Lý Sơn weather in December
In December, Lý Sơn sees average daytime highs of 25°C and overnight lows near 23°C, with 291 mm of rain across 23 wet days and about 11.1 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.
Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 14% of the time in December, and the air most often feels oppressive.
Daylight stretches from about 11 h 12 min at the start of December to 11 h 06 min by month's end. Set against the rest of the year, December is Lý Sơn's 8th-clearest and 1st-windiest month. For the whole year in context, see Lý Sơn's year-round climate.
- Daytime high
- 25°
- 10th warmest
- Overnight low
- 23°
- 3rd coldest
- Rainfall
- 291 mm
- 23 wet days
- Daylight
- 11 h 06 min
- 6:07 AM – 5:12 PM
- Cloud cover
- 71%
- 8th clearest
- Wind
- 18 km/h
- 1st windiest
- Solar energy
- 3.15 kWh/m²
- Travel score
- 4.8
- out of 10
Temperature in December
Day-to-day highs hold fairly steady near 25°C through the month.
A typical December day in Lý Sơn reaches about 25°C in the afternoon and slips back to 23°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 27°C. Set against its neighbours, December runs about 2°C cooler than November and on par with January.
| 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) | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Avg low (°C) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 26 | 23 |
| 2 | 26 | 23 |
| 3 | 26 | 23 |
| 4 | 26 | 23 |
| 5 | 26 | 23 |
| 6 | 25 | 23 |
| 7 | 25 | 23 |
| 8 | 25 | 23 |
| 9 | 25 | 23 |
| 10 | 25 | 23 |
| 11 | 25 | 23 |
| 12 | 25 | 23 |
| 13 | 25 | 23 |
| 14 | 25 | 23 |
| 15 | 25 | 23 |
| 16 | 25 | 23 |
| 17 | 25 | 22 |
| 18 | 25 | 22 |
| 19 | 25 | 22 |
| 20 | 25 | 22 |
| 21 | 25 | 22 |
| 22 | 25 | 22 |
| 23 | 24 | 22 |
| 24 | 24 | 22 |
| 25 | 24 | 22 |
| 26 | 24 | 22 |
| 27 | 24 | 22 |
| 28 | 24 | 22 |
| 29 | 24 | 22 |
| 30 | 24 | 22 |
| 31 | 24 | 22 |
How December really feels in Lý Sơn
Once humidity and wind are folded in, December 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.
December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Lý Sơn weather by month
How December compares with the rest of the year at a glance. December is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 24° / 22° | 125 | 16.8 | 11.2 | 5.9 |
| Feb | 25° / 22° | 71 | 10.6 | 11.5 | 6.8 |
| Mar | 27° / 24° | 72 | 8.9 | 11.9 | 7.0 |
| Apr | 29° / 25° | 54 | 7.6 | 12.3 | 6.1 |
| May | 31° / 27° | 82 | 12.1 | 12.7 | 4.4 |
| Jun | 32° / 28° | 65 | 11.3 | 12.9 | 3.7 |
| Jul | 32° / 28° | 81 | 12.8 | 12.8 | 3.8 |
| Aug | 31° / 28° | 116 | 17.3 | 12.5 | 3.4 |
| Sep | 30° / 26° | 273 | 22.7 | 12.1 | 3.4 |
| Oct | 28° / 25° | 375 | 25.1 | 11.7 | 4.0 |
| Nov | 27° / 24° | 377 | 22.5 | 11.3 | 4.6 |
| Dec | 25° / 23° | 291 | 23 | 11.1 | 4.8 |
Cloud cover in December
The sky is clear or mostly clear about 14% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 20% of December, with mostly cloudy or overcast conditions the remaining 65%.
