Temperatures in September
It's hot in September in Negombo with an average temperature of 31°C. Temperatures this month range from a low of 30°C to a high of 31°C. At night, you can expect temperatures between 25°C and 27°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Negombo in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Negombo with hot temperatures, averaging around 31°C during the day and nights close to 26°C. Plenty of days with a chance of precipitation. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-September
By mid-September, the average daytime temperature stays the same at 31°C, with nights close to 27°C. The chance of precipitation is high during this period. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of September
By the end of September, the average daytime temperature in Negombo will be around 31°C, with nights close to 26°C. There’s a significant chance of many days with precipitation. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
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Water temperature
The water temperature at Negombo is 29°C this month. Nice and warm for a swim.
Precipitation in September
In September, there is an average of 354 mm of precipitation, spread over 19 days. The wind speed is around 4 Bft, mostly coming from the Southwest.
The average precipitation chance this month is 64% per day. Though that seems frequent, the weather’s variable. There are also a few days with lower precipitation chances.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Negombo. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Negombo in September |
London | ||
|---|---|---|---|
 Average Temperature |
31°C | 20°C | |
 High Temp |
31°C | 22°C | |
| Low Temp |
30°C | 17°C | |
 Total Precipitation |
354 mm | 44 mm | |
| Rainy Days |
19 days | 8 days | |
August
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.
Is September a good time to visit Negombo?
After some sun? Then September isn’t the best time to be in Negombo. The temperature is pleasant, but there’s too much chance of rain this month.
Temperature records for Negombo in September
With 33°C, Negombo hit the highest temperature in the last 10 years in September 2023. The lowest daytime temperature in this month was 26°C in 2019. The extreme night temperatures ranged from a low of 22°C to a high of 28°C.
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Daily Temperature in September in Negombo
This chart shows the average daily temperatures, both day and night, for each day in September in Negombo, 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 Negombo
The chart below shows the average daily precipitation in September for Negombo, 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 19 days of rain in Negombo.
Daily UV Index in September in Negombo
This chart shows the average daily UV index in September in Negombo, 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 Negombo Over the Years
This chart shows the average temperature in September in Negombo, measured in degrees Celsius, over the past years.
Total Precipitation in September in Negombo Over the Years
This chart shows the average precipitation in September in Negombo, 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 Negombo
Click on a specific day in September for detailed info on the typical weather on that day in Negombo. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Negombo
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Average Weather in Negombo by Month
Click on a month below to see detailed weather info for Negombo. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
