Also consider one of our other suggestions for September.
The average maximum temperature in Sumatra in September is 33°. The average maximum temperature is 32° in the previous month and 33° in the next month.
The average temperature in Sumatra in September is 28°. The average temperature ranges is 27° in the previous month and 28° in the next month.
The average minimum temperature in Sumatra in September is 22°. The minimum temperature is 23° in the previous month and 22° in the next month.
The average day light hours per day in Sumatra in September are 12.1 and there are 9.2 hours of sunshine per day on average during September making it a sunny month with few clouds.
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.
The average sea water temperature in Sumatra in September is 28.4° which is very warm and ideal for relaxing and swimming for the whole day.
The average total rainfall in Sumatra in September is 2.7cm and on average there are 6.2 rainy days in September making it a dry time to visit the beach.
The maximum dew point (an indicator of humidity) in Sumatra in September is 23° 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° in the previous month and 24° 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.
The average maximum wind speed in Sumatra in September is typically 27kmh. The average maximum wind speed is 25kmh in the previous month and 21kmh in the next month.
The average wind speed in Sumatra in September is typically 8kmh. The average wind speed is 9kmh in the previous month and 5kmh in the next month.
The average wind direction in Sumatra in September is from the North.
