Diễn Thành weather in September
In September, Diễn Thành sees average daytime highs of 31°C and overnight lows near 25°C, with 293 mm of rain across 19.9 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.
Highs ease over the month, from about 32°C in the first days to 30°C by the end. 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 Diễn Thành's 8th-clearest and 12th-windiest month. For the whole year in context, see Diễn Thành's year-round climate.
- Daytime high
- 31°
- 5th warmest
- Overnight low
- 25°
- 8th coldest
- Rainfall
- 293 mm
- 19.9 wet days
- Daylight
- 12 h 06 min
- 5:49 AM – 5:55 PM
- Cloud cover
- 76%
- 8th clearest
- Wind
- 7 km/h
- 12th windiest
- Solar energy
- 4.41 kWh/m²
- Travel score
- 3.2
- out of 10
Temperature in September
Highs ease over the month, from about 32°C in the first days to 30°C by the end.
A typical September day in Diễn Thành 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 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) | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 30 |
| Avg low (°C) | 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 | 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 | 32 | 26 |
| 8 | 32 | 26 |
| 9 | 32 | 26 |
| 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 | 25 |
| 25 | 30 | 25 |
| 26 | 30 | 24 |
| 27 | 30 | 24 |
| 28 | 30 | 24 |
| 29 | 30 | 24 |
| 30 | 30 | 24 |
How September really feels in Diễn Thành
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.
Diễn Thành weather by month
How September compares with the rest of the year at a glance. September is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 21° / 16° | 17 | 3.9 | 11 | 7.0 |
| Feb | 23° / 17° | 13 | 3.3 | 11.4 | 7.4 |
| Mar | 26° / 19° | 31 | 5.3 | 11.9 | 7.2 |
| Apr | 30° / 23° | 49 | 6.9 | 12.4 | 5.3 |
| May | 33° / 26° | 115 | 14 | 12.9 | 3.1 |
| Jun | 35° / 28° | 116 | 12 | 13.1 | 2.1 |
| Jul | 34° / 28° | 171 | 14.2 | 13 | 2.3 |
| Aug | 33° / 27° | 259 | 20.5 | 12.6 | 2.6 |
| Sep | 31° / 25° | 293 | 19.9 | 12.1 | 3.2 |
| Oct | 29° / 23° | 238 | 17.5 | 11.6 | 4.8 |
| Nov | 26° / 20° | 62 | 9.1 | 11.1 | 6.7 |
| Dec | 22° / 17° | 26 | 5.1 | 10.9 | 7.2 |
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 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 (%) | 18 | 18 | 18 | 20 | 20 | 20 | 20 | 22 | 22 | 24 | 24 | 26 | 26 | 27 | 27 | 29 | 29 | 30 | 32 | 32 | 33 | 33 | 36 | 36 | 37 | 36 | 37 | 38 | 39 | 39 |
| Cloudier (%) | 82 | 82 | 82 | 80 | 80 | 80 | 80 | 78 | 78 | 76 | 76 | 74 | 74 | 73 | 73 | 71 | 71 | 70 | 68 | 68 | 67 | 67 | 64 | 64 | 63 | 64 | 63 | 62 | 61 | 61 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 18 | 82 |
| 2 | 18 | 82 |
| 3 | 18 | 82 |
| 4 | 20 | 80 |
| 5 | 20 | 80 |
| 6 | 20 | 80 |
| 7 | 20 | 80 |
| 8 | 22 | 78 |
| 9 | 22 | 78 |
| 10 | 24 | 76 |
| 11 | 24 | 76 |
| 12 | 26 | 74 |
| 13 | 26 | 74 |
| 14 | 27 | 73 |
| 15 | 27 | 73 |
| 16 | 29 | 71 |
| 17 | 29 | 71 |
| 18 | 30 | 70 |
| 19 | 32 | 68 |
| 20 | 32 | 68 |
| 21 | 33 | 67 |
| 22 | 33 | 67 |
| 23 | 36 | 64 |
| 24 | 36 | 64 |
| 25 | 37 | 63 |
| 26 | 36 | 64 |
| 27 | 37 | 63 |
| 28 | 38 | 62 |
| 29 | 39 | 61 |
| 30 | 39 | 61 |
Chance of precipitation in September
Diễn Thành gets around 293 mm of rain over 19.9 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 68% and peaks near 72% 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 (%) | 72 | 72 | 72 | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 70 | 69 | 69 | 69 | 68 | 68 | 67 | 66 | 66 | 65 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 |
| Rain chance (%) | |
|---|---|
| 1 | 72 |
| 2 | 72 |
| 3 | 72 |
| 4 | 71 |
| 5 | 71 |
| 6 | 71 |
| 7 | 71 |
| 8 | 70 |
| 9 | 70 |
| 10 | 70 |
| 11 | 70 |
