Bỉm Sơn weather in September
In September, Bỉm Sơn sees average daytime highs of 31°C and overnight lows near 25°C, with 278 mm of rain across 20.8 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.
Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels miserable.
Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Bỉm Sơn's 5th-clearest and 11th-windiest month. For the whole year in context, see Bỉm Sơn's year-round climate.
- Daytime high
- 31°
- 5th warmest
- Overnight low
- 25°
- 8th coldest
- Rainfall
- 278 mm
- 20.8 wet days
- Daylight
- 12 h 06 min
- 5:47 AM – 5:54 PM
- Cloud cover
- 74%
- 5th clearest
- Wind
- 7 km/h
- 11th windiest
- Solar energy
- 4.27 kWh/m²
- Travel score
- 3.2
- out of 10
Bỉm Sơn is district-level town in Thanh Hóa province, Vietnam.
- Density
- 802/km²
- people per km²
- Founded
- 1981
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 31°C through the month.
A typical September day in Bỉm Sơn reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 34°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°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) | 32 | 32 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 30 |
| Avg low (°C) | 26 | 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 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 32 | 26 |
| 2 | 32 | 26 |
| 3 | 32 | 26 |
| 4 | 32 | 26 |
| 5 | 32 | 26 |
| 6 | 32 | 26 |
| 7 | 31 | 25 |
| 8 | 31 | 25 |
| 9 | 31 | 25 |
| 10 | 31 | 25 |
| 11 | 31 | 25 |
| 12 | 31 | 25 |
| 13 | 31 | 25 |
| 14 | 31 | 25 |
| 15 | 31 | 25 |
| 16 | 31 | 25 |
| 17 | 31 | 25 |
| 18 | 31 | 25 |
| 19 | 31 | 25 |
| 20 | 31 | 25 |
| 21 | 31 | 25 |
| 22 | 31 | 25 |
| 23 | 31 | 25 |
| 24 | 31 | 24 |
| 25 | 31 | 24 |
| 26 | 31 | 24 |
| 27 | 30 | 24 |
| 28 | 30 | 24 |
| 29 | 30 | 24 |
| 30 | 30 | 24 |
How September really feels in Bỉm Sơn
Once humidity and wind are folded in, September averages 30 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.
Bỉm Sơn weather by month
How September compares with the rest of the year at a glance. September is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 21° / 15° | 29 | 5.6 | 10.9 | 6.7 |
| Feb | 22° / 16° | 17 | 4.4 | 11.3 | 7.0 |
| Mar | 25° / 19° | 35 | 6.7 | 11.9 | 7.0 |
| Apr | 29° / 22° | 64 | 8.6 | 12.4 | 5.5 |
| May | 32° / 25° | 178 | 15.5 | 12.9 | 3.3 |
| Jun | 34° / 27° | 178 | 14.6 | 13.2 | 2.5 |
| Jul | 33° / 27° | 234 | 17.8 | 13.1 | 2.5 |
| Aug | 32° / 26° | 324 | 23 | 12.7 | 2.6 |
| Sep | 31° / 25° | 278 | 20.8 | 12.1 | 3.2 |
| Oct | 29° / 23° | 156 | 14.5 | 11.5 | 5.1 |
| Nov | 26° / 19° | 57 | 7.9 | 11 | 6.9 |
| Dec | 22° / 16° | 25 | 5.4 | 10.8 | 7.1 |
Cloud cover in September
The sky is clear or mostly clear about 17% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 71%. 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 (%) | 18 | 18 | 18 | 18 | 19 | 19 | 20 | 20 | 21 | 21 | 24 | 24 | 25 | 26 | 27 | 29 | 30 | 31 | 33 | 33 | 36 | 37 | 37 | 38 | 40 | 40 | 41 | 41 | 41 | 43 |
