Mirissa in Summer
In summer (June, July and August), Mirissa sees average daytime highs around 29°C and overnight lows near 25°C, with 498 mm of rain over about 80 wet days across the season. It is the coldest season of the year and the 3rd-wettest season.
Across summer, daytime highs hold fairly steady around 29°C. The sky is clear or mostly clear about 4% of the time across summer, and the air most often feels miserable.
Summer is Mirissa's 2nd-best season to visit on our travel score. Mirissa has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Mirissa's year-round climate.
- Avg daytime high
- 29°C
- coldest season of the year
- Avg overnight low
- 25°C
- Rainfall
- 498 mm
- 80 wet days
- Avg wind
- 19 km/h
- Travel score
- 3.4
- 2nd-best season
- Months
- Jun · Jul · Aug
Temperature in Mirissa in Summer
Across summer, daytime highs hold fairly steady around 29°C.
A typical summer day in Mirissa reaches about 29°C and drops to 25°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Mirissa
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Mirissa weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 29° / 24° | 99 | 14.6 | 11.7 | 4.7 |
| Feb | 30° / 24° | 84 | 13.1 | 11.8 | 4.4 |
| Mar | 31° / 25° | 103 | 18.7 | 12 | 3.8 |
| Apr | 30° / 25° | 189 | 25.7 | 12.1 | 3.1 |
| May | 29° / 26° | 221 | 28.1 | 12.3 | 3.0 |
| Jun | 29° / 25° | 187 | 26.8 | 12.3 | 3.2 |
| Jul | 28° / 25° | 153 | 26.5 | 12.3 | 3.5 |
| Aug | 28° / 25° | 158 | 26.8 | 12.2 | 3.5 |
| Sep | 29° / 25° | 202 | 26.3 | 12 | 3.4 |
| Oct | 29° / 24° | 251 | 26.5 | 11.9 | 3.4 |
| Nov | 29° / 24° | 298 | 25.1 | 11.7 | 3.4 |
| Dec | 29° / 24° | 200 | 21.4 | 11.7 | 4.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 4% of the time across summer.
Chance of precipitation in Summer
Mirissa gets around 498 mm of rain over 80 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 19 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 18 min in early June to 12 h 06 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.5 kWh/m².
Hazard calendar for Mirissa
In summer, Mirissa overlaps its cyclone season. The full year is below, with each hazard's peak months called out.
Mirissa sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.
Is summer a good time to visit Mirissa?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Mirissa.
What to pack for Mirissa in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Mirissa sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection and a windbreaker. About 80 days see rain.
Sea temperature near Mirissa in Summer
The nearest coast averages about 28°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in April at about 30°C and coldest in July near 28°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 28 | 28 | 29 | 30 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 28 |
| Comfort | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Warm |
| Feb | 28 | Tropical |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 29 | Tropical |
| Jun | 28 | Tropical |
| Jul | 28 | Warm |
| Aug | 28 | Warm |
| Sep | 28 | Warm |
| Oct | 28 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Tropical |
UV index in Mirissa in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Mirissa peaks around April 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 at about 9 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 9 | 14 | 12 | 14 | 13 | 11 | 11 | 13 | 13 | 13 | 11 | 10 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 9 | Very high |
| Feb | 14 | Extreme |
| Mar | 12 | Extreme |
| Apr | 14 | Extreme |
| May | 13 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 13 | Extreme |
| Nov | 11 | Extreme |
| Dec | 10 | Very high |
Air quality in Mirissa in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Mirissa is worst in January — around 35 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (September, 16 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 35 | 31 | 25 | 21 | 20 | 18 | 17 | 17 | 16 | 18 | 25 | 30 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 35 | Moderate |
| Feb | 31 | Moderate |
| Mar | 25 | Moderate |
| Apr | 21 | Moderate |
| May | 20 | Moderate |
| Jun | 18 | Moderate |
| Jul | 17 | Moderate |
| Aug | 17 | Moderate |
| Sep | 16 | Moderate |
| Oct | 18 | Moderate |
| Nov | 25 | Moderate |
| Dec | 30 | Moderate |
Where is Mirissa?
Mirissa sits at 5.9°N, 80.5°E, 0 m above sea level, in Sri Lanka. The nearest listed city is Weligama, 4.0 km away.
Topography around Mirissa
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mirissa.
Within 3 km, the terrain around Mirissa has only modest variations in elevation — a maximum elevation change of 57 m around an average of 5 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 291 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,507 m.
The land around Mirissa is covered by water (60%) and trees (34%) within 3 km, water (54%) and trees (37%) within 16 km, and trees (52%) and water (44%) within 80 km.
Sri Lanka travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G / M
- 230 V · 50 Hz
- Prices
- ≈ 27% of US
- price level, 2025
- GDP per capita
- $5,002
- 2025
- Happiness
- 4.0 / 10
- World Happiness, 2025
- Safe drinking water
- 47%
- of population, 2024
- Homicide rate
- 3.3
- per 100k, 2019
- Road deaths
- 19.7
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 486
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mirissa (5.9466°, 80.4583°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.