Ban Na San in Winter
In winter (December, January and February), Ban Na San sees average daytime highs around 32°C and overnight lows near 22°C, with 243 mm of rain over about 29 wet days across the season. It is the 2nd-warmest season and the driest season of the year.
Over the season highs climb from about 30°C in early December to 34°C by late February. The sky is clear or mostly clear about 22% of the time across winter, and the air most often feels oppressive.
Winter is Ban Na San's best season of the year to visit on our travel score. For the whole year in context, see Ban Na San's year-round climate.
- Avg daytime high
- 32°C
- 2nd-warmest season
- Avg overnight low
- 22°C
- Rainfall
- 243 mm
- 29 wet days
- Avg wind
- 7 km/h
- Travel score
- 4.0
- best season of the year
- Months
- Dec · Jan · Feb
Temperature in Ban Na San in Winter
Over the season highs climb from about 30°C in early December to 34°C by late February.
A typical winter day in Ban Na San reaches about 32°C and drops to 22°C overnight. The warmest of the three months is February, the coolest January.
How winter really feels in Ban Na San
Once humidity and wind are folded in, winter brings about 90 days that feel above 32°C and 0 that feel at or below 0°C.
The story in winter is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Ban Na San weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 32° / 22° | 67 | 8.4 | 11.5 | 4.3 |
| Feb | 34° / 23° | 37 | 5 | 11.7 | 3.5 |
| Mar | 35° / 24° | 110 | 11.2 | 11.9 | 2.5 |
| Apr | 35° / 25° | 161 | 18.7 | 12.2 | 2.0 |
| May | 33° / 25° | 189 | 24.8 | 12.4 | 2.2 |
| Jun | 32° / 24° | 160 | 22.6 | 12.5 | 2.7 |
| Jul | 31° / 24° | 166 | 23.6 | 12.5 | 2.8 |
| Aug | 31° / 24° | 193 | 24.1 | 12.3 | 2.8 |
| Sep | 31° / 24° | 235 | 26.1 | 12.1 | 2.6 |
| Oct | 31° / 24° | 333 | 28.6 | 11.8 | 2.6 |
| Nov | 30° / 23° | 268 | 23.1 | 11.6 | 3.1 |
| Dec | 30° / 23° | 139 | 15.2 | 11.5 | 4.2 |
Cloud cover in Winter
The sky is clear or mostly clear about 22% of the time across winter.
Chance of precipitation in Winter
Ban Na San gets around 243 mm of rain over 29 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 7 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 11 h 30 min in early December to 11 h 48 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 4.9 kWh/m².
Hazard calendar for Ban Na San
In winter, Ban Na San overlaps its cyclone season. The full year is below, with each hazard's peak months called out.
Ban Na San sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.
Is winter a good time to visit Ban Na San?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter 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 Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Ban Na San sees daytime highs around 32°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 29 days see rain.
Sea temperature near Ban Na San in Winter
The nearest coast averages about 28°C across winter — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 28 | 28 | 29 | 30 | 31 | 30 | 30 | 29 | 29 | 29 | 29 | 28 |
| Comfort | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Warm |
| Feb | 28 | Tropical |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 31 | Tropical |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Warm |
UV index in Ban Na San in Winter
Clear-sky midday UV across winter averages 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 13 | 13 | 13 | 12 | 12 | 11 | 13 | 13 | 12 | 10 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 13 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 12 | Extreme |
| Nov | 10 | Extreme |
| Dec | 10 | Very high |
Air quality in Ban Na San in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 19 | 18 | 20 | 21 | 17 | 16 | 16 | 14 | 15 | 15 | 14 | 15 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 19 | Moderate |
| Feb | 18 | Moderate |
| Mar | 20 | Moderate |
| Apr | 21 | Moderate |
| May | 17 | Moderate |
| Jun | 16 | Moderate |
| Jul | 16 | Moderate |
| Aug | 14 | Moderate |
| Sep | 15 | Moderate |
| Oct | 15 | Moderate |
| Nov | 14 | Moderate |
| Dec | 15 | Moderate |
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.
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.
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
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.