Mannar in Summer
In summer (June, July and August), Mannar sees average daytime highs around 30°C and overnight lows near 27°C, with 80 mm of rain over about 18 wet days across the season. It is the 2nd-warmest season and the driest season of the year.
Across summer, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 9% of the time across summer, and the air most often feels miserable.
Summer is Mannar's 2nd-best season to visit on our travel score. Mannar 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 Mannar's year-round climate.
- Avg daytime high
- 30°C
- 2nd-warmest season
- Avg overnight low
- 27°C
- Rainfall
- 80 mm
- 18 wet days
- Avg wind
- 28 km/h
- Travel score
- 5.0
- 2nd-best season
- Months
- Jun · Jul · Aug
Temperature in Mannar in Summer
Across summer, daytime highs hold fairly steady around 30°C.
A typical summer day in Mannar reaches about 30°C and drops to 27°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Mannar
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.
Mannar 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 | 28° / 24° | 58 | 6.7 | 11.5 | 6.6 |
| Feb | 29° / 24° | 27 | 4.6 | 11.7 | 6.2 |
| Mar | 31° / 25° | 29 | 5.5 | 11.9 | 5.2 |
| Apr | 31° / 27° | 78 | 13.4 | 12.2 | 4.1 |
| May | 31° / 28° | 69 | 9.8 | 12.4 | 4.4 |
| Jun | 31° / 28° | 24 | 5.6 | 12.5 | 4.9 |
| Jul | 30° / 27° | 23 | 5.8 | 12.5 | 5.0 |
| Aug | 30° / 27° | 33 | 6.8 | 12.3 | 5.0 |
| Sep | 30° / 27° | 56 | 9.8 | 12.1 | 4.8 |
| Oct | 29° / 26° | 186 | 20.5 | 11.8 | 3.9 |
| Nov | 28° / 25° | 247 | 22.2 | 11.6 | 4.1 |
| Dec | 28° / 24° | 151 | 15.3 | 11.5 | 5.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 9% of the time across summer.
Chance of precipitation in Summer
Mannar gets around 80 mm of rain over 18 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 28 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 30 min in early June to 12 h 12 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 5.9 kWh/m².
Hazard calendar for Mannar
In summer, Mannar overlaps its cyclone season. The full year is below, with each hazard's peak months called out.
Mannar sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.
Mannar's monsoon runs October–December, when most of the year's rain falls.
Is summer a good time to visit Mannar?
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 reasonable time to visit Mannar for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Mannar in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Mannar sees daytime highs around 30°C and nights near 27°C. Pack light clothes and a windbreaker. Worth having: sun protection. About 18 days see rain.
Sea temperature near Mannar 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 at the nearest coast (about 13 km away) is warmest in April at about 30°C and coldest in January near 27°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) | 27 | 28 | 29 | 30 | 30 | 29 | 28 | 28 | 28 | 29 | 29 | 28 |
| Comfort | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 28 | Warm |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 30 | Tropical |
| Jun | 29 | Tropical |
| Jul | 28 | Tropical |
| Aug | 28 | Tropical |
| Sep | 28 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Warm |
UV index in Mannar 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 Mannar peaks around April 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 9 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 | 12 | 13 | 13 | 13 | 11 | 12 | 13 | 12 | 12 | 11 | 9 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 9 | Very high |
| Feb | 12 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 13 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 11 | Extreme |
| Dec | 9 | Very high |
Air quality in Mannar 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 Mannar is worst in May — around 24 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 20 | 19 | 21 | 22 | 24 | 18 | 17 | 18 | 16 | 18 | 18 | 19 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 20 | Moderate |
| Feb | 19 | Moderate |
| Mar | 21 | Moderate |
| Apr | 22 | Moderate |
| May | 24 | Moderate |
| Jun | 18 | Moderate |
| Jul | 17 | Moderate |
| Aug | 18 | Moderate |
| Sep | 16 | Moderate |
| Oct | 18 | Moderate |
| Nov | 18 | Moderate |
| Dec | 19 | Moderate |
Where is Mannar?
Mannar sits at 9.0°N, 79.9°E, 9 m above sea level, in Sri Lanka. The nearest listed city is Vavuniya, 73 km away.
Topography around Mannar
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mannar.
Within 3 km, the terrain around Mannar has only modest variations in elevation — a maximum elevation change of 11 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 13 m; within 80 km, only modest variations in elevation — a maximum elevation change of 174 m.
The land around Mannar is covered by water (39%) and trees (24%) within 3 km, water (73%) within 16 km, and water (56%) and trees (33%) 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 Mannar (8.9894°, 79.8784°, elevation 9 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.