Nan weather in January

In January, Nan sees average daytime highs of 30°C and overnight lows near 16°C, with 15 mm of rain across 2 wet days and about 11 hours of daylight. It is the 11th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 29°C in the first days to 31°C by the end. The sky is clear or mostly clear about 69% of the time in January, and the air most often feels humid.

Daylight stretches from about 10 h 54 min at the start of January to 11 h 06 min by month's end. Set against the rest of the year, January is Nan's 3rd-clearest and 8th-windiest month. For the whole year in context, see Nan's year-round climate.

Daytime high
30°
11th warmest
Overnight low
16°
1st coldest
Rainfall
15 mm
2 wet days
Daylight
11 hours
6:57 AM – 5:56 PM
Cloud cover
31%
3rd clearest
Wind
4 km/h
8th windiest
Solar energy
4.64 kWh/m²
Travel score
6.4
out of 10

Nan is town in Nan province, Thailand.

Air quality
High
PM2.5 29.5 µg/m³ · 2019

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 29°C in the first days to 31°C by the end.

A typical January day in Nan reaches about 30°C in the afternoon and slips back to 16°C overnight — a 14°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 33°C. Set against its neighbours, January runs on par with December and about 3°C cooler than February.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12916
22916
32916
42916
52916
62916
72916
82916
93016
103016
113016
123016
133016
143016
153016
163016
173016
183016
193016
203016
213016
223016
233016
243016
253116
263116
273116
283116
293116
303116
313116

How January really feels in Nan

Once humidity and wind are folded in, January 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

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

Nan weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 16°152116.4
Feb33° / 17°81.211.44.7
Mar35° / 20°304.611.92.9
Apr36° / 24°7811.612.42.2
May34° / 25°16621.512.92.3
Jun32° / 25°19023.413.12.5
Jul31° / 25°27326.5132.6
Aug31° / 24°31228.112.62.6
Sep31° / 24°22124.412.12.8
Oct31° / 23°7413.811.64.1
Nov31° / 20°223.511.15.4
Dec29° / 17°141.710.96.6

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 69% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 16%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17921
27921
37921
47921
57921
67921
77921
88020
98119
108119
118218
128218
138317
148317
158515
168515
178614
188614
198614
208713
218713
228713
238713
248713
258713
268713
278713
288713
298614
308713
318713

Chance of precipitation in January

Any precipitation

Nan gets around 15 mm of rain over 2 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 6% and peaks near 8% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
18
28
38
48
58
68
78
88
98
108
118
127
137
146
156
165
175
184
194
204
214
224
234
244
254
264
275
285
295
305
315

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the humid band about 43% 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 (%)
1103442131
293443131
383544121
483444122
573445122
673445122
773545112
873545112
973545112
1073545112
1173645102
1273645102
1383644102
1483744102
1583744102
1683743101
1793743101
1893742101
1993742111
20103742111
21103742111
22103742111
23103642111
24103642111
25103542121
26113542121
27113442121
28113442121
29123442121
30123442111
31123442111

Wind in January

Winds average 4 km/h in January.

Across January, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 10 h 54 min at the start of January to 11 h 06 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 6:53 AM to 6:56 AM, and sunset from 5:47 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.96:535:47
210.96:545:47
310.96:545:48
410.96:545:48
510.96:555:49
610.96:555:50
710.96:555:50
810.96:555:51
910.96:565:51
1010.96:565:52
1110.96:565:53
1211.06:565:53
1311.06:565:54
1411.06:565:54
1511.06:575:55
1611.06:575:56
1711.06:575:56
1811.06:575:57
1911.06:575:58
2011.06:575:58
2111.06:575:59
2211.06:575:59
2311.16:576:00
2411.16:576:01
2511.16:576:01
2611.16:576:02
2711.16:566:02
2811.16:566:03
2911.16:566:04
3011.16:566:04
3111.16:566:05

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.64 kWh/m².

For context, solar energy here swings from a low near 3.85 kWh/m² to a high of 6.22 kWh/m² in April across the year — January's 4.64 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
305.0Bright
315.0Bright
Planning a trip in January

Hazard calendar for Nan

In seasonPeak

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

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

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

Is January a good time to visit Nan?

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

6.4
Sightseeing
2nd-best month of the year
8.7
Beach & pool
2nd-best month of the year

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

What to pack for Nan in January

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

In January, Nan sees daytime highs around 30°C and nights near 16°C. Pack light clothes. Worth having: sun protection.

light clothessun protection

UV index in Nan in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Nan peaks around August 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 12UV 13Dec 17UV 7
UV index (midday)Level
Jan8Very high
Feb9Very high
Mar9Very high
Apr10Very high
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Nan 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 Nan is worst in March — around 71 µg/m³ PM2.5 (unhealthy), about 4.2× the cleanest month (September, 17 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Nan's WHO annual average of 29.5 µg/m³.

020406080JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorUnhealthyModerateMar 2270 µg/m³Sep 1517 µg/m³
PM2.5 (µg/m³)Level
Jan27Moderate
Feb39Poor
Mar71Unhealthy
Apr65Unhealthy
May28Moderate
Jun17Moderate
Jul17Moderate
Aug17Moderate
Sep17Moderate
Oct17Moderate
Nov18Moderate
Dec21Moderate
Location & terrain

Where is Nan?

Nan sits at 18.8°N, 100.8°E, 205 m above sea level, in Thailand. The nearest listed city is Dok Kham Tai, 93 km away.

Dok Kham TaiPhraePhayaoDen ChaiLampangUttaraditChiang RaiBan Houakhoua

Topography around Nan

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

Within 3 km, the terrain around Nan has only modest variations in elevation — a maximum elevation change of 61 m around an average of 208 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 478 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,915 m.

The land around Nan is covered by trees (39%), artificial surfaces (28%) and cropland (21%) within 3 km, trees (76%) within 16 km, and trees (87%) within 80 km.

3 km
61 m
16 km
478 m
80 km
1,915 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Dok Kham Tai 93 km · Phrae 98 km · Phayao 105 km · Den Chai 117 km · Lampang 146 km · Uttaradit 148 km · Chiang Rai 160 km · Ban Houakhoua 166 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 Nan (18.7838°, 100.779°, elevation 205 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).