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Sri LankaThe weather in September in Round Island
It's hot in September in Round Island with an average temperature of 31°C. Temperatures this month range from a low of 30°C to a high of 32°C. At night, you can expect temperatures between 24°C and 26°C.
Looking for sun? September isn’t a good month to be in Round Island. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Round Island, Sri Lanka. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 36°C in 2018, Round Island reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 26°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 10°C to a highest value of 28°C.
Rainfall amount
In September, there is an average of 450 mm of precipitation, spread over 27 days. The wind speed is around 4 Bft, mostly coming from the Southwest.
Daily weather in September for Round Island
Click on any day in September to get detailed info about the usual weather on that day in Round Island. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Round Island | New York | |
|---|---|---|
| Average temperature | 31°C | 27°C |
| Max. temperature | 32°C | 31°C |
| Min. temperature | 24°C | -5°C |
| Total precipitation | 450 mm | 57 mm |
| Rainy days | 27 days | 9 days |
Start of September
The month of September starts in Round Island with hot temps, averaging around 31°C during the day and nights around 25°C.
Mid September
By mid-September, daytime temps rise to around 32°C, with nights around 26°C. There’s a high chance of precipitation during this time.
End of September
By the end of September, the average daytime temperature in Round Island is around 32°C, while nighttime temps are about 25°C. There’s a significant chance of many days with precipitation.
UV index
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.
Check out the climate of Round Island for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Round Island, Sri Lanka. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Round Island
Temperature in September in Round Island over the years
Precipitation charts
These charts show the average amount of precipitation in September in Round Island, Sri Lanka. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Round Island
Total precipitation in September in Round Island over the years
Daily UV index in September in Round Island
This chart shows the average daily UV index in September in Round Island, 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.
Weather experiences in September in Round Island
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Average weather in Round Island by month
Click on a month below to see detailed weather info for Round Island. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.