Unawatuna weather in September 2025

Expect 29°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Unawatuna in September based on long-term weather averages. There is usually 12 days with some rainfall and 249 mm of average monthly rainfall in September.

  • 29°C maximum daytime temperature in September in Unawatuna29
    29°C max day temperature
  • 6 hours of sunshine per day
  • 12 days with some rainfall in September in Unawatuna12
    12 days with some rainfall
  • 24°C minimum night-time temperature in September in Unawatuna24
    24°C min night temperature
  • 12 hours of daylight per day in September in Unawatuna12
    12 hours of daylight per day
  • High heat & humidity in September in UnawatunaH
    High heat & humidity
  • 249 mm monthly rainfall in September in Unawatuna249
    249 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Unawatuna11
    11+ (Extreme) UV index
  • 28°C sea temperature in September in Unawatuna28
    28°C sea temperature

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The September weather guide for Sri Lanka (Unawatuna) 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 Unawatuna in September?

Daytime temperatures usually reach 29°C in Unawatuna in September with high heat and humidity, falling to 24°C at night.

How sunny is it in Unawatuna in September?

There are normally 6 hours of bright sunshine each day in Unawatuna in September - that's 49% of daylight hours.

How warm is the sea around Unawatuna in September?

The average sea temperature around Unawatuna in September is 28°C.

Does it rain in Unawatuna in September?

There are usually 12 days with some rain in Unawatuna in September and the average monthly rainfall is 249mm.

Unawatuna September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:02 18:16
Monday, 15th September 2025 06:00 18:09
Tuesday, 30th September 2025 05:57 18:01

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