Weather in Sumatra, Indonesia in December

So you're interested in going to Sumatra, Indonesia in December

December is a hot and very rainy time for sunbathing in Sumatra. December is an excellent month for swimming in Sumatra with very warm sea temperatures. Consider visiting Sumatra in the months of February, March, August, September, for the best beach weather. Also consider one of our other suggestions for December.

Temperature in Sumatra in December

The average maximum temperature in Sumatra in December is 30°. The average maximum temperature is 31° in the previous month and 29° in the next month.

The average temperature in Sumatra in December is 27°. The average temperature ranges is 27° in the previous month and 27° in the next month.

The average minimum temperature in Sumatra in December is 23°. The minimum temperature is 23° in the previous month and 23° in the next month.

Sunshine in Sumatra in December

The average day light hours per day in Sumatra in December are 12.3 and there are 6.4 hours of sunshine per day on average during December making it a quite sunny month with some cloud cover.

The ultraviolet index in Sumatra in December is typically 13.6 during December. An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Sumatra in December

The average sea water temperature in Sumatra in December is 29.4° which is very warm and ideal for relaxing and swimming for the whole day.

Rainfall in Sumatra in December

The average total rainfall in Sumatra in December is 28cm and on average there are 25.8 rainy days in December making it a very wet time to visit the beach.

Humidity in Sumatra in December

The maximum dew point (an indicator of humidity) in Sumatra in December is 25° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning. The dew point is 24° in the previous month and 24° in the next month.

The average maximum relative humidity in Sumatra in December is typically 97%. The maximum relative humidity is 96% in the previous month and 93.1% in the next month.

The average relative humidity in Sumatra in December is typically 87.6%. The average relative humidity is 85% in the previous month and 81.9% in the next month.

Wind Speed in Sumatra in December

The average maximum wind speed in Sumatra in December is typically 20kmh. The average maximum wind speed is 16kmh in the previous month and 24kmh in the next month.

The average wind speed in Sumatra in December is typically 6kmh. The average wind speed is 3kmh in the previous month and 11kmh in the next month.

The average wind direction in Sumatra in December is from the North.

Monthly Averages

Suggested Beaches in December

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