| Cloudier (%) | 82 | 82 | 82 | 82 | 81 | 81 | 80 | 80 | 79 | 79 | 76 | 76 | 75 | 74 | 73 | 71 | 70 | 69 | 67 | 67 | 64 | 63 | 63 | 62 | 60 | 60 | 59 | 59 | 59 | 57 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 18 | 82 |
| 2 | 18 | 82 |
| 3 | 18 | 82 |
| 4 | 18 | 82 |
| 5 | 19 | 81 |
| 6 | 19 | 81 |
| 7 | 20 | 80 |
| 8 | 20 | 80 |
| 9 | 21 | 79 |
| 10 | 21 | 79 |
| 11 | 24 | 76 |
| 12 | 24 | 76 |
| 13 | 25 | 75 |
| 14 | 26 | 74 |
| 15 | 27 | 73 |
| 16 | 29 | 71 |
| 17 | 30 | 70 |
| 18 | 31 | 69 |
| 19 | 33 | 67 |
| 20 | 33 | 67 |
| 21 | 36 | 64 |
| 22 | 37 | 63 |
| 23 | 37 | 63 |
| 24 | 38 | 62 |
| 25 | 40 | 60 |
| 26 | 40 | 60 |
| 27 | 41 | 59 |
| 28 | 41 | 59 |
| 29 | 41 | 59 |
| 30 | 43 | 57 |
Chance of precipitation in September
Bỉm Sơn gets around 278 mm of rain over 20.8 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 70% and peaks near 82% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 82 | 82 | 81 | 81 | 81 | 80 | 80 | 79 | 78 | 77 | 76 | 74 | 73 | 72 | 70 | 69 | 68 | 66 | 65 | 64 | 62 | 61 | 60 | 60 | 59 | 59 | 58 | 58 | 58 | 57 |
| Rain chance (%) | |
|---|---|
| 1 | 82 |
| 2 | 82 |
| 3 | 81 |
| 4 | 81 |
| 5 | 81 |
| 6 | 80 |
| 7 | 80 |
| 8 | 79 |
| 9 | 78 |
| 10 | 77 |
| 11 | 76 |
| 12 | 74 |
| 13 | 73 |
| 14 | 72 |
| 15 | 70 |
| 16 | 69 |
| 17 | 68 |
| 18 | 66 |
| 19 | 65 |
| 20 | 64 |
| 21 | 62 |
| 22 | 61 |
| 23 | 60 |
| 24 | 60 |
| 25 | 59 |
| 26 | 59 |
| 27 | 58 |
| 28 | 58 |
| 29 | 58 |
| 30 | 57 |
Humidity in September
Most of September feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the miserable band about 75% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 |
| Muggy (%) | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 4 | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 12 | 13 |
| Oppressive (%) | 4 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 18 | 19 | 20 | 22 | 23 | 24 | 26 | 27 | 28 | 29 | 31 | 31 | 32 | 33 | 33 | 34 |
| Miserable (%) | 96 | 95 | 94 | 94 | 91 | 90 | 89 | 88 | 86 | 85 | 84 | 82 | 81 | 79 | 77 | 76 | 74 | 71 | 70 | 68 | 66 | 63 | 62 | 60 | 58 | 57 | 56 | 53 | 52 | 50 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 0 | 0 | 4 | 96 |
| 2 | 0 | 0 | 5 | 95 |
| 3 | 0 | 0 | 6 | 94 |
| 4 | 0 | 0 | 6 | 94 |
| 5 | 1 | 1 | 7 | 91 |
| 6 | 1 | 1 | 8 | 90 |
| 7 | 1 | 1 | 9 | 89 |
| 8 | 1 | 1 | 10 | 88 |
| 9 | 1 | 2 | 11 | 86 |
| 10 | 1 | 2 | 12 | 85 |
| 11 | 1 | 2 | 13 | 84 |
| 12 | 1 | 3 | 14 | 82 |
| 13 | 1 | 3 | 15 | 81 |
| 14 | 1 | 4 | 16 | 79 |
| 15 | 1 | 4 | 18 | 77 |
| 16 | 1 | 4 | 19 | 76 |
| 17 | 1 | 5 | 20 | 74 |
| 18 | 1 | 6 | 22 | 71 |
| 19 | 1 | 6 | 23 | 70 |
| 20 | 1 | 7 | 24 | 68 |
| 21 | 1 | 7 | 26 | 66 |
| 22 | 2 | 8 | 27 | 63 |
| 23 | 2 | 8 | 28 | 62 |
| 24 | 2 | 9 | 29 | 60 |
| 25 | 2 | 9 | 31 | 58 |
| 26 | 2 | 10 | 31 | 57 |
| 27 | 2 | 10 | 32 | 56 |
| 28 | 3 | 11 | 33 | 53 |
| 29 | 3 | 12 | 33 | 52 |
| 30 | 3 | 13 | 34 | 50 |
Wind in September
Winds average 7 km/h in September.