| 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 (%) | 41 | 40 | 38 | 37 | 37 | 35 | 34 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 33 | 33 | 33 | 33 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 36 | 36 | 37 | 37 | 38 | 38 |
| Cloudier (%) | 59 | 60 | 62 | 63 | 63 | 65 | 66 | 67 | 67 | 67 | 68 | 68 | 68 | 68 | 67 | 67 | 67 | 67 | 67 | 67 | 66 | 66 | 66 | 66 | 66 | 64 | 64 | 63 | 63 | 62 | 62 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 41 | 59 |
| 2 | 40 | 60 |
| 3 | 38 | 62 |
| 4 | 37 | 63 |
| 5 | 37 | 63 |
| 6 | 35 | 65 |
| 7 | 34 | 66 |
| 8 | 33 | 67 |
| 9 | 33 | 67 |
| 10 | 33 | 67 |
| 11 | 32 | 68 |
| 12 | 32 | 68 |
| 13 | 32 | 68 |
| 14 | 32 | 68 |
| 15 | 33 | 67 |
| 16 | 33 | 67 |
| 17 | 33 | 67 |
| 18 | 33 | 67 |
| 19 | 33 | 67 |
| 20 | 33 | 67 |
| 21 | 34 | 66 |
| 22 | 34 | 66 |
| 23 | 34 | 66 |
| 24 | 34 | 66 |
| 25 | 34 | 66 |
| 26 | 36 | 64 |
| 27 | 36 | 64 |
| 28 | 37 | 63 |
| 29 | 37 | 63 |
| 30 | 38 | 62 |
| 31 | 38 | 62 |
Chance of precipitation in December
Lý Sơn gets around 291 mm of rain over 23 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 73% and peaks near 79% 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 (%) | 77 | 77 | 77 | 77 | 78 | 78 | 78 | 79 | 79 | 79 | 79 | 79 | 79 | 78 | 77 | 76 | 75 | 74 | 74 | 73 | 72 | 71 | 70 | 69 | 68 | 66 | 65 | 64 | 63 | 62 | 61 |
| Rain chance (%) | |
|---|---|
| 1 | 77 |
| 2 | 77 |
| 3 | 77 |
| 4 | 77 |
| 5 | 78 |
| 6 | 78 |
| 7 | 78 |
| 8 | 79 |
| 9 | 79 |
| 10 | 79 |
| 11 | 79 |
| 12 | 79 |
| 13 | 79 |
| 14 | 78 |
| 15 | 77 |
| 16 | 76 |
| 17 | 75 |
| 18 | 74 |
| 19 | 74 |
| 20 | 73 |
| 21 | 72 |
| 22 | 71 |
| 23 | 70 |
| 24 | 69 |
| 25 | 68 |
| 26 | 66 |
| 27 | 65 |
| 28 | 64 |
| 29 | 63 |
| 30 | 62 |
| 31 | 61 |
Humidity in December
Most of December feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the oppressive band about 47% of days. Sticky, muggy-or-worse air turns up on roughly 85% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 |
| Comfortable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 4 | 4 |
| Humid (%) | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 11 | 11 | 12 | 13 | 13 | 14 | 14 | 14 | 15 | 15 | 15 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 |
| Muggy (%) | 22 | 23 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 35 | 36 | 37 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 48 | 49 | 49 |
| Oppressive (%) | 62 | 62 | 60 | 60 | 59 | 59 | 58 | 57 | 56 | 55 | 55 | 53 | 52 | 50 | 49 | 48 | 46 | 45 | 43 | 41 | 40 | 38 | 37 | 35 | 34 | 33 | 32 | 32 | 31 | 31 | 31 |
| Miserable (%) | 7 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 1 | 8 | 22 | 62 | 7 |
| 2 | 0 | 1 | 8 | 23 | 62 | 6 |
| 3 | 0 | 1 | 9 | 25 | 60 | 5 |
| 4 | 0 | 1 | 9 | 26 | 60 | 4 |
| 5 | 0 | 1 | 9 | 27 | 59 | 4 |
| 6 | 0 | 1 | 9 | 28 | 59 | 3 |
| 7 | 0 | 1 | 9 | 29 | 58 | 3 |
| 8 | 0 | 1 | 10 | 30 | 57 | 2 |
| 9 | 0 | 1 | 10 | 31 | 56 | 2 |
| 10 | 0 | 1 | 10 | 32 | 55 | 2 |
| 11 | 0 | 1 | 10 | 33 | 55 | 1 |
| 12 | 0 | 1 | 11 | 34 | 53 | 1 |
| 13 | 0 | 1 | 11 | 35 | 52 | 1 |
| 14 | 0 | 2 | 12 | 35 | 50 | 1 |
| 15 | 0 | 2 | 13 | 36 | 49 | 1 |
| 16 | 0 | 2 | 13 | 37 | 48 | 0 |
| 17 | 0 | 2 | 14 | 37 | 46 | 0 |
| 18 | 0 | 2 | 14 | 38 | 45 | 0 |
| 19 | 1 | 3 | 14 | 39 | 43 | 0 |
| 20 | 1 | 3 | 15 | 40 | 41 | 0 |
| 21 | 1 | 3 | 15 | 41 | 40 | 0 |
| 22 | 1 | 4 | 15 | 42 | 38 | 0 |
| 23 | 1 | 4 | 16 | 43 | 37 | 0 |
| 24 | 1 | 4 | 16 | 44 | 35 | 0 |
| 25 | 1 | 4 | 16 | 45 | 34 | 0 |
| 26 | 1 | 5 | 16 | 46 | 33 | 0 |
| 27 | 1 | 5 | 15 | 47 | 32 | 0 |
| 28 | 1 | 5 | 15 | 48 | 32 | 0 |
| 29 | 1 | 5 | 15 | 48 | 31 | 0 |
| 30 | 0 | 4 | 15 | 49 | 31 | 0 |
| 31 | 0 | 4 | 15 | 49 | 31 | 0 |
Wind in December
Winds average 18 km/h in December, the windiest month of the year.
