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
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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 33 | 33 |
| Avg low (°C) | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 31 | 22 |
| 2 | 31 | 22 |
| 3 | 31 | 22 |
| 4 | 31 | 22 |
| 5 | 31 | 22 |
| 6 | 31 | 22 |
| 7 | 31 | 22 |
| 8 | 31 | 22 |
| 9 | 31 | 22 |
| 10 | 31 | 22 |
| 11 | 31 | 22 |
| 12 | 31 | 22 |
| 13 | 31 | 22 |
| 14 | 31 | 22 |
| 15 | 32 | 22 |
| 16 | 32 | 22 |
| 17 | 32 | 22 |
| 18 | 32 | 22 |
| 19 | 32 | 22 |
| 20 | 32 | 22 |
| 21 | 32 | 22 |
| 22 | 32 | 22 |
| 23 | 32 | 22 |
| 24 | 32 | 22 |
| 25 | 32 | 22 |
| 26 | 32 | 22 |
| 27 | 32 | 22 |
| 28 | 32 | 22 |
| 29 | 32 | 22 |
| 30 | 33 | 22 |
| 31 | 33 | 22 |
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.
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.
| 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 January
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%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 37 | 38 | 39 | 40 | 40 | 40 | 40 | 40 | 41 | 42 | 41 | 41 | 41 | 42 | 42 | 42 | 42 | 43 | 44 | 44 | 44 | 45 | 45 | 46 | 46 | 47 | 48 | 48 | 49 | 50 | 51 |
| Cloudier (%) | 63 | 62 | 61 | 60 | 60 | 60 | 60 | 60 | 59 | 58 | 59 | 59 | 59 | 58 | 58 | 58 | 58 | 57 | 56 | 56 | 56 | 55 | 55 | 54 | 54 | 53 | 52 | 52 | 51 | 50 | 49 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 37 | 63 |
| 2 | 38 | 62 |
| 3 | 39 | 61 |
| 4 | 40 | 60 |
| 5 | 40 | 60 |
| 6 | 40 | 60 |
| 7 | 40 | 60 |
| 8 | 40 | 60 |
| 9 | 41 | 59 |
| 10 | 42 | 58 |
| 11 | 41 | 59 |
| 12 | 41 | 59 |
| 13 | 41 | 59 |
| 14 | 42 | 58 |
| 15 | 42 | 58 |
| 16 | 42 | 58 |
| 17 | 42 | 58 |
| 18 | 43 | 57 |
| 19 | 44 | 56 |
| 20 | 44 | 56 |
| 21 | 44 | 56 |
| 22 | 45 | 55 |
| 23 | 45 | 55 |
| 24 | 46 | 54 |
| 25 | 46 | 54 |
| 26 | 47 | 53 |
| 27 | 48 | 52 |
| 28 | 48 | 52 |
| 29 | 49 | 51 |
| 30 | 50 | 50 |
| 31 | 51 | 49 |
Chance of precipitation in January
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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 35 | 34 | 33 | 32 | 32 | 31 | 30 | 29 | 28 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 25 | 25 | 24 | 23 | 23 | 22 |
| Rain chance (%) | |
|---|---|
| 1 | 35 |
| 2 | 34 |
| 3 | 33 |
| 4 | 32 |
| 5 | 32 |
| 6 | 31 |
| 7 | 30 |
| 8 | 29 |
| 9 | 28 |
| 10 | 27 |
| 11 | 27 |
| 12 | 26 |
| 13 | 26 |
| 14 | 26 |
| 15 | 26 |
| 16 | 26 |
| 17 | 26 |
| 18 | 26 |
| 19 | 27 |
| 20 | 27 |
| 21 | 27 |
| 22 | 27 |
| 23 | 26 |
| 24 | 26 |
| 25 | 26 |
| 26 | 25 |
| 27 | 25 |
| 28 | 24 |
| 29 | 23 |
| 30 | 23 |
| 31 | 22 |
Humidity in January
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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
| Muggy (%) | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 18 | 18 | 19 | 20 | 21 | 22 | 23 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 31 | 32 | 33 | 34 |
| Oppressive (%) | 74 | 74 | 74 | 76 | 76 | 76 | 76 | 77 | 77 | 76 | 76 | 75 | 76 | 75 | 74 | 73 | 72 | 71 | 71 | 70 | 69 | 68 | 66 | 65 | 64 | 63 | 62 | 61 | 61 | 60 | 59 |
| Miserable (%) | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 1 | 16 | 74 | 9 |
| 2 | 1 | 16 | 74 | 9 |
| 3 | 1 | 16 | 74 | 9 |
| 4 | 0 | 16 | 76 | 8 |
| 5 | 0 | 16 | 76 | 8 |
| 6 | 0 | 16 | 76 | 8 |
| 7 | 0 | 16 | 76 | 8 |
| 8 | 0 | 16 | 77 | 7 |
| 9 | 0 | 16 | 77 | 7 |
| 10 | 0 | 17 | 76 | 7 |
| 11 | 0 | 17 | 76 | 7 |
| 12 | 0 | 18 | 75 | 7 |
| 13 | 0 | 18 | 76 | 6 |
| 14 | 0 | 19 | 75 | 6 |
| 15 | 0 | 20 | 74 | 6 |