Across September, daily wind ranges from about 6 km/h on the calmest days to 8 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) | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| 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 |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | 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 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 8 | calm |
| 20 | 8 | calm |
| 21 | 8 | calm |
| 22 | 8 | calm |
| 23 | 8 | calm |
| 24 | 8 | calm |
| 25 | 8 | calm |
| 26 | 8 | calm |
| 27 | 8 | calm |
| 28 | 8 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over September. Sunrise moves from 5:44 AM to 5:51 AM, and sunset from 6:08 PM to 5:41 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) | 12.4 | 12.4 | 12.4 | 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 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 |
| Sunrise (AM) | 5:44 | 5:44 | 5:45 | 5:45 | 5:45 | 5:45 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:47 | 5:47 | 5:47 | 5:47 | 5:47 | 5:48 | 5:48 | 5:48 | 5:48 | 5:49 | 5:49 | 5:49 | 5:49 | 5:50 | 5:50 | 5:50 | 5:50 | 5:50 | 5:51 |
| Sunset (PM) | 6:08 | 6:07 | 6:07 | 6:06 | 6:05 | 6:04 | 6:03 | 6:02 | 6:01 | 6:00 | 5:59 | 5:58 | 5:57 | 5:56 | 5:55 | 5:54 | 5:53 | 5:52 | 5:51 | 5:50 | 5:49 | 5:49 | 5:48 | 5:47 | 5:46 | 5:45 | 5:44 | 5:43 | 5:42 | 5:41 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 5:44 | 6:08 |
| 2 | 12.4 | 5:44 | 6:07 |
| 3 | 12.4 | 5:45 | 6:07 |
| 4 | 12.3 | 5:45 | 6:06 |
| 5 | 12.3 | 5:45 | 6:05 |
| 6 | 12.3 | 5:45 | 6:04 |
| 7 | 12.3 | 5:46 | 6:03 |
| 8 | 12.3 | 5:46 | 6:02 |
| 9 | 12.2 | 5:46 | 6:01 |
| 10 | 12.2 | 5:46 | 6:00 |
| 11 | 12.2 | 5:46 | 5:59 |
| 12 | 12.2 | 5:47 | 5:58 |
| 13 | 12.2 | 5:47 | 5:57 |
| 14 | 12.2 | 5:47 | 5:56 |
| 15 | 12.1 | 5:47 | 5:55 |
| 16 | 12.1 | 5:47 | 5:54 |
| 17 | 12.1 | 5:48 | 5:53 |
| 18 | 12.1 | 5:48 | 5:52 |
| 19 | 12.1 | 5:48 | 5:51 |
| 20 | 12.0 | 5:48 | 5:50 |
| 21 | 12.0 | 5:49 | 5:49 |
| 22 | 12.0 | 5:49 | 5:49 |
| 23 | 12.0 | 5:49 | 5:48 |
| 24 | 12.0 | 5:49 | 5:47 |
| 25 | 11.9 | 5:50 | 5:46 |
| 26 | 11.9 | 5:50 | 5:45 |
| 27 | 11.9 | 5:50 | 5:44 |
| 28 | 11.9 | 5:50 | 5:43 |
| 29 | 11.9 | 5:50 | 5:42 |
| 30 | 11.8 | 5:51 | 5:41 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.27 kWh/m².
