SeasonMapMirissa weather in May
Sri Lanka
May in Mirissa: sweltering, soaked, with clean air — fine if you can take 29 rainy days.
#11 of 12 months in Mirissa · #1070 of 1383 destinations to visit in May · comfort 66/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Mirissa in May
Other months in Mirissa
Mirissa's forum calls February close to ideal — fewer crowds, good weather, and prime whale-watching season, which regulars say runs November through April. Sightings aren't guaranteed (recent reports put the odds around 50%), though dolphins show up far more reliably; tours head out around 6:45am, and regulars say the earliest departure gives the calmest seas and the best shot.
Add your own note from Mirissa's card on the map.
Mirissa climate normals — May
| Daytime high | 30°C / 86°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Feels like (high) | 36°C / 97°F | |
| Sea temperature | 29°C / 84°F | ♨️ bath-warm |
| Rainfall | 293 mm / 11.5 in | ⛈ soaked |
| Rainy days | 29 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 25°C / 78°F | |
| Sunshine | 9.6 h/day | |
| Daylight | 12.4 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Mirissa in May
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Quietschool holidays in 2 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Mirissa's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherMirissa's weather peaks January–March, best around February.
Best weatherFair weatherToughest weather
What's on in Mirissa in May
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Southwest (Yala) monsoon
15 May – 15 Sep · usuallyRiskThe whale boats stop, the bay picks up a heavy shore break and the sand narrows to a strip. Half the beach places board up; the ones that stay open charge a third of the winter rate.
- Season
Wet season
MonsoonRisk29 rainy days and about 293 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of Mirissa — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Mirissa?
Mirissa in May — FAQ
- Is May a good time to visit Mirissa?
- May in Mirissa: sweltering, soaked, with clean air — fine if you can take 29 rainy days. It ranks #11 of 12 months for Mirissa on SeasonMap's comfort score (66/100).
- What is the weather like in Mirissa in May?
- In May, Mirissa averages a daily high of 30°C and a low of 25.8°C, with about 292.6 mm of rain over roughly 28.8 rainy days.
- What is the air quality in Mirissa in May?
- Mirissa has a mean US Air Quality Index of about 43 in May.
Other months in Mirissa
Compare Mirissa in May
Warmer or cooler than Mirissa in May
Similar destinations in South Asia — May
Within 300 km: Nuwara Eliya's Adam's Peak pilgrimage season around 5 Dec – 10 May, and Colombo's Vesak on 30–31 May.