December
Saint Louis, Senegal

Average humidity in December - Saint Louis, Senegal
  • Average humidity in December: 45%

The month with the highest relative humidity is August (80%).
The month with the lowest relative humidity is January (44%).

Average rainfall in December
Saint Louis, Senegal

Average rainfall in December - Saint Louis, Senegal
  • Average rainfall in December: 0.7mm

The wettest month (with the highest rainfall) is August (94.3mm).
The driest month (with the least rainfall) is April (0mm).

Average rainfall days in December
Saint Louis, Senegal

Average rainfall days in December - Saint Louis, Senegal
  • Average rainfall days in December: 0 days

The months with the highest number of rainy days are August and September (6 days).
The months with the least rainy days are March, April, May, November and December (0 days).

Average sea temperature in December
Saint Louis, Senegal

Average sea temperature in December - Saint Louis, Senegal
  • Average sea temperature in December: 23.3°C

The best month for swimming (with the highest average sea temperature) is September (28.2°C).
The coldest month (with the lowest average sea temperature) is March (19.6°C).

Average daylight in December /
Average sunshine in December
Saint Louis, Senegal

Average daylight in December / Average sunshine in December - Saint Louis, Senegal
  • Average daylight in December: 11h and 1min

The month with the longest days is June (Average daylight: 13h and 6min).
The month with the shortest days is December (Average daylight: 11h and 12min).

  • Average sunshine in December: 7h and 3min

The month with the most sunshine is April (Average sunshine: 9h and 30min).
The month with the least sunshine is June (Average sunshine: 7h and 24min).

Average UV index in December
Saint Louis, Senegal

Average UV index in December - Saint Louis, Senegal
  • Average UV index in December: 8

The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The months with the lowest UV index are January and December (UV index 8).

Saint Louis, Senegal

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