For context, solar energy here swings from a low near 2.43 kWh/m² to a high of 5.33 kWh/m² in June across the year — September's 4.27 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) | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 |
| 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 | 4.4 | Bright |
| 2 | 4.4 | Bright |
| 3 | 4.3 | Bright |
| 4 | 4.3 | Bright |
| 5 | 4.3 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.3 | Bright |
| 8 | 4.3 | Bright |
| 9 | 4.3 | Bright |
| 10 | 4.2 | Bright |
| 11 | 4.2 | Bright |
| 12 | 4.2 | Bright |
| 13 | 4.2 | Bright |
| 14 | 4.2 | Bright |
| 15 | 4.3 | 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 | 4.3 | Bright |
| 23 | 4.3 | Bright |
| 24 | 4.3 | Bright |
| 25 | 4.3 | Bright |
| 26 | 4.3 | Bright |
| 27 | 4.3 | Bright |
| 28 | 4.3 | Bright |
| 29 | 4.2 | Bright |
| 30 | 4.2 | Bright |
Hazard calendar for Bỉm Sơn
In September, Bỉm Sơn sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Bỉm Sơn sits in the Pacific typhoon belt; the season peaks July–October.
Bỉm Sơn's monsoon runs May–October, when most of the year's rain falls.
Is September a good time to visit Bỉm Sơn?
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 Bỉm Sơn.
What to pack for Bỉm Sơn in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Bỉm Sơn sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 21 days see rain.
Sea temperature near Bỉm Sơn 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 at the nearest coast (about 36 km away) is warmest in August at about 30°C and coldest in February near 20°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) | 21 | 20 | 21 | 24 | 28 | 29 | 30 | 30 | 29 | 28 | 26 | 23 |
| Comfort | Refreshing | Refreshing | Refreshing | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 20 | Refreshing |
| Mar | 21 | Refreshing |
| Apr | 24 | Refreshing |
| May | 28 | Warm |
| Jun | 29 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 26 | Warm |
| Dec | 23 | Refreshing |
UV index in Bỉm Sơn in September
Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Bỉm Sơn peaks around July 14 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 6 (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) | 7 | 9 | 10 | 8 | 10 | 12 | 12 | 11 | 9 | 9 | 7 | 6 |
| Level | Very high | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | Very high |
| Feb | 9 | Very high |
| Mar | 10 | Very high |
| Apr | 8 | Very high |
| May | 10 | Very high |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 11 | Extreme |
| Sep | 9 | Very high |
| Oct | 9 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Air quality in Bỉm Sơn 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 Bỉm Sơn is worst in December — around 134 µg/m³ PM2.5 (unhealthy), about 3.8× the cleanest month (July, 35 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) | 126 | 106 | 94 | 87 | 60 | 42 | 35 | 46 | 69 | 93 | 116 | 134 |
| Level | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Moderate | Poor | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 126 | Unhealthy |
| Feb | 106 | Unhealthy |
| Mar | 94 | Unhealthy |
| Apr | 87 | Unhealthy |
| May | 60 | Unhealthy |
| Jun | 42 | Poor |
| Jul | 35 | Moderate |
| Aug | 46 | Poor |
| Sep | 69 | Unhealthy |
| Oct | 93 | Unhealthy |
| Nov | 116 | Unhealthy |
| Dec | 134 | Unhealthy |
Where is Bỉm Sơn?
Bỉm Sơn sits at 20.1°N, 105.9°E, 7 m above sea level, in Vietnam. The nearest listed city is Nga Sơn, 14 km away.
Topography around Bỉm Sơn
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bỉm Sơn.
Within 3 km, the terrain around Bỉm Sơn has only modest variations in elevation — a maximum elevation change of 99 m around an average of 13 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 327 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,500 m.
The land around Bỉm Sơn is covered by trees (39%) and cropland (27%) within 3 km, trees (52%) and cropland (33%) within 16 km, and trees (41%), cropland (29%) and water (23%) 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 Bỉm Sơn (20.0781°, 105.8603°, elevation 7 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).