December in Mirissa averages 29C by day and 23C at night, with 185 mm of rain over about 23 wet days. It is the 6th wettest month of the year. Holiday celebrations create a festive atmosphere but drive up prices significantly.
What to Expect
| Detail | Info |
|---|---|
| Temperature | 29C by day, 23C at night |
| Rainfall | 185 mm, about 23 wet days |
Averages for 2015 to 2024 from the Open-Meteo weather archive.
Events and Festivals
- Christmas celebrations
- New Year preparations
- Full moon Poya day
What to Do This Season
- Prime whale watching conditions
- Perfect beach weather
- Festive atmosphere
What to Watch Out For
- Book everything well ahead
- Prices spike for holidays
- Very crowded beaches
What to Wear
Summer beach clothing, dressy options for celebrations
Is It Worth Visiting Now?
Yes - peak season begins with excellent weather
More on Mirissa
Flexible on dates? Compare Mirissa in November and Mirissa in January. The best time to visit Mirissa sets all twelve months side by side. For what is open and worth it, see the things to do in Mirissa. The main Mirissa page covers costs and transport.
We plan trips to Mirissa and the rest of Sri Lanka. Tell us your dates and we will put a route together. Our routes are on the tours page.