Hoàn Lão weather in September
In September, Hoàn Lão sees average daytime highs of 29°C and overnight lows near 25°C, with 345 mm of rain across 19.6 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 3rd-wettest month of the year here.
Highs ease over the month, from about 30°C in the first days to 28°C by the end. The sky is clear or mostly clear about 15% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Hoàn Lão's 8th-clearest and 9th-windiest month. For the whole year in context, see Hoàn Lão's year-round climate.
- Daytime high
- 29°
- 5th warmest
- Overnight low
- 25°
- 8th coldest
- Rainfall
- 345 mm
- 19.6 wet days
- Daylight
- 12 h 06 min
- 5:45 AM – 5:51 PM
- Cloud cover
- 77%
- 8th clearest
- Wind
- 11 km/h
- 9th windiest
- Solar energy
- 4.39 kWh/m²
- Travel score
- 3.9
- out of 10
Temperature in September
Highs ease over the month, from about 30°C in the first days to 28°C by the end.
A typical September day in Hoàn Lão reaches about 29°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 26 |
| 2 | 30 | 26 |
| 3 | 30 | 26 |
| 4 | 30 | 26 |
| 5 | 30 | 26 |
| 6 | 30 | 26 |
| 7 | 30 | 26 |
| 8 | 30 | 26 |
| 9 | 30 | 26 |
| 10 | 30 | 26 |
| 11 | 30 | 26 |
| 12 | 30 | 26 |
| 13 | 30 | 25 |
| 14 | 29 | 25 |
| 15 | 29 | 25 |
| 16 | 29 | 25 |
| 17 | 29 | 25 |
| 18 | 29 | 25 |
| 19 | 29 | 25 |
| 20 | 29 | 25 |
| 21 | 29 | 25 |
| 22 | 29 | 25 |
| 23 | 29 | 25 |
| 24 | 29 | 25 |
| 25 | 29 | 25 |
| 26 | 28 | 25 |
| 27 | 28 | 25 |
| 28 | 28 | 25 |
| 29 | 28 | 25 |
| 30 | 28 | 24 |
How September really feels in Hoàn Lão
Once humidity and wind are folded in, September averages 27 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 September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Hoàn Lão weather by month
How September compares with the rest of the year at a glance. September is the 5th-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 | 21° / 18° | 125 | 17.4 | 11.1 | 5.2 |
| Feb | 22° / 18° | 77 | 13.8 | 11.4 | 5.8 |
| Mar | 25° / 21° | 82 | 13.3 | 11.9 | 6.2 |
| Apr | 28° / 23° | 88 | 12.8 | 12.4 | 5.6 |
| May | 30° / 26° | 112 | 14.7 | 12.8 | 4.2 |
| Jun | 32° / 27° | 63 | 8.1 | 13 | 3.9 |
| Jul | 32° / 27° | 94 | 10 | 12.9 | 3.9 |
| Aug | 31° / 26° | 146 | 13.5 | 12.6 | 3.9 |
| Sep | 29° / 25° | 345 | 19.6 | 12.1 | 3.9 |
| Oct | 27° / 24° | 531 | 24 | 11.6 | 4.5 |
| Nov | 25° / 21° | 366 | 20.9 | 11.2 | 4.9 |
| Dec | 22° / 19° | 228 | 20.3 | 11 | 4.8 |
Cloud cover in September
The sky is clear or mostly clear about 15% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 72%. Skies tend to open up as the month goes on.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 21 | 21 | 21 | 20 | 21 | 22 | 22 | 22 | 22 | 24 | 24 | 25 | 25 | 28 | 28 | 29 | 30 | 31 | 32 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 35 | 35 | 35 | 36 |