Across December, daily wind ranges from about 16 km/h on the calmest days to 19 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) | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 16 | 16 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 18 | light breeze |
| 2 | 18 | light breeze |
| 3 | 18 | light breeze |
| 4 | 18 | light breeze |
| 5 | 18 | light breeze |
| 6 | 18 | light breeze |
| 7 | 18 | light breeze |
| 8 | 18 | light breeze |
| 9 | 18 | light breeze |
| 10 | 18 | light breeze |
| 11 | 18 | light breeze |
| 12 | 19 | light breeze |
| 13 | 19 | light breeze |
| 14 | 19 | light breeze |
| 15 | 19 | light breeze |
| 16 | 19 | light breeze |
| 17 | 19 | light breeze |
| 18 | 18 | light breeze |
| 19 | 18 | light breeze |
| 20 | 18 | light breeze |
| 21 | 18 | light breeze |
| 22 | 18 | light breeze |
| 23 | 18 | light breeze |
| 24 | 18 | light breeze |
| 25 | 17 | light breeze |
| 26 | 17 | light breeze |
| 27 | 17 | light breeze |
| 28 | 17 | light breeze |
| 29 | 17 | light breeze |
| 30 | 16 | light breeze |
| 31 | 16 | light breeze |
Sunrise & sunset in December
Daylight runs from about 11 h 12 min at the start of December to 11 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 6 minutes over December. Sunrise moves from 5:59 AM to 6:14 AM, and sunset from 5:08 PM to 5:20 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) | 11.2 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 |
| Sunrise (AM) | 5:59 | 5:59 | 6:00 | 6:00 | 6:01 | 6:01 | 6:02 | 6:03 | 6:03 | 6:04 | 6:04 | 6:05 | 6:05 | 6:06 | 6:06 | 6:07 | 6:07 | 6:08 | 6:08 | 6:09 | 6:09 | 6:10 | 6:10 | 6:11 | 6:11 | 6:12 | 6:12 | 6:13 | 6:13 | 6:13 | 6:14 |
| Sunset (PM) | 5:08 | 5:08 | 5:08 | 5:09 | 5:09 | 5:09 | 5:09 | 5:10 | 5:10 | 5:10 | 5:11 | 5:11 | 5:11 | 5:12 | 5:12 | 5:12 | 5:13 | 5:13 | 5:14 | 5:14 | 5:15 | 5:15 | 5:16 | 5:16 | 5:17 | 5:17 | 5:18 | 5:18 | 5:19 | 5:19 | 5:20 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.2 | 5:59 | 5:08 |
| 2 | 11.1 | 5:59 | 5:08 |
| 3 | 11.1 | 6:00 | 5:08 |
| 4 | 11.1 | 6:00 | 5:09 |
| 5 | 11.1 | 6:01 | 5:09 |
| 6 | 11.1 | 6:01 | 5:09 |
| 7 | 11.1 | 6:02 | 5:09 |
| 8 | 11.1 | 6:03 | 5:10 |
| 9 | 11.1 | 6:03 | 5:10 |
| 10 | 11.1 | 6:04 | 5:10 |
| 11 | 11.1 | 6:04 | 5:11 |
| 12 | 11.1 | 6:05 | 5:11 |
| 13 | 11.1 | 6:05 | 5:11 |
| 14 | 11.1 | 6:06 | 5:12 |
| 15 | 11.1 | 6:06 | 5:12 |
| 16 | 11.1 | 6:07 | 5:12 |
| 17 | 11.1 | 6:07 | 5:13 |
| 18 | 11.1 | 6:08 | 5:13 |
| 19 | 11.1 | 6:08 | 5:14 |
| 20 | 11.1 | 6:09 | 5:14 |
| 21 | 11.1 | 6:09 | 5:15 |
| 22 | 11.1 | 6:10 | 5:15 |
| 23 | 11.1 | 6:10 | 5:16 |
| 24 | 11.1 | 6:11 | 5:16 |
| 25 | 11.1 | 6:11 | 5:17 |
| 26 | 11.1 | 6:12 | 5:17 |
| 27 | 11.1 | 6:12 | 5:18 |
| 28 | 11.1 | 6:13 | 5:18 |
| 29 | 11.1 | 6:13 | 5:19 |
| 30 | 11.1 | 6:13 | 5:19 |
| 31 | 11.1 | 6:14 | 5:20 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 3.15 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 3.15 kWh/m² to a high of 6.48 kWh/m² in May across the year — December's 3.15 kWh/m² sits near the bottom.