| 16 | 0 | 21 | 73 | 6 |
| 17 | 0 | 22 | 72 | 6 |
| 18 | 0 | 23 | 71 | 6 |
| 19 | 0 | 23 | 71 | 6 |
| 20 | 0 | 24 | 70 | 6 |
| 21 | 0 | 25 | 69 | 6 |
| 22 | 0 | 26 | 68 | 6 |
| 23 | 1 | 27 | 66 | 6 |
| 24 | 1 | 28 | 65 | 6 |
| 25 | 1 | 29 | 64 | 6 |
| 26 | 1 | 30 | 63 | 6 |
| 27 | 1 | 31 | 62 | 6 |
| 28 | 2 | 31 | 61 | 6 |
| 29 | 2 | 32 | 61 | 5 |
| 30 | 2 | 33 | 60 | 5 |
| 31 | 2 | 34 | 59 | 5 |
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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
| 31 | 6 | calm |
Sunrise & sunset in January
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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 |
| Sunrise (AM) | 6:41 | 6:41 | 6:42 | 6:42 | 6:42 | 6:43 | 6:43 | 6:43 | 6:44 | 6:44 | 6:44 | 6:45 | 6:45 | 6:45 | 6:45 | 6:46 | 6:46 | 6:46 | 6:46 | 6:46 | 6:47 | 6:47 | 6:47 | 6:47 | 6:47 | 6:47 | 6:47 | 6:47 | 6:47 | 6:47 | 6:47 |
| Sunset (PM) | 6:11 | 6:11 | 6:12 | 6:12 | 6:13 | 6:13 | 6:14 | 6:14 | 6:15 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:18 | 6:18 | 6:18 | 6:19 | 6:19 | 6:20 | 6:20 | 6:21 | 6:21 | 6:22 | 6:22 | 6:22 | 6:23 | 6:23 | 6:24 | 6:24 | 6:24 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.5 | 6:41 | 6:11 |
| 2 | 11.5 | 6:41 | 6:11 |
| 3 | 11.5 | 6:42 | 6:12 |
| 4 | 11.5 | 6:42 | 6:12 |
| 5 | 11.5 | 6:42 | 6:13 |
| 6 | 11.5 | 6:43 | 6:13 |
| 7 | 11.5 | 6:43 | 6:14 |
| 8 | 11.5 | 6:43 | 6:14 |
| 9 | 11.5 | 6:44 | 6:15 |
| 10 | 11.5 | 6:44 | 6:15 |
| 11 | 11.5 | 6:44 | 6:16 |
| 12 | 11.5 | 6:45 | 6:16 |
| 13 | 11.5 | 6:45 | 6:17 |
| 14 | 11.5 | 6:45 | 6:17 |
| 15 | 11.5 | 6:45 | 6:18 |
| 16 | 11.5 | 6:46 | 6:18 |
| 17 | 11.5 | 6:46 | 6:18 |
| 18 | 11.5 | 6:46 | 6:19 |
| 19 | 11.6 | 6:46 | 6:19 |
| 20 | 11.6 | 6:46 | 6:20 |
| 21 | 11.6 | 6:47 | 6:20 |
| 22 | 11.6 | 6:47 | 6:21 |
| 23 | 11.6 | 6:47 | 6:21 |
| 24 | 11.6 | 6:47 | 6:22 |
| 25 | 11.6 | 6:47 | 6:22 |
| 26 | 11.6 | 6:47 | 6:22 |
| 27 | 11.6 | 6:47 | 6:23 |
| 28 | 11.6 | 6:47 | 6:23 |
| 29 | 11.6 | 6:47 | 6:24 |
| 30 | 11.6 | 6:47 | 6:24 |
| 31 | 11.6 | 6:47 | 6:24 |
Solar energy in January
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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.5 | 4.5 | 4.5 | 4.5 | 4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.5 | Bright |
| 2 | 4.5 | Bright |
| 3 | 4.5 | Bright |
| 4 | 4.5 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.6 | Bright |
| 8 | 4.7 | Bright |
| 9 | 4.7 | Bright |
| 10 | 4.7 | Bright |
| 11 | 4.7 | Bright |
| 12 | 4.8 | Bright |
| 13 | 4.8 | Bright |
| 14 | 4.8 | Bright |
| 15 | 4.8 | Bright |
| 16 | 4.9 | Bright |
| 17 | 4.9 | Bright |
| 18 | 4.9 | Bright |
| 19 | 5.0 | Bright |
| 20 | 5.0 | Bright |
| 21 | 5.0 | Bright |
| 22 | 5.0 | Bright |
| 23 | 5.0 | Bright |
| 24 | 5.1 | Bright |
| 25 | 5.1 | Bright |
| 26 | 5.1 | Bright |
| 27 | 5.2 | Bright |
| 28 | 5.2 | Bright |
| 29 | 5.2 | Bright |
| 30 | 5.3 | Bright |
| 31 | 5.3 | Bright |
Hazard calendar for Ban Na San
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.
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).
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.
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.
| 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 January
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.
| 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 January
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).
| 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. 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).