Mariental weather in December

In December, Mariental sees average daytime highs of 35°C and overnight lows near 21°C, with 25 mm of rain across 3.7 wet days and about 13.5 hours of daylight. It is the 1st-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 35°C through the month. The sky is clear or mostly clear about 75% of the time in December, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of December to 13 h 30 min by month's end. Set against the rest of the year, December is Mariental's 9th-clearest and 2nd-windiest month. For the whole year in context, see Mariental's year-round climate.

Daytime high
35°
1st warmest
Overnight low
21°
10th coldest
Rainfall
25 mm
3.7 wet days
Daylight
13 h 30 min
5:59 AM – 7:30 PM
Cloud cover
25%
9th clearest
Wind
14 km/h
2nd windiest
Solar energy
8.54 kWh/m²
Travel score
3.3
out of 10

Mariental is town in Namibia.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 35°C through the month.

A typical December day in Mariental reaches about 35°C in the afternoon and slips back to 21°C overnight — a 14°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 38°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13420
23420
33421
43421
53421
63421
73521
83521
93521
103521
113521
123521
133521
143521
153521
163521
173521
183521
193521
203521
213521
223521
233521
243521
253521
263522
273522
283522
293522
303522
313522

How December really feels in Mariental

Once humidity and wind are folded in, December averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Mariental weather by month

How December compares with the rest of the year at a glance. December is the 1st-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan34° / 22°447.413.43.3
Feb33° / 22°53812.93.7
Mar32° / 20°305.612.24.7
Apr29° / 16°173.411.46.8
May26° / 11°30.610.89.0
Jun23° / 10.310.59.5
Jul23° / 10.310.69.4
Aug25° / 00.111.19.5
Sep29° / 13°20.311.87.4
Oct32° / 17°61.112.65.3
Nov33° / 19°92.113.24.3
Dec35° / 21°253.713.53.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 75% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 12%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18911
28911
38911
48911
58911
68911
78911
88911
99010
10919
11919
12919
13919
14919
15919
16919
179010
189010
199010
208911
218812
228812
238812
248713
258614
268614
278515
288515
298416
308416
318416

Chance of precipitation in December

Any precipitation

Mariental gets around 25 mm of rain over 3.7 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 12% and peaks near 18% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
112
213
313
413
513
612
712
811
911
1011
1110
1210
1310
149
159
169
179
189
199
2010
2110
2211
2312
2413
2514
2615
2715
2816
2917
3017
3118

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 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
188750
288750
388750
488750
588750
688750
788750
889650
989650
1090550
1191540
1290541
1390541
1490541
1590541
1690541
1789542
1889542
1989542
2088543
2188543
2286653
2386653
2484754
2584754
2682765
2781865
2880875
2979876
3078886
3177986

Wind in December

Winds average 14 km/h in December.

Across December, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 24 min at the start of December to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:55 AM to 6:06 AM, and sunset from 7:20 PM to 7:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:557:20
213.45:557:21
313.45:567:22
413.45:567:22
513.55:567:23
613.55:567:24
713.55:567:24
813.55:567:25
913.55:577:26
1013.55:577:26
1113.55:577:27
1213.55:577:28
1313.55:587:28
1413.55:587:29
1513.55:587:29
1613.55:597:30
1713.55:597:30
1813.56:007:31
1913.56:007:31
2013.56:007:32
2113.56:017:32
2213.56:017:33
2313.56:027:33
2413.56:027:34
2513.56:037:34
2613.56:037:35
2713.56:047:35
2813.56:047:36
2913.56:057:36
3013.56:057:36
3113.56:067:37

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 8.54 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.31 kWh/m² to a high of 8.54 kWh/m² in December across the year — December's 8.54 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
18.5Intense
28.5Intense
38.5Intense
48.5Intense
58.5Intense
68.5Intense
78.5Intense
88.5Intense
98.5Intense
108.6Intense
118.6Intense
128.6Intense
138.6Intense
148.6Intense
158.6Intense
168.6Intense
178.6Intense
188.6Intense
198.6Intense
208.6Intense
218.6Intense
228.6Intense
238.6Intense
248.6Intense
258.5Intense
268.5Intense
278.5Intense
288.5Intense
298.4Intense
308.4Intense
318.4Intense
Planning a trip in December

Is December a good time to visit Mariental?

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

3.3
Sightseeing
11th-best month of the year
6.9
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Mariental. The water and warmth also suit a beach or pool day.

What to pack for Mariental in December

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

In December, Mariental sees daytime highs around 35°C and nights near 21°C. Pack light clothes and sun protection. About 4 days see rain.

light clothessun protection

UV index in Mariental in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mariental peaks around January 15 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 5 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 15UV 16Jun 18UV 5
UV index (midday)Level
Jan16Extreme
Feb14Extreme
Mar13Extreme
Apr9Very high
May7High
Jun5High
Jul6High
Aug8Very high
Sep10Extreme
Oct13Extreme
Nov14Extreme
Dec14Extreme

Air quality in Mariental 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 Mariental is worst in December — around 15 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (April, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateDec 1115 µg/m³Apr 189 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb11Good
Mar10Good
Apr9Good
May9Good
Jun12Good
Jul12Moderate
Aug12Moderate
Sep13Moderate
Oct14Moderate
Nov15Moderate
Dec15Moderate
Location & terrain

Where is Mariental?

Mariental sits at 24.6°S, 18.0°E, 0 m above sea level, in Namibia. The nearest listed city is Rehoboth, 171 km away.

RehobothKeetmanshoopWindhoekKatuturaGobabisOkahandjaLüderitzWalvis Bay

Topography around Mariental

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mariental.

Within 3 km, the terrain around Mariental has only modest variations in elevation — a maximum elevation change of 44 m around an average of 1,105 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 150 m; within 80 km, significant variations in elevation — a maximum elevation change of 454 m.

The land around Mariental is covered by bare terrain (35%) and grassland (20%) within 3 km, grassland (52%) and bare terrain (24%) within 16 km, and grassland (71%) within 80 km.

3 km
44 m
16 km
150 m
80 km
454 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwetland
December weather nearby: Rehoboth 171 km · Keetmanshoop 217 km · Windhoek 247 km · Katutura 251 km · Gobabis 263 km · Okahandja 314 km · Lüderitz 360 km · Walvis Bay 398 km

Namibia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / M
220 V · 50 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$4,876
2025
Happiness
4.8 / 10
World Happiness, 2025
Homicide rate
11.2
per 100k, 2021
Road deaths
34.8
per 100k/yr, 2019
Income group
Lower middle
World Bank
Religion
Christian 98%unaffiliated 2%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 Mariental (-24.6271°, 17.9647°, 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. 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).