The weather in September in Negombo

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.

Looking for sun? September isn’t a good month to be in Negombo. 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 Negombo, 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 33°C in 2023, Negombo 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 22°C to a highest value of 28°C.

Water temperature

The water temperature at Negombo is 29°C this month. Nice and warm for a swim.

Rainfall amount

In September, there is an average of 354 mm of precipitation, spread over 27 days. The wind speed is around 4 Bft, mostly coming from the Southwest.

Daily weather in September for Negombo

Click on any day in September to get detailed info about the usual weather on that day in Negombo. Check out the historical temperatures and precipitation over the past 10 years on this day.

1

30° / 26°

2

31° / 25°

3

30° / 26°

4

30° / 25°

5

30° / 25°

6

31° / 26°

7

30° / 26°

8

30° / 26°

9

31° / 26°

10

31° / 26°

11

31° / 26°

12

30° / 26°

13

31° / 26°

14

31° / 26°

15

31° / 26°

16

31° / 26°

17

31° / 27°

18

31° / 27°

19

31° / 27°

20

31° / 27°

21

31° / 26°

22

31° / 26°

23

31° / 26°

24

31° / 26°

25

30° / 26°

26

31° / 25°

27

31° / 25°

28

31° / 25°

29

31° / 25°

30

30° / 25°

Start of September

The month of September starts in Negombo with hot temps, averaging around 31°C during the day and nights around 26°C.

Mid September

By mid-September, daytime temps stay steady at around 31°C, with nights around 27°C. There’s a high chance of precipitation during this time.

End of September

By the end of September, the average daytime temperature in Negombo is around 31°C, while nighttime temps are about 26°C. There’s a significant chance of many days with precipitation.

Find affordable trips to Negombo

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 Negombo for all months and discover the best travel time

Temperature charts

These charts show the average temperatures in September in Negombo, 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 Negombo

Temperature in September in Negombo over the years

Precipitation charts

These charts show the average amount of precipitation in September in Negombo, 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 Negombo

Total precipitation in September in Negombo over the years

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.

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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.