December weather forecast
Arugam Bay, Sri Lanka

Rounding off the year, December continues to host the monsoon season within Arugam Bay with a significant increase in rain recorded from the preceding month. Even though the rain dominates the weather, the temperatures remain on the warmer side offering a unique warm rainfall situation. The relative humidity peaks and is the highest for the entire year. Besides, the wind reaches its fastest speeds this month, adding a chilly nip to the air. As the curtain drops on December, the weather resets itself to invite a fresh cycle for the upcoming year.

Temperature

As Arugam Bay welcomes December, the average high-temperature stabilizes at a still warm 28°C (82.4°F), showing little deviation from November's 29.3°C (84.7°F). Nighttime temperature reflects an average dip to a still warm 24.5°C (76.1°F) in December, subtly cooler than its daytime highs.

Heat index

For most parts of December, the heat index is evaluated at a hot 32°C (89.6°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Heat index specifics point out values are for conditions of shade and a slight breeze. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.

Humidity

The most humid month is December, with an average relative humidity of 81%.

Rainfall

December is the month with the most rainfall. Rain falls for 25.2 days and accumulates 272mm (10.71") of precipitation.

Sea temperature

January, February, July through September and December, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater.
Note: Water temperature ranging from 25°C (77°F) to 29°C (84.2°F) is seen as very warm and delightful by everyone. During these temperatures, water activities become enjoyable, without causing discomfort for extended periods.

Daylight

The month with the shortest days is December, with an average of 11h and 42min of daylight.
On the first day of December, sunrise is at 05:59 and sunset at 17:44. On the last day of the month, sunrise is at 06:13 and sunset at 17:57 +0530.

Sunshine

The month with the least sunshine is December, with an average of 5.4h of sunshine.

UV index

November and December, with an average maximum UV index of 6, are months with the lowest UV index in Arugam Bay. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, a daily maximum UV index of 6 leads to the following instructions:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Alert! The Sun's UV rays are heightened by the reflection of sand and water.