Weather in Sumatra, Indonesia in September

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Visiting Sumatra, Indonesia in September

September is one of the best months to visit Sumatra for the best beach weather. It has the most sunshine and best sunbathing and swimming conditions of the year.

September has average maximum temperatures of 33°C (91°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 76% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.2hrs making the days long and bright. September has total rainfall of 12.1cm (4.8inches) making it often dry with only moderate showers. There are only 10.9 days with some rainfall so you can still enjoy the beach on the many clear days. Sea temperatures are a very warm 28°C (83°F). September is an excellent month for swimming in Sumatra with very comfortable temperatures for bathing all day.

Also consider visiting Sumatra in one of the other best months of June, July, August, for the best beach weather.

Also consider one of our other suggestions for September.

Can you sunbathe in Sumatra in September?

Yes, September is a good time for sunbathing in Sumatra.

September has average maximum temperatures of 33°C (91°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 76% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.2hrs making the days long and bright. September has total rainfall of 12.1cm (4.8inches) making it often dry with only moderate showers. There are only 10.9 days with some rainfall so you can still enjoy the beach on the many clear days.

More about September temperature and sunshine.

Can you swim in Sumatra in September?

Yes, September is an excellent month for swimming in Sumatra with very warm sea temperatures 28°C (83°F).

More about September sea temperatures.

Is September a good time to holiday in Sumatra?

Yes, September is a good time for a holiday in Sumatra.

September has average maximum temperatures of 33°C (91°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 76% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.2hrs making the days long and bright. September has total rainfall of 12.1cm (4.8inches) making it often dry with only moderate showers. There are only 10.9 days with some rainfall so you can still enjoy the beach on the many clear days. Sea temperatures are a very warm 28°C (83°F). September is an excellent month for swimming in Sumatra with very comfortable temperatures for bathing all day.

More about the September temperatures and sunshine.

Is Sumatra warm in September?

Yes, Sumatra is very hot and perfect for sunbathing on clear days in September.

The average maximum temperature in Sumatra in September is 33°C (91°F). The average maximum temperature is 32°C (89°) in the previous month and 33°C (91°F) in the next month.

The average temperature in Sumatra in September is 28°C (82°F). The average temperature is 27°C (81°F) in the previous month and 28°C (82°F) in the next month.

More info about the September temperatures and sunshine.

How sunny is Sumatra in September?

The average day light hours per day in Sumatra in September are 12.1. The sunshine percentage is 76% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.2hrs making the days long and bright.

More about September sunshine.

Temperature in Sumatra in September

The average maximum temperature in Sumatra in September is 33°C (91°F). The average maximum temperature is 32°C (89°F) in the previous month and 33°C (91°F) in the next month.

The average temperature in Sumatra in September is 28°C (82°F). The average temperature is 27°C (81°F) in the previous month and 28°C (82°F) in the next month.

The average minimum temperature in Sumatra in September is 22°C (72°F). The minimum temperature is 23°C (73°F) in the previous month and 22°C (72°F) in the next month.

Sunshine in Sumatra in September

During September the average day light hours are 12.1 per day in Sumatra. The sunshine percentage is 76% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.2hrs making the days long and bright.

The ultraviolet index in Sumatra in September is typically 14.7 during September. 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 September

The average sea water temperature in Sumatra in September is 28.4°C (83.1°F) which is very warm and ideal for relaxing and swimming for the whole day.

Rainfall in Sumatra in September

The average total rainfall in Sumatra in September is 12.1cm (4.8inches) and on average there are 10.9 rainy days in September making it a pretty wet time to visit the beach.

Humidity in Sumatra in September

The maximum dew point (an indicator of humidity) in Sumatra in September is 23°C (74°F) which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan. The dew point is 24°C (74°F) in the previous month and 24°C (24°F) in the next month.

The average maximum relative humidity in Sumatra in September is typically 91.6%. The maximum relative humidity is 92.7% in the previous month and 93.3% in the next month.

The average relative humidity in Sumatra in September is typically 72%. The average relative humidity is 75.1% in the previous month and 75.9% in the next month.

Wind Speed in Sumatra in September

The average maximum wind speed in Sumatra in September is typically 27KM/H (17MPH). The average maximum wind speed is 25KM/H (16MPH) in the previous month and 21KM/H (13MPH) in the next month.

The average wind speed in Sumatra in September is typically 8KM/H (5MPH). The average wind speed is 9KM/H (5MPH) in the previous month and 5KM/H (3MPH) in the next month.

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

Monthly Averages

Suggested Beaches in September

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Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.

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Need Inspiration?

Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.