Negombo weather in September 2025

Expect 31°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Negombo in September based on long-term weather averages. There is usually 12 days with some rainfall and 187 mm of average monthly rainfall in September.

  • 31°C maximum daytime temperature in September in Negombo31
    31°C max day temperature
  • 6 hours of sunshine per day
  • 12 days with some rainfall in September in Negombo12
    12 days with some rainfall
  • 25°C minimum night-time temperature in September in Negombo25
    25°C min night temperature
  • 12 hours of daylight per day in September in Negombo12
    12 hours of daylight per day
  • High heat & humidity in September in NegomboH
    High heat & humidity
  • 187 mm monthly rainfall in September in Negombo187
    187 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Negombo11
    11+ (Extreme) UV index
  • 27°C sea temperature in September in Negombo27
    27°C sea temperature

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The September weather guide for Sri Lanka (Negombo) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Sri Lanka

How hot is it in Negombo in September?

Daytime temperatures usually reach 31°C in Negombo in September with high heat and humidity, falling to 25°C at night.

How sunny is it in Negombo in September?

There are normally 6 hours of bright sunshine each day in Negombo in September - that's 51% of daylight hours.

How warm is the sea around Negombo in September?

The average sea temperature around Negombo in September is 27°C.

Does it rain in Negombo in September?

There are usually 12 days with some rain in Negombo in September and the average monthly rainfall is 187mm.

Negombo September sunrise & sunset times

Browse the sunrise and sunset times for Negombo in September 2025. Select a month to view Negombo sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:03 18:18
Monday, 15th September 2025 06:01 18:11
Tuesday, 30th September 2025 05:59 18:02

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