Mirissa Temperature by Month
The average annual maximum temperature in Mirissa, Matara District, Sri Lanka is 30°C (86°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Mirissa compares to cities worldwide.
Mirissa Monthly Temperatures
Year-round, Mirissa experiences a consistently very warm climate. Maximum daytime temperatures range from a very warm 31°C (88°F) in March to a comfortable 29°C (84°F) in the coolest month, January. Nighttime temperatures range from 25°C (77°F) in March to 24°C (75°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Mirissa by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. March, the warmest month of the year, receives 270 hours of sunshine.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
37-year average (1980-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in June
Historical Mirissa Temperatures: 1976-2026
Browse day-by-day temperature records for Mirissa spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Mirissa vs Sri Lanka
The map below shows the annual temperature across Sri Lanka. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Mirissa vs World: Temperature Compared
Mirissa's average annual maximum temperature is 30°C (86°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Mirissa's weather — including monthly rainfall, sunshine hours, and humidity — visit our Mirissa climate page.
