Ban Na San weather in January

In January, Ban Na San sees average daytime highs of 32°C and overnight lows near 22°C, with 67 mm of rain across 8.4 wet days and about 11.5 hours of daylight. It is the 6th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 31°C in the first days to 32°C by the end. The sky is clear or mostly clear about 23% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 11 h 30 min at the start of January to 11 h 36 min by month's end. Set against the rest of the year, January is Ban Na San's 3rd-clearest and 5th-windiest month. For the whole year in context, see Ban Na San's year-round climate.

Daytime high
32°
6th warmest
Overnight low
22°
1st coldest
Rainfall
67 mm
8.4 wet days
Daylight
11 h 30 min
6:46 AM – 6:18 PM
Cloud cover
64%
3rd clearest
Wind
6 km/h
5th windiest
Solar energy
4.84 kWh/m²
Travel score
4.3
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 31°C in the first days to 32°C by the end.

A typical January day in Ban Na San reaches about 32°C in the afternoon and slips back to 22°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 34°C. Set against its neighbours, January runs about 2°C warmer than December and about 2°C cooler than February.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13122
23122
33122
43122
53122
63122
73122
83122
93122
103122
113122
123122
133122
143122
153222
163222
173222
183222
193222
203222
213222
223222
233222
243222
253222
263222
273222
283222
293222
303322
313322

How January really feels in Ban Na San

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.

Ban Na San weather by month

How January compares with the rest of the year at a glance. January is the 6th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 22°678.411.54.3
Feb34° / 23°37511.73.5
Mar35° / 24°11011.211.92.5
Apr35° / 25°16118.712.22.0
May33° / 25°18924.812.42.2
Jun32° / 24°16022.612.52.7
Jul31° / 24°16623.612.52.8
Aug31° / 24°19324.112.32.8
Sep31° / 24°23526.112.12.6
Oct31° / 24°33328.611.82.6
Nov30° / 23°26823.111.63.1
Dec30° / 23°13915.211.54.2

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 21% of January, with mostly cloudy or overcast conditions the remaining 57%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
23862
33961
44060
54060
64060
74060
84060
94159
104258
114159
124159
134159
144258
154258
164258
174258
184357
194456
204456
214456
224555
234555
244654
254654
264753
274852
284852
294951
305050
315149

Chance of precipitation in January

Any precipitation

Ban Na San gets around 67 mm of rain over 8.4 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 27% and peaks near 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
234
333
432
532
631
730
829
928
1027
1127
1226
1326
1426
1526
1626
1726
1826
1927
2027
2127
2227
2326
2426
2526
2625
2725
2824
2923
3023
3122

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 70% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1116749
2116749
3116749
4016768
5016768
6016768
7016768
8016777
9016777
10017767
11017767
12018757
13018766
14019756
15020746
16021736
17022726
18023716
19023716
20024706
21025696
22026686
23127666
24128656
25129646
26130636
27131626
28231616
29232615
30233605
31234595

Wind in January

Winds average 6 km/h in January.

Across January, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 11 h 30 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 6 minutes over January. Sunrise moves from 6:41 AM to 6:47 AM, and sunset from 6:11 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:416:11
211.56:416:11
311.56:426:12
411.56:426:12
511.56:426:13
611.56:436:13
711.56:436:14
811.56:436:14
911.56:446:15
1011.56:446:15
1111.56:446:16
1211.56:456:16
1311.56:456:17
1411.56:456:17
1511.56:456:18
1611.56:466:18
1711.56:466:18
1811.56:466:19
1911.66:466:19
2011.66:466:20
2111.66:476:20
2211.66:476:21
2311.66:476:21
2411.66:476:22
2511.66:476:22
2611.66:476:22
2711.66:476:23
2811.66:476:23
2911.66:476:24
3011.66:476:24
3111.66:476:24

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.84 kWh/m².

For context, solar energy here swings from a low near 4.01 kWh/m² to a high of 6.05 kWh/m² in March across the year — January's 4.84 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.6Bright
64.6Bright
74.6Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.9Bright
174.9Bright
184.9Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.1Bright
255.1Bright
265.1Bright
275.2Bright
285.2Bright
295.2Bright
305.3Bright
315.3Bright
Planning a trip in January

Hazard calendar for Ban Na San

In seasonPeak

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

Ban Na San sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

Cyclone
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Ban Na San?

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

4.3
Sightseeing
1st-best month of the year
6.6
Beach & pool
1st-best month of the year

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

What to pack for Ban Na San in January

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

In January, Ban Na San sees daytime highs around 32°C and nights near 22°C. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

Sea temperature near Ban Na San in January

The nearest coast averages about 28°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 64 km away) is warmest in May at about 31°C and coldest in January near 28°C.

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

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Warm
Feb28Tropical
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul30Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Ban Na San in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ban Na San peaks around August 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeAug 22UV 13Dec 15UV 10
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct12Extreme
Nov10Extreme
Dec10Very high

Air quality in Ban Na San 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 Ban Na San is worst in April — around 21 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1021 µg/m³Aug 2014 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb18Moderate
Mar20Moderate
Apr21Moderate
May17Moderate
Jun16Moderate
Jul16Moderate
Aug14Moderate
Sep15Moderate
Oct15Moderate
Nov14Moderate
Dec15Moderate
Location & terrain

Where is Ban Na San?

Ban Na San sits at 8.8°N, 99.4°E, 40 m above sea level, in Thailand. The nearest listed city is Tha Kham, 37 km away.

KrabiKo SamuiAo Nang

Topography around Ban Na San

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

Within 3 km, the terrain around Ban Na San has significant variations in elevation — a maximum elevation change of 257 m around an average of 55 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,544 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,784 m.

The land around Ban Na San is covered by trees (85%) within 3 km, trees (89%) within 16 km, and trees (82%) within 80 km.

3 km
257 m
16 km
1,544 m
80 km
1,784 m
treesgrasslandcroplandartificial surfaceswatermangroves
January weather nearby: Tha Kham 37 km · Surat Thani 38 km · Nakhon Si Thammarat 78 km · Thung Song 79 km · Ron Phibun 88 km · Krabi 95 km · Ko Samui 103 km · Ao Nang 104 km

Thailand travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C
230 V · 50 Hz
Prices
≈ 31% of US
price level, 2025
GDP per capita
$8,057
2025
Happiness
6.3 / 10
World Happiness, 2025
Homicide rate
4.8
per 100k, 2011
Road deaths
32.2
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 402
Religion
Buddhist 93%Muslim 5%Christian 1%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 Ban Na San (8.8004°, 99.3637°, elevation 40 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).