Long Mỹ weather in January

In January, Long Mỹ sees average daytime highs of 30°C and overnight lows near 23°C, with 27 mm of rain across 4.8 wet days and about 11.5 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 21% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 11 h 24 min at the start of January to 11 h 36 min by month's end. Set against the rest of the year, January is Long Mỹ's 4th-clearest and 6th-windiest month. For the whole year in context, see Long Mỹ's year-round climate.

Daytime high
30°
11th warmest
Overnight low
23°
1st coldest
Rainfall
27 mm
4.8 wet days
Daylight
11 h 30 min
6:22 AM – 5:52 PM
Cloud cover
65%
4th clearest
Wind
10 km/h
6th windiest
Solar energy
4.91 kWh/m²
Travel score
5.5
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical January day in Long Mỹ reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 32°C. Set against its neighbours, January runs on par with December and about 1°C cooler than February.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13023
23023
33023
43023
53023
63023
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
243023
253023
263023
273023
283023
293023
303023
313023

How January really feels in Long Mỹ

Once humidity and wind are folded in, January 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 January is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Long Mỹ weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°274.811.55.5
Feb31° / 23°132.711.75.1
Mar33° / 25°446.611.93.8
Apr34° / 26°9713.612.22.8
May33° / 26°23126.412.42.2
Jun31° / 25°25927.612.62.4
Jul31° / 25°26629.312.52.5
Aug31° / 25°25929.212.32.5
Sep31° / 25°29628.712.12.4
Oct31° / 24°3232811.82.6
Nov31° / 24°1651911.63.5
Dec30° / 23°8110.411.44.8

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 20% of January, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23664
33664
43763
53862
63862
73961
83961
94060
104060
113961
123961
134060
144060
154060
164060
174060
184060
194159
204159
214159
224159
234258
244258
254357
264357
274357
284456
294555
304654
314753

Chance of precipitation in January

Any precipitation

Long Mỹ gets around 27 mm of rain over 4.8 wet days in January. 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 ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
122
221
320
419
518
618
717
816
916
1016
1115
1215
1315
1415
1515
1615
1716
1816
1916
2016
2116
2216
2315
2415
2514
2614
2713
2813
2912
3012
3111

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the oppressive band about 57% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1230635
2230644
3230644
4231634
5231634
6231634
7232633
8232633
9233623
10234613
11334603
12335593
13336592
14336592
15337582
16338572
17339571
18439561
19440551
20441541
21442531
22442531
23443521
24444511
25544510
26545500
27546490
28546490
29447480
30447480
31447480

Wind in January

Winds average 10 km/h in January.

Across January, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 11 h 24 min at the start of January to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over January. Sunrise moves from 6:18 AM to 6:24 AM, and sunset from 5:44 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.46:185:44
211.46:185:45
311.46:185:45
411.56:195:46
511.56:195:46
611.56:195:47
711.56:205:47
811.56:205:48
911.56:205:48
1011.56:215:49
1111.56:215:49
1211.56:215:50
1311.56:225:50
1411.56:225:51
1511.56:225:51
1611.56:225:52
1711.56:225:52
1811.56:235:53
1911.56:235:53
2011.56:235:54
2111.56:235:54
2211.56:235:55
2311.56:235:55
2411.56:245:55
2511.56:245:56
2611.56:245:56
2711.56:245:57
2811.66:245:57
2911.66:245:57
3011.66:245:58
3111.66:245:58

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.91 kWh/m².

For context, solar energy here swings from a low near 4.11 kWh/m² to a high of 5.94 kWh/m² in March across the year — January's 4.91 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.1Bright
245.1Bright
255.1Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.3Bright
315.3Bright
Planning a trip in January

Hazard calendar for Long Mỹ

In seasonPeak

In January, Long Mỹ sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Long Mỹ sits in the Pacific typhoon belt; the season peaks July–October.

Long Mỹ's rainy season runs May–November, when most of the year's rain falls.

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

Is January a good time to visit Long Mỹ?

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

5.5
Sightseeing
1st-best month of the year
7.5
Beach & pool
2nd-best month of the year

January is a reasonable time to visit Long Mỹ for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Long Mỹ in January

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

In January, Long Mỹ sees daytime highs around 30°C and nights near 23°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Long Mỹ in January

The nearest coast averages about 26°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 62 km away) is warmest in May at about 30°C and coldest in January near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar28Warm
Apr29Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Long Mỹ in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January 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 Long Mỹ peaks around March 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 22UV 13Jan 1UV 10
UV index (midday)Level
Jan10Very high
Feb12Extreme
Mar13Extreme
Apr13Extreme
May13Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep13Extreme
Oct10Extreme
Nov10Very high
Dec10Very high

Air quality in Long Mỹ in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Long Mỹ is worst in December — around 57 µg/m³ PM2.5 (unhealthy), about 2.1× the cleanest month (August, 27 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorUnhealthyDec 1556 µg/m³Aug 1327 µg/m³
PM2.5 (µg/m³)Level
Jan51Poor
Feb40Poor
Mar38Poor
Apr39Poor
May37Poor
Jun32Moderate
Jul30Moderate
Aug27Moderate
Sep35Poor
Oct49Poor
Nov53Poor
Dec57Unhealthy
Location & terrain

Where is Long Mỹ?

Long Mỹ sits at 9.7°N, 105.6°E, 2 m above sea level, in Vietnam. The nearest listed city is Ngã Năm, 13 km away.

Topography around Long Mỹ

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

Within 3 km, the terrain around Long Mỹ 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 18 m; within 80 km, only modest variations in elevation — a maximum elevation change of 206 m.

The land around Long Mỹ is covered by cropland (66%) and trees (22%) within 3 km, cropland (74%) and trees (21%) within 16 km, and cropland (50%), water (25%) and trees (21%) within 80 km.

3 km
11 m
16 km
18 m
80 km
206 m
treesgrasslandcroplandartificial surfaceswatermangroves
January weather nearby: Ngã Năm 13 km · Vị Thanh 16 km · Ấp Một 18 km · Ngã Bảy 31 km · Phú Lộc 34 km · Phong Điền 37 km · Cái Răng 41 km · Thới Lai 43 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 Long Mỹ (9.6814°, 105.5723°, elevation 2 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).