| Cloudier (%) | 79 | 79 | 79 | 80 | 79 | 78 | 78 | 78 | 78 | 76 | 76 | 75 | 75 | 72 | 72 | 71 | 70 | 69 | 68 | 67 | 67 | 66 | 66 | 66 | 66 | 66 | 65 | 65 | 65 | 64 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 21 | 79 |
| 2 | 21 | 79 |
| 3 | 21 | 79 |
| 4 | 20 | 80 |
| 5 | 21 | 79 |
| 6 | 22 | 78 |
| 7 | 22 | 78 |
| 8 | 22 | 78 |
| 9 | 22 | 78 |
| 10 | 24 | 76 |
| 11 | 24 | 76 |
| 12 | 25 | 75 |
| 13 | 25 | 75 |
| 14 | 28 | 72 |
| 15 | 28 | 72 |
| 16 | 29 | 71 |
| 17 | 30 | 70 |
| 18 | 31 | 69 |
| 19 | 32 | 68 |
| 20 | 33 | 67 |
| 21 | 33 | 67 |
| 22 | 34 | 66 |
| 23 | 34 | 66 |
| 24 | 34 | 66 |
| 25 | 34 | 66 |
| 26 | 34 | 66 |
| 27 | 35 | 65 |
| 28 | 35 | 65 |
| 29 | 35 | 65 |
| 30 | 36 | 64 |
Chance of precipitation in September
Hoàn Lão gets around 345 mm of rain over 19.6 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 66% and peaks near 75% on the wettest days. The odds climb 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 55 | 56 | 57 | 57 | 58 | 59 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 68 | 69 | 69 | 70 | 70 | 71 | 71 | 72 | 72 | 73 | 74 | 74 | 75 | 75 |
| Rain chance (%) | |
|---|---|
| 1 | 55 |
| 2 | 56 |
| 3 | 57 |
| 4 | 57 |
| 5 | 58 |
| 6 | 59 |
| 7 | 59 |
| 8 | 60 |
| 9 | 61 |
| 10 | 62 |
| 11 | 63 |
| 12 | 64 |
| 13 | 65 |
| 14 | 66 |
| 15 | 67 |
| 16 | 68 |
| 17 | 68 |
| 18 | 69 |
| 19 | 69 |
| 20 | 70 |
| 21 | 70 |
| 22 | 71 |
| 23 | 71 |
| 24 | 72 |
| 25 | 72 |
| 26 | 73 |
| 27 | 74 |
| 28 | 74 |
| 29 | 75 |
| 30 | 75 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 61% of days. Sticky, muggy-or-worse air turns up on roughly 100% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
| Muggy (%) | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 6 | 6 |
| Oppressive (%) | 62 | 62 | 62 | 61 | 61 | 61 | 61 | 61 | 60 | 59 | 58 | 58 | 58 | 58 | 57 | 57 | 58 | 58 | 58 | 59 | 60 | 61 | 62 | 62 | 63 | 64 | 64 | 65 | 65 | 66 |
| Miserable (%) | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 39 | 39 | 40 | 40 | 40 | 40 | 40 | 40 | 39 | 39 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 | 31 | 29 | 28 | 27 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 0 | 0 | 62 | 38 |
| 2 | 0 | 0 | 62 | 38 |
| 3 | 0 | 0 | 62 | 38 |
| 4 | 0 | 1 | 61 | 38 |
| 5 | 0 | 1 | 61 | 38 |
| 6 | 0 | 1 | 61 | 38 |
| 7 | 0 | 1 | 61 | 38 |
| 8 | 0 | 1 | 61 | 38 |
| 9 | 0 | 1 | 60 | 39 |
| 10 | 0 | 2 | 59 | 39 |
| 11 | 0 | 2 | 58 | 40 |
| 12 | 0 | 2 | 58 | 40 |
| 13 | 0 | 2 | 58 | 40 |
| 14 | 0 | 2 | 58 | 40 |
| 15 | 0 | 3 | 57 | 40 |
| 16 | 0 | 3 | 57 | 40 |
| 17 | 0 | 3 | 58 | 39 |
| 18 | 0 | 3 | 58 | 39 |
| 19 | 0 | 3 | 58 | 39 |
| 20 | 0 | 3 | 59 | 38 |
| 21 | 0 | 3 | 60 | 37 |
| 22 | 0 | 3 | 61 | 36 |
| 23 | 0 | 3 | 62 | 35 |
| 24 | 0 | 4 | 62 | 34 |
| 25 | 0 | 4 | 63 | 33 |
| 26 | 0 | 4 | 64 | 32 |
| 27 | 0 | 5 | 64 | 31 |
| 28 | 1 | 5 | 65 | 29 |
| 29 | 1 | 6 | 65 | 28 |
| 30 | 1 | 6 | 66 | 27 |
Wind in September
Winds average 11 km/h in September.
