Mersa in Summer
In summer (June, July and August), Mersa sees average daytime highs around 30°C and overnight lows near 18°C, with 101 mm of rain over about 19 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Over the season highs ease from about 31°C in early June to 29°C by late August. The sky is clear or mostly clear about 51% of the time across summer, and the air most often feels dry.
Summer is Mersa's weakest season of the year to visit on our travel score. For the whole year in context, see Mersa's year-round climate.
- Avg daytime high
- 30°C
- warmest season of the year
- Avg overnight low
- 18°C
- Rainfall
- 101 mm
- 19 wet days
- Avg wind
- 7 km/h
- Travel score
- 5.5
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Mersa in Summer
Over the season highs ease from about 31°C in early June to 29°C by late August.
A typical summer day in Mersa reaches about 30°C and drops to 18°C overnight. The warmest of the three months is June, the coolest August.
Mersa 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 | 24° / 13° | 69 | 9.2 | 11.4 | 7.4 |
| Feb | 25° / 14° | 56 | 8 | 11.6 | 7.2 |
| Mar | 27° / 15° | 134 | 13.8 | 11.9 | 6.3 |
| Apr | 28° / 16° | 98 | 11.7 | 12.3 | 6.3 |
| May | 30° / 17° | 23 | 4.1 | 12.5 | 6.1 |
| Jun | 31° / 18° | 3 | 0.4 | 12.7 | 5.5 |
| Jul | 30° / 18° | 39 | 7.7 | 12.6 | 5.3 |
| Aug | 29° / 17° | 59 | 10.6 | 12.4 | 5.6 |
| Sep | 29° / 17° | 10 | 2.8 | 12.1 | 6.8 |
| Oct | 27° / 16° | 13 | 2.9 | 11.7 | 8.0 |
| Nov | 26° / 13° | 24 | 3.4 | 11.5 | 8.4 |
| Dec | 25° / 12° | 38 | 4.7 | 11.3 | 8.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 51% of the time across summer.
Chance of precipitation in Summer
Mersa gets around 101 mm of rain over 19 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 36 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 5.6 kWh/m².
Hazard calendar for Mersa
In summer, Mersa overlaps its dust season. The full year is below, with each hazard's peak months called out.
Mersa's rainy season runs January–January, when most of the year's rain falls.
Mersa sees seasonal dust haze (June–August), heaviest in July.
Is summer a good time to visit Mersa?
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 Mersa for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Mersa in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Mersa sees daytime highs around 30°C and nights near 18°C. Pack light clothes. Worth having: rain gear and sun protection. About 19 days see rain.
UV index in Mersa 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 Mersa peaks around March 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 10 (extreme).
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) | 12 | 13 | 15 | 14 | 13 | 13 | 11 | 13 | 13 | 13 | 11 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 12 | Extreme |
| Feb | 13 | Extreme |
| Mar | 15 | Extreme |
| Apr | 14 | Extreme |
| May | 13 | Extreme |
| Jun | 13 | Extreme |
| Jul | 11 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 13 | Extreme |
| Nov | 11 | Extreme |
| Dec | 10 | Extreme |
Air quality in Mersa 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 Mersa is worst in June — around 38 µg/m³ PM2.5 (poor), 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) | 29 | 30 | 32 | 28 | 33 | 38 | 34 | 37 | 38 | 29 | 26 | 28 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Moderate | Poor | Poor | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 29 | Moderate |
| Feb | 30 | Moderate |
| Mar | 32 | Moderate |
| Apr | 28 | Moderate |
| May | 33 | Moderate |
| Jun | 38 | Poor |
| Jul | 34 | Moderate |
| Aug | 37 | Poor |
| Sep | 38 | Poor |
| Oct | 29 | Moderate |
| Nov | 26 | Moderate |
| Dec | 28 | Moderate |
Where is Mersa?
Mersa sits at 11.7°N, 39.6°E, 1,721 m above sea level, in Ethiopia. The nearest listed city is Weldiya, 19 km away.
Topography around Mersa
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mersa.
Within 3 km, the terrain around Mersa has significant variations in elevation — a maximum elevation change of 451 m around an average of 1,673 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,229 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,515 m.
The land around Mersa is covered by cropland (48%) and shrubs (33%) within 3 km, shrubs (41%) and cropland (37%) within 16 km, and shrubs (36%), cropland (29%) and grassland (28%) within 80 km.
Ethiopia travel facts
- Travel advisory
- Level 3
- Reconsider Travel
- Power plugs
- Type C / E / F / L
- 220 V · 50 Hz
- Prices
- ≈ 37% of US
- price level, 2025
- GDP per capita
- $933
- 2025
- Happiness
- 4.0 / 10
- World Happiness, 2025
- Safe drinking water
- 14%
- of population, 2024
- Homicide rate
- 8.5
- per 100k, 2012
- Road deaths
- 28.2
- per 100k/yr, 2019
- Income group
- Low
- World Bank
- English
- Low
- EF EPI 499
- 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 Mersa (11.6667°, 39.65°, elevation 1,721 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.