Mirissa Beach weather in September 2025

Expect 84°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Mirissa Beach in September. Check more long-term weather averages for Mirissa Beach in September before you book your next holiday to Sri Lanka in 2025/2026.

  • 84°F maximum daytime temperature in September in Mirissa Beach84
    84°F max day temperature
  • 6 hours of sunshine per day
  • 11 days with some rainfall in September in Mirissa Beach11
    11 days with some rainfall
  • 75°F minimum night-time temperature in September in Mirissa Beach75
    75°F min night temperature
  • 12 hours of daylight per day in September in Mirissa Beach12
    12 hours of daylight per day
  • High heat & humidity in September in Mirissa BeachH
    High heat & humidity
  • 8.5 inches monthly rainfall in September in Mirissa Beach8.5
    8.5 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Mirissa Beach11
    11+ (Extreme) UV index
  • 82°F sea temperature in September in Mirissa Beach82
    82°F sea temperature

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The September weather guide for Sri Lanka (Mirissa Beach) 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)  |  Imperial (°F)

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More about Sri Lanka

How hot is it in Mirissa Beach in September?

Daytime temperatures usually reach 84°F in Mirissa Beach in September with high heat and humidity, falling to 75°F at night.

How sunny is it in Mirissa Beach in September?

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

How warm is the sea around Mirissa Beach in September?

The average sea temperature around Mirissa Beach in September is 82°F.

Does it rain in Mirissa Beach in September?

There are usually 11 days with some rain in Mirissa Beach in September and the average monthly rainfall is 8.5 inches.

Mirissa Beach September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:01 18:15
Monday, 15th September 2025 05:59 18:08
Tuesday, 30th September 2025 05:56 18:00

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