Across September, daily wind ranges from about 11 km/h on the calmest days to 12 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Feels | light breeze | 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 | 12 | light breeze |
| 2 | 12 | calm |
| 3 | 12 | calm |
| 4 | 12 | calm |
| 5 | 12 | calm |
| 6 | 12 | calm |
| 7 | 12 | calm |
| 8 | 11 | calm |
| 9 | 11 | calm |
| 10 | 11 | calm |
| 11 | 11 | calm |
| 12 | 11 | calm |
| 13 | 11 | calm |
| 14 | 11 | calm |
| 15 | 11 | calm |
| 16 | 11 | calm |
| 17 | 11 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 11 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 11 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 24 minutes over September. Sunrise moves from 5:43 AM to 5:47 AM, and sunset from 6:04 PM to 5:39 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 |
| Sunrise (AM) | 5:43 | 5:43 | 5:43 | 5:44 | 5:44 | 5:44 | 5:44 | 5:44 | 5:44 | 5:44 | 5:45 | 5:45 | 5:45 | 5:45 | 5:45 | 5:45 | 5:45 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:47 | 5:47 | 5:47 | 5:47 | 5:47 | 5:47 |
| Sunset (PM) | 6:04 | 6:03 | 6:02 | 6:02 | 6:01 | 6:00 | 5:59 | 5:58 | 5:57 | 5:56 | 5:56 | 5:55 | 5:54 | 5:53 | 5:52 | 5:51 | 5:50 | 5:49 | 5:48 | 5:48 | 5:47 | 5:46 | 5:45 | 5:44 | 5:43 | 5:42 | 5:42 | 5:41 | 5:40 | 5:39 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.3 | 5:43 | 6:04 |
| 2 | 12.3 | 5:43 | 6:03 |
| 3 | 12.3 | 5:43 | 6:02 |
| 4 | 12.3 | 5:44 | 6:02 |
| 5 | 12.3 | 5:44 | 6:01 |
| 6 | 12.3 | 5:44 | 6:00 |
| 7 | 12.2 | 5:44 | 5:59 |
| 8 | 12.2 | 5:44 | 5:58 |
| 9 | 12.2 | 5:44 | 5:57 |
| 10 | 12.2 | 5:44 | 5:56 |
| 11 | 12.2 | 5:45 | 5:56 |
| 12 | 12.2 | 5:45 | 5:55 |
| 13 | 12.1 | 5:45 | 5:54 |
| 14 | 12.1 | 5:45 | 5:53 |
| 15 | 12.1 | 5:45 | 5:52 |
| 16 | 12.1 | 5:45 | 5:51 |
| 17 | 12.1 | 5:45 | 5:50 |
| 18 | 12.1 | 5:46 | 5:49 |
| 19 | 12.0 | 5:46 | 5:48 |
| 20 | 12.0 | 5:46 | 5:48 |
| 21 | 12.0 | 5:46 | 5:47 |
| 22 | 12.0 | 5:46 | 5:46 |
| 23 | 12.0 | 5:46 | 5:45 |
| 24 | 12.0 | 5:46 | 5:44 |
| 25 | 11.9 | 5:47 | 5:43 |
| 26 | 11.9 | 5:47 | 5:42 |
| 27 | 11.9 | 5:47 | 5:42 |
| 28 | 11.9 | 5:47 | 5:41 |
| 29 | 11.9 | 5:47 | 5:40 |
| 30 | 11.9 | 5:47 | 5:39 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.39 kWh/m².
