Sa Dec weather in January

In January, Sa Dec sees average daytime highs of 30°C and overnight lows near 23°C, with 28 mm of rain across 4.3 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 22% 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 30 min by month's end. Set against the rest of the year, January is Sa Dec's 4th-clearest and 9th-windiest month. For the whole year in context, see Sa Dec's year-round climate.

Daytime high
30°
11th warmest
Overnight low
23°
1st coldest
Rainfall
28 mm
4.3 wet days
Daylight
11 h 30 min
6:23 AM – 5:50 PM
Cloud cover
63%
4th clearest
Wind
8 km/h
9th windiest
Solar energy
5 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 Sa Dec 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 Sa Dec

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.

Sa Dec 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°284.311.55.5
Feb31° / 23°102.111.75.1
Mar33° / 25°335.311.93.9
Apr34° / 26°7611.712.22.9
May33° / 26°19624.912.52.2
Jun32° / 26°23926.412.62.4
Jul31° / 25°23527.912.52.5
Aug31° / 25°24228.312.32.5
Sep31° / 25°26728.212.12.4
Oct31° / 25°27827.311.82.6
Nov31° / 24°13517.311.53.6
Dec30° / 23°669.311.44.8

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 22% of January, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
23961
34159
44258
54258
64258
74357
84357
94456
104456
114456
124357
134456
144456
154357
164456
174456
184456
194456
204456
214456
224555
234555
244555
254654
264753
274852
284852
294951
304951
315050

Chance of precipitation in January

Any precipitation

Sa Dec gets around 28 mm of rain over 4.3 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 14% and peaks near 20% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
120
219
318
417
516
615
715
814
914
1013
1113
1213
1313
1413
1514
1614
1714
1814
1915
2015
2115
2215
2315
2414
2514
2613
2713
2812
2912
3011
3110

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 62% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1326638
2326647
3326647
4326656
5326656
6326665
7326665
8326665
9327664
10327664
11327664
12328654
13329644
14329644
15330643
16330643
17331633
18332623
19332623
20333613
21334594
22334594
23335584
24435574
25436564
26436564
27437554
28437554
29438544
30438553
31338563

Wind in January

Winds average 8 km/h in January.

Across January, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 11 h 24 min at the start of January to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over January. Sunrise moves from 6:18 AM to 6:24 AM, and sunset from 5:42 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.46:185:42
211.46:185:43
311.46:195:43
411.46:195:44
511.46:195:44
611.46:205:45
711.46:205:45
811.46:205:46
911.46:215:46
1011.46:215:47
1111.46:215:48
1211.46:225:48
1311.46:225:49
1411.46:225:49
1511.56:225:50
1611.56:235:50
1711.56:235:51
1811.56:235:51
1911.56:235:51
2011.56:235:52
2111.56:235:52
2211.56:235:53
2311.56:245:53
2411.56:245:54
2511.56:245:54
2611.56:245:55
2711.56:245:55
2811.56:245:55
2911.56:245:56
3011.56:245:56
3111.56:245:57

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5 kWh/m².

For context, solar energy here swings from a low near 4.23 kWh/m² to a high of 5.99 kWh/m² in March across the year — January's 5 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.4Bright
Planning a trip in January

Hazard calendar for Sa Dec

In seasonPeak

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

Sa Dec sits in the Pacific typhoon belt; the season peaks July–October.

Sa Dec'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 Sa Dec?

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 Sa Dec for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Sa Dec in January

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

In January, Sa Dec sees daytime highs around 30°C and nights near 23°C. Pack light clothes. Worth having: sun protection. About 4 days see rain.

light clothessun protection

UV index in Sa Dec 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 Sa Dec peaks around August 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 11 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highAug 22UV 13Dec 11UV 9
UV index (midday)Level
Jan10Very high
Feb11Extreme
Mar13Extreme
Apr12Extreme
May12Extreme
Jun11Extreme
Jul12Extreme
Aug13Extreme
Sep13Extreme
Oct9Very high
Nov9Very high
Dec9Very high

Air quality in Sa Dec 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 Sa Dec is worst in January — around 72 µg/m³ PM2.5 (unhealthy), about 2.4× the cleanest month (August, 30 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyJan 1172 µg/m³Aug 1331 µg/m³
PM2.5 (µg/m³)Level
Jan72Unhealthy
Feb59Unhealthy
Mar53Poor
Apr53Poor
May47Poor
Jun38Poor
Jul34Moderate
Aug30Moderate
Sep40Poor
Oct56Unhealthy
Nov68Unhealthy
Dec70Unhealthy
Location & terrain

Where is Sa Dec?

Sa Dec sits at 10.3°N, 105.8°E, 1 m above sea level, in Vietnam. The nearest listed city is Quận Đức Thịnh, 3.0 km away.

Topography around Sa Dec

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

Within 3 km, the terrain around Sa Dec has only modest variations in elevation — a maximum elevation change of 10 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 16 m; within 80 km, only modest variations in elevation — a maximum elevation change of 210 m.

The land around Sa Dec is covered by trees (31%), artificial surfaces (29%) and cropland (21%) within 3 km, trees (45%) and cropland (40%) within 16 km, and cropland (63%) and trees (30%) within 80 km.

3 km
10 m
16 km
16 m
80 km
210 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Quận Đức Thịnh 3.0 km · Lai Vung 18 km · Cao Lãnh 23 km · Vĩnh Long 24 km · Bình Thủy 24 km · Thốt Nốt 24 km · Ô Môn 25 km · Bình Minh 26 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 Sa Dec (10.2909°, 105.7563°, elevation 1 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). 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).