Normal weather for Sumatra in September
It's hot in September in Sumatra with an average temperature of 33°C. Temperatures this month range from a low of 32°C to a high of 34°C. At night, you can expect temperatures between 23°C and 24°C.
In September, there is an average of 160 mm of precipitation, spread over 18 days. The wind speed is around 2 Bft, mostly coming from the South.
After some sun? Then September isn’t the best time to be in Sumatra. The temperature is pleasant, but there’s too much chance of rain this month.
Sumatra in September |
UK | ||
|---|---|---|---|
 Average Temperature |
33°C | 20°C | |
 High Temp |
34°C | 22°C | |
| Low Temp |
32°C | 17°C | |
 Total Precipitation |
160 mm | 44 mm | |
| Rainy Days |
18 days | 8 days | |
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
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Start of September
The month of September starts in Sumatra with hot temperatures, averaging around 33°C during the day and nights close to 24°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-September
By mid-September, the average daytime temperature stays the same at 33°C, with nights close to 24°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of September
By the end of September, the average daytime temperature in Sumatra will be around 33°C, with nights close to 24°C. There’s a significant chance of many days with precipitation.
Temperature records
With 36°C, Sumatra hit the highest temperature in the last 10 years in September 2019. The lowest daytime temperature in this month was 24°C in 2023. The extreme night temperatures ranged from a low of 20°C to a high of 26°C.
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Daily Temperature in September in Sumatra
This chart shows the average daily temperatures, both day and night, for each day in September in Sumatra, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Sumatra
The chart below shows the average daily precipitation in September for Sumatra, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 18 days of rain in Sumatra.
Daily UV Index in September in Sumatra
This chart shows the average daily UV index in September in Sumatra, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Sumatra Over the Years
This chart shows the average temperature in September in Sumatra, measured in degrees Celsius, over the past years.
Total Precipitation in September in Sumatra Over the Years
This chart shows the average precipitation in September in Sumatra, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Sumatra
Click on a specific day in September for detailed info on the typical weather on that day in Sumatra. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Sumatra
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Average Weather in Sumatra by Month
Click on a month below to see detailed weather info for Sumatra. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