For context, solar energy here swings from a low near 2.38 kWh/m² to a high of 5.68 kWh/m² in May across the year — September's 4.39 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 4.0 |
| 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.7 | Bright |
| 2 | 4.7 | Bright |
| 3 | 4.7 | Bright |
| 4 | 4.7 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.6 | Bright |
| 8 | 4.5 | Bright |
| 9 | 4.5 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.5 | Bright |
| 12 | 4.4 | Bright |
| 13 | 4.4 | Bright |
| 14 | 4.4 | Bright |
| 15 | 4.4 | Bright |
| 16 | 4.3 | Bright |
| 17 | 4.3 | Bright |
| 18 | 4.3 | Bright |
| 19 | 4.3 | Bright |
| 20 | 4.3 | Bright |
| 21 | 4.3 | Bright |
| 22 | 4.2 | Bright |
| 23 | 4.2 | Bright |
| 24 | 4.2 | Bright |
| 25 | 4.2 | Bright |
| 26 | 4.1 | Bright |
| 27 | 4.1 | Bright |
| 28 | 4.1 | Bright |
| 29 | 4.1 | Bright |
| 30 | 4.0 | Bright |
Hazard calendar for Hoàn Lão
In September, Hoàn Lão sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Hoàn Lão sits in the Pacific typhoon belt; the season peaks July–October.
Hoàn Lão's monsoon runs September–November, when most of the year's rain falls.
Is September a good time to visit Hoàn Lão?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Hoàn Lão.
What to pack for Hoàn Lão in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Hoàn Lão sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. About 20 days see rain.
Sea temperature near Hoàn Lão in September
The nearest coast averages about 29°C in September — 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 22°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) | 22 | 22 | 23 | 25 | 28 | 29 | 29 | 30 | 29 | 28 | 26 | 24 |
| Comfort | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 22 | Refreshing |
| Feb | 22 | Refreshing |
| Mar | 23 | Refreshing |
| Apr | 25 | Warm |
| May | 28 | Warm |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 30 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 26 | Warm |
| Dec | 24 | Refreshing |
UV index in Hoàn Lão in September
Clear-sky midday UV in September 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 Hoàn Lão 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 (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) | 8 | 10 | 10 | 9 | 12 | 12 | 13 | 13 | 11 | 10 | 8 | 7 |
| Level | Very high | Extreme | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Extreme |
| Mar | 10 | Very high |
| Apr | 9 | Very high |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in Hoàn Lão in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Hoàn Lão is worst in April — around 65 µg/m³ PM2.5 (unhealthy), about 4.9× the cleanest month (July, 13 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) | 20 | 26 | 62 | 65 | 21 | 14 | 13 | 14 | 16 | 20 | 18 | 21 |
| Level | Moderate | Moderate | Unhealthy | Unhealthy | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 20 | Moderate |
| Feb | 26 | Moderate |
| Mar | 62 | Unhealthy |
| Apr | 65 | Unhealthy |
| May | 21 | Moderate |
| Jun | 14 | Moderate |
| Jul | 13 | Moderate |
| Aug | 14 | Moderate |
| Sep | 16 | Moderate |
| Oct | 20 | Moderate |
| Nov | 18 | Moderate |
| Dec | 21 | Moderate |
Where is Hoàn Lão?
Hoàn Lão sits at 17.6°N, 106.5°E, 10 m above sea level, in Vietnam. The nearest listed city is Đồng Hới, 16 km away.
Topography around Hoàn Lão
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hoàn Lão.
Within 3 km, the terrain around Hoàn Lão has only modest variations in elevation — a maximum elevation change of 21 m around an average of 6 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 967 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,612 m.
The land around Hoàn Lão is covered by cropland (41%) within 3 km, water (42%) and trees (35%) within 16 km, and trees (61%) and water (32%) 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 Hoàn Lão (17.5844°, 106.5343°, elevation 10 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).