Móng Cái weather in December

In December, Móng Cái sees average daytime highs of 19°C and overnight lows near 16°C, with 53 mm of rain across 8.8 wet days and about 10.7 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 18°C by the end. The sky is clear or mostly clear about 36% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 48 min at the start of December to 10 h 42 min by month's end. Set against the rest of the year, December is Móng Cái's 3rd-clearest and 1st-windiest month. For the whole year in context, see Móng Cái's year-round climate.

Daytime high
19°
10th warmest
Overnight low
16°
3rd coldest
Rainfall
53 mm
8.8 wet days
Daylight
10 h 42 min
6:23 AM – 5:05 PM
Cloud cover
56%
3rd clearest
Wind
15 km/h
1st windiest
Solar energy
2.96 kWh/m²
Travel score
6.3
out of 10

Móng Cái is provincial city of Vietnam.

Density
211/km²
people per km²

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 20°C in the first days to 18°C by the end.

A typical December day in Móng Cái reaches about 19°C in the afternoon and slips back to 16°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 22°C. Set against its neighbours, December runs about 4°C cooler than November and about 2°C warmer than January.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12117
22117
32117
42017
52017
62017
72016
82016
92016
101916
111916
121916
131916
141916
151915
161915
171915
181915
191915
201915
211815
221815
231815
241815
251815
261815
271815
281815
291815
301815
311815

How December really feels in Móng Cái

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Móng Cái weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 14°6912.710.85.0
Feb18° / 15°501111.35.4
Mar21° / 18°7413.111.85.7
Apr24° / 22°7112.712.56.2
May28° / 25°20919134.8
Jun30° / 27°28823.513.33.4
Jul30° / 27°3802513.23.2
Aug30° / 27°37424.612.73.3
Sep29° / 26°25318.612.14.3
Oct27° / 24°9910.311.56.7
Nov23° / 20°679.1117.1
Dec19° / 16°538.810.76.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25347
35248
45149
55050
65050
74852
84852
94753
104654
114654
124654
134654
144753
154654
164654
174852
184852
194852
204951
214951
224951
235050
245050
255050
264951
274852
284852
294753
304555
314456

Chance of precipitation in December

Any precipitation

Móng Cái gets around 53 mm of rain over 8.8 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 29% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
131
231
331
431
531
631
731
830
930
1030
1129
1229
1328
1428
1528
1627
1727
1827
1927
2027
2127
2227
2327
2427
2528
2628
2729
2830
2931
3032
3133

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 13% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1352319157
2372318157
3392318146
4402317146
5422316145
6432315145
7452314144
8462314134
9472313133
10492313133
11512212132
12512212132
13532112131
14532112131
15532112131
16542012131
17542013130
18552013120
19552013120
20552014110
21552014110
22552015100
2356201590
2455211590
2555211680
2654211780
2753221780
2853221870
2953221870
3051221980
3151221980

Wind in December

Winds average 15 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 48 min at the start of December to 10 h 42 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 6:14 AM to 6:30 AM, and sunset from 5:01 PM to 5:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.86:145:01
210.86:155:01
310.86:165:02
410.86:165:02
510.76:175:02
610.76:185:02
710.76:185:02
810.76:195:03
910.76:195:03
1010.76:205:03
1110.76:215:03
1210.76:215:04
1310.76:225:04
1410.76:225:04
1510.76:235:05
1610.76:235:05
1710.76:245:06
1810.76:255:06
1910.76:255:06
2010.76:265:07
2110.76:265:07
2210.76:265:08
2310.76:275:08
2410.76:275:09
2510.76:285:09
2610.76:285:10
2710.76:295:10
2810.76:295:11
2910.76:295:11
3010.76:305:12
3110.76:305:12

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.96 kWh/m².

For context, solar energy here swings from a low near 2.69 kWh/m² to a high of 5.1 kWh/m² in May across the year — December's 2.96 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.1Moderate
33.1Moderate
43.1Moderate
53.0Moderate
63.0Moderate
73.0Moderate
83.0Moderate
93.0Moderate
102.9Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.9Moderate
183.0Moderate
193.0Moderate
203.0Moderate
213.0Moderate
223.0Moderate
233.0Moderate
243.0Moderate
253.0Moderate
263.0Moderate
272.9Moderate
282.9Moderate
292.9Moderate
302.9Moderate
312.9Moderate
Planning a trip in December

Hazard calendar for Móng Cái

In seasonPeak

In December, Móng Cái sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Móng Cái sits in the Pacific typhoon belt; the season peaks July–October.

Móng Cái's monsoon runs May–September, when most of the year's rain falls.

Pacific typhoon
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Móng Cái?

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

6.3
Sightseeing
3rd-best month of the year
2.7
Beach & pool
10th-best month of the year

December is a reasonable time to visit Móng Cái for sightseeing.

What to pack for Móng Cái in December

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

In December, Móng Cái sees daytime highs around 19°C and nights near 16°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Móng Cái in December

The nearest coast averages about 21°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 19 km away) is warmest in August at about 30°C and coldest in February near 19°C.

It's comfortable for a long swim from Mar 15 to Dec 30 — about 9.6 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan19Cool
Feb19Cool
Mar20Refreshing
Apr23Refreshing
May27Warm
Jun29Tropical
Jul29Tropical
Aug30Tropical
Sep29Tropical
Oct27Warm
Nov24Warm
Dec21Refreshing

UV index in Móng Cái in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Móng Cái peaks around July 9 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJul 9UV 12Dec 17UV 6
UV index (midday)Level
Jan6High
Feb8Very high
Mar9Very high
Apr8Very high
May10Very high
Jun12Extreme
Jul12Extreme
Aug8Very high
Sep9Very high
Oct9Very high
Nov7High
Dec6High

Air quality in Móng Cái 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 Móng Cái is worst in December — around 46 µg/m³ PM2.5 (poor), about 2.8× the cleanest month (July, 16 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorDec 2346 µg/m³Jul 1416 µg/m³
PM2.5 (µg/m³)Level
Jan45Poor
Feb42Poor
Mar44Poor
Apr38Poor
May25Moderate
Jun17Moderate
Jul16Moderate
Aug18Moderate
Sep25Moderate
Oct32Moderate
Nov35Moderate
Dec46Poor
Location & terrain

Where is Móng Cái?

Móng Cái sits at 21.5°N, 108.0°E, 9 m above sea level, in Vietnam. The nearest listed city is Thị Trấn Đầm Hà, 43 km away.

Cẩm PhảThị Trấn Na DươngHa LongLạng Sơn

Topography around Móng Cái

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

Within 3 km, the terrain around Móng Cái has only modest variations in elevation — a maximum elevation change of 43 m around an average of 8 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 367 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,472 m.

The land around Móng Cái is covered by artificial surfaces (38%) and trees (24%) within 3 km, water (44%) and trees (38%) within 16 km, and trees (53%) and water (40%) within 80 km.

3 km
43 m
16 km
367 m
80 km
1,472 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
December weather nearby: Thị Trấn Đầm Hà 43 km · Thị Trấn Tiên Yên 62 km · Thị Trấn Ba Chẽ 76 km · Cẩm Phả Mines 89 km · Cẩm Phả 92 km · Thị Trấn Na Dương 106 km · Ha Long 112 km · Lạng Sơn 130 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 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 Móng Cái (21.5247°, 107.9662°, 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).