| 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) | 3.4 | 3.3 | 3.3 | 3.3 | 3.3 | 3.2 | 3.2 | 3.2 | 3.2 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.2 | 3.2 | 3.2 | 3.3 | 3.3 | 3.3 | 3.3 | 3.4 | 3.4 | 3.5 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 3.4 | Moderate |
| 2 | 3.3 | Moderate |
| 3 | 3.3 | Moderate |
| 4 | 3.3 | Moderate |
| 5 | 3.3 | Moderate |
| 6 | 3.2 | Moderate |
| 7 | 3.2 | Moderate |
| 8 | 3.2 | Moderate |
| 9 | 3.2 | Moderate |
| 10 | 3.1 | Moderate |
| 11 | 3.1 | Moderate |
| 12 | 3.1 | Moderate |
| 13 | 3.1 | Moderate |
| 14 | 3.1 | Moderate |
| 15 | 3.1 | Moderate |
| 16 | 3.1 | Moderate |
| 17 | 3.1 | Moderate |
| 18 | 3.1 | Moderate |
| 19 | 3.1 | Moderate |
| 20 | 3.1 | Moderate |
| 21 | 3.1 | Moderate |
| 22 | 3.2 | Moderate |
| 23 | 3.2 | Moderate |
| 24 | 3.2 | Moderate |
| 25 | 3.3 | Moderate |
| 26 | 3.3 | Moderate |
| 27 | 3.3 | Moderate |
| 28 | 3.3 | Moderate |
| 29 | 3.4 | Moderate |
| 30 | 3.4 | Moderate |
| 31 | 3.5 | Moderate |
Hazard calendar for Lý Sơn
In December, Lý Sơn sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Lý Sơn sits in the Pacific typhoon belt; the season peaks July–October.
Lý Sơn's monsoon runs September–December, when most of the year's rain falls.
Is December a good time to visit Lý Sơn?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a reasonable time to visit Lý Sơn for sightseeing.
What to pack for Lý Sơn in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Lý Sơn sees daytime highs around 25°C and nights near 23°C. Pack rain gear. Worth having: light clothes. About 23 days see rain.
Sea temperature near Lý Sơn in December
The nearest coast averages about 25°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 30°C and coldest in February near 24°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) | 24 | 24 | 25 | 26 | 28 | 29 | 29 | 30 | 29 | 28 | 27 | 25 |
| Comfort | Warm | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Warm |
| Feb | 24 | Refreshing |
| Mar | 25 | Warm |
| Apr | 26 | Warm |
| May | 28 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 30 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 27 | Warm |
| Dec | 25 | Warm |
UV index in Lý Sơn in December
Clear-sky midday UV in December peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Lý Sơn peaks around August 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (very high).
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) | 9 | 11 | 12 | 12 | 12 | 12 | 13 | 13 | 11 | 11 | 9 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 9 | Very high |
| Feb | 11 | Extreme |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 11 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 7 | High |
Air quality in Lý Sơn in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Lý Sơn is worst in March — around 35 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 15 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 19 | 22 | 35 | 34 | 28 | 23 | 17 | 17 | 17 | 17 | 15 | 16 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 19 | Moderate |
| Feb | 22 | Moderate |
| Mar | 35 | Moderate |
| Apr | 34 | Moderate |
| May | 28 | Moderate |
| Jun | 23 | Moderate |
| Jul | 17 | Moderate |
| Aug | 17 | Moderate |
| Sep | 17 | Moderate |
| Oct | 17 | Moderate |
| Nov | 15 | Moderate |
| Dec | 16 | Moderate |
Where is Lý Sơn?
Lý Sơn sits at 15.4°N, 109.1°E, 22 m above sea level, in Vietnam. The nearest listed city is Mỹ Lại, 32 km away.
Topography around Lý Sơn
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lý Sơn.
Within 3 km, the terrain around Lý Sơn has only modest variations in elevation — a maximum elevation change of 163 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 163 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,379 m.
The land around Lý Sơn is covered by water (72%) within 3 km, water (99%) within 16 km, and water (66%) and trees (26%) within 80 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
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 Lý Sơn (15.372°, 109.1189°, elevation 22 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).