Mirissa Beach weather in September 2025

Expect 29°C 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.

  • 29°C maximum daytime temperature in September in Mirissa Beach29
    29°C max day temperature
  • 6 hours of sunshine per day
  • 11 days with some rainfall in September in Mirissa Beach11
    11 days with some rainfall
  • 24°C minimum night-time temperature in September in Mirissa Beach24
    24°C 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
  • 215 mm monthly rainfall in September in Mirissa Beach215
    215 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Mirissa Beach11
    11+ (Extreme) UV index
  • 28°C sea temperature in September in Mirissa Beach28
    28°C sea temperature

More about Mirissa Beach

Mirissa Beach by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Sri Lanka

TUI: up to 7% off holidays booked online

  • Book online with TUI & save up to 7% on holidays
  • FREE child places available for select holidays
  • Pay £0 deposits with direct debit & spread the cost
Go to TUI deal >>

View all TUI offers

TUITUI deal finder

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 / mm)  |  Imperial (°F / inches)

Back to top

More about Sri Lanka

How hot is it in Mirissa Beach in September?

Daytime temperatures usually reach 29°C in Mirissa Beach in September with high heat and humidity, falling to 24°C 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 28°C.

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 215mm.

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^