Mersa weather in December

In December, Mersa sees average daytime highs of 25°C and overnight lows near 12°C, with 38 mm of rain across 4.7 wet days and about 11.3 hours of daylight. It is the 11th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 64% of the time in December, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of December to 11 h 18 min by month's end. Set against the rest of the year, December is Mersa's 2nd-clearest and 8th-windiest month. For the whole year in context, see Mersa's year-round climate.

Daytime high
25°
11th warmest
Overnight low
12°
1st coldest
Rainfall
38 mm
4.7 wet days
Daylight
11 h 18 min
6:38 AM – 5:57 PM
Cloud cover
30%
2nd clearest
Wind
5 km/h
8th windiest
Solar energy
5.49 kWh/m²
Travel score
8.3
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 25°C through the month.

A typical December day in Mersa reaches about 25°C in the afternoon and slips back to 12°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 27°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12513
22513
32513
42512
52512
62512
72512
82512
92512
102512
112512
122512
132512
142512
152512
162512
172512
182512
192512
202412
212412
222412
232412
242412
252412
262412
272412
282412
292412
302412
312412

Mersa weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 13°699.211.47.4
Feb25° / 14°56811.67.2
Mar27° / 15°13413.811.96.3
Apr28° / 16°9811.712.36.3
May30° / 17°234.112.56.1
Jun31° / 18°30.412.75.5
Jul30° / 18°397.712.65.3
Aug29° / 17°5910.612.45.6
Sep29° / 17°102.812.16.8
Oct27° / 16°132.911.78.0
Nov26° / 13°243.411.58.4
Dec25° / 12°384.711.38.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 64% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 21%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18218
28218
38218
48218
58218
68218
78218
88119
98119
108119
118119
128119
138218
148218
158218
168119
178119
188119
198020
208020
217921
227921
237822
247723
257723
267624
277525
287426
297327
307228
317129

Chance of precipitation in December

Any precipitation

Mersa gets around 38 mm of rain over 4.7 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 16% and peaks near 22% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
113
213
313
413
513
613
713
813
914
1014
1114
1214
1314
1414
1514
1614
1714
1815
1915
2016
2116
2217
2317
2418
2518
2619
2719
2820
2921
3021
3122

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
184151
284151
385150
485150
586140
686140
786140
886140
986140
1086140
1185141
1286131
1386131
1486131
1586131
1687121
1787121
1887121
1987121
2086131
2186131
2286131
2385141
2485141
2584151
2683161
2783161
2883170
2982180
3081190
3180200

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 24 min at the start of December to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:30 AM to 6:45 AM, and sunset from 5:52 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.46:305:52
211.46:315:52
311.46:315:53
411.46:325:53
511.36:325:53
611.36:335:53
711.36:335:54
811.36:345:54
911.36:345:54
1011.36:355:55
1111.36:355:55
1211.36:365:56
1311.36:365:56
1411.36:375:56
1511.36:375:57
1611.36:385:57
1711.36:385:58
1811.36:395:58
1911.36:395:58
2011.36:405:59
2111.36:405:59
2211.36:416:00
2311.36:416:00
2411.36:426:01
2511.36:426:01
2611.36:436:02
2711.36:436:02
2811.36:446:03
2911.36:446:03
3011.36:446:04
3111.36:456:04

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.49 kWh/m².

For context, solar energy here swings from a low near 5.22 kWh/m² to a high of 6.57 kWh/m² in April across the year — December's 5.49 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in December

Hazard calendar for Mersa

In seasonPeak

None of Mersa's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Mersa's rainy season runs March–April, when most of the year's rain falls.

Mersa sees seasonal dust haze (June–August), heaviest in July.

Rainy season
Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Mersa?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

8.3
Sightseeing
2nd-best month of the year
7.3
Beach & pool
7th-best month of the year

December is one of the better times to visit Mersa for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Mersa in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Mersa sees daytime highs around 25°C and nights near 12°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

UV index in Mersa in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 10 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 19UV 15Dec 12UV 10
UV index (midday)Level
Jan12Extreme
Feb13Extreme
Mar15Extreme
Apr14Extreme
May13Extreme
Jun13Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct13Extreme
Nov11Extreme
Dec10Extreme

Air quality in Mersa in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December 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).

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorPoorModerateSep 1038 µg/m³Nov 1826 µg/m³
PM2.5 (µg/m³)Level
Jan29Moderate
Feb30Moderate
Mar32Moderate
Apr28Moderate
May33Moderate
Jun38Poor
Jul34Moderate
Aug37Poor
Sep38Poor
Oct29Moderate
Nov26Moderate
Dec28Moderate
Location & terrain

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.

3 km
451 m
16 km
2,229 m
80 km
3,515 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Weldiya 19 km · Sifra 41 km · Hāyk’ 41 km · Dessie 59 km · Kombolcha 66 km · Batī 66 km · Lalibela 77 km · Alamata 84 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
Ethiopian Orthodox 44%Muslim 31%Protestant 23%other 1%

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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).