| 12 | 69 |
| 13 | 69 |
| 14 | 69 |
| 15 | 68 |
| 16 | 68 |
| 17 | 67 |
| 18 | 66 |
| 19 | 66 |
| 20 | 65 |
| 21 | 64 |
| 22 | 64 |
| 23 | 64 |
| 24 | 64 |
| 25 | 64 |
| 26 | 64 |
| 27 | 64 |
| 28 | 64 |
| 29 | 64 |
| 30 | 64 |
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 74% 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 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 |
| Muggy (%) | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 10 |
| Oppressive (%) | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 12 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 23 | 25 | 26 | 28 | 30 | 31 | 33 | 34 | 35 | 36 | 37 | 38 |
| Miserable (%) | 92 | 91 | 91 | 89 | 89 | 88 | 88 | 86 | 86 | 85 | 83 | 82 | 81 | 79 | 77 | 76 | 74 | 73 | 71 | 69 | 68 | 65 | 63 | 62 | 59 | 57 | 55 | 54 | 52 | 50 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 0 | 0 | 8 | 92 |
| 2 | 0 | 0 | 9 | 91 |
| 3 | 0 | 0 | 9 | 91 |
| 4 | 0 | 1 | 10 | 89 |
| 5 | 0 | 1 | 10 | 89 |
| 6 | 0 | 1 | 11 | 88 |
| 7 | 0 | 1 | 11 | 88 |
| 8 | 0 | 2 | 12 | 86 |
| 9 | 0 | 2 | 12 | 86 |
| 10 | 0 | 2 | 13 | 85 |
| 11 | 0 | 3 | 14 | 83 |
| 12 | 0 | 3 | 15 | 82 |
| 13 | 0 | 3 | 16 | 81 |
| 14 | 0 | 4 | 17 | 79 |
| 15 | 1 | 4 | 18 | 77 |
| 16 | 1 | 4 | 19 | 76 |
| 17 | 1 | 5 | 20 | 74 |
| 18 | 1 | 5 | 21 | 73 |
| 19 | 1 | 5 | 23 | 71 |
| 20 | 1 | 5 | 25 | 69 |
| 21 | 1 | 5 | 26 | 68 |
| 22 | 1 | 6 | 28 | 65 |
| 23 | 1 | 6 | 30 | 63 |
| 24 | 1 | 6 | 31 | 62 |
| 25 | 1 | 7 | 33 | 59 |
| 26 | 2 | 7 | 34 | 57 |
| 27 | 2 | 8 | 35 | 55 |
| 28 | 2 | 8 | 36 | 54 |
| 29 | 2 | 9 | 37 | 52 |
| 30 | 2 | 10 | 38 | 50 |
Wind in September
Winds average 7 km/h in September, the calmest month.
Across September, daily wind ranges from about 7 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) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 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 | 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 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | 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 5:46 AM to 5:51 AM, and sunset from 6:09 PM to 5:42 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 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 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 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 |
| Sunrise (AM) | 5:46 | 5:46 | 5:46 | 5:47 | 5:47 | 5:47 | 5:47 | 5:47 | 5:47 | 5:48 | 5:48 | 5:48 | 5:48 | 5:48 | 5:49 | 5:49 | 5:49 | 5:49 | 5:49 | 5:49 | 5:50 | 5:50 | 5:50 | 5:50 | 5:50 | 5:51 | 5:51 | 5:51 | 5:51 | 5:51 |
| Sunset (PM) | 6:09 | 6:08 | 6:07 | 6:06 | 6:05 | 6:04 | 6:03 | 6:02 | 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 | 5:50 | 5:49 | 5:48 | 5:47 | 5:46 | 5:45 | 5:44 | 5:43 | 5:42 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 5:46 | 6:09 |
| 2 | 12.4 | 5:46 | 6:08 |
| 3 | 12.3 | 5:46 | 6:07 |
| 4 | 12.3 | 5:47 | 6:06 |
| 5 | 12.3 | 5:47 | 6:05 |
| 6 | 12.3 | 5:47 | 6:04 |
| 7 | 12.3 | 5:47 | 6:03 |
| 8 | 12.3 | 5:47 | 6:02 |
| 9 | 12.2 | 5:47 | 6:02 |
| 10 | 12.2 | 5:48 | 6:01 |
| 11 | 12.2 | 5:48 | 6:00 |
| 12 | 12.2 | 5:48 | 5:59 |
| 13 | 12.2 | 5:48 | 5:58 |
| 14 | 12.1 | 5:48 | 5:57 |
| 15 | 12.1 | 5:49 | 5:56 |
| 16 | 12.1 | 5:49 | 5:55 |
| 17 | 12.1 | 5:49 | 5:54 |
| 18 | 12.1 | 5:49 | 5:53 |
| 19 | 12.1 | 5:49 | 5:52 |
| 20 | 12.0 | 5:49 | 5:51 |
| 21 | 12.0 | 5:50 | 5:50 |
| 22 | 12.0 | 5:50 | 5:50 |
| 23 | 12.0 | 5:50 | 5:49 |
| 24 | 12.0 | 5:50 | 5:48 |
| 25 | 11.9 | 5:50 | 5:47 |
| 26 | 11.9 | 5:51 | 5:46 |
| 27 | 11.9 | 5:51 | 5:45 |
| 28 | 11.9 | 5:51 | 5:44 |
| 29 | 11.9 | 5:51 | 5:43 |
| 30 | 11.8 | 5:51 | 5:42 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.41 kWh/m².
For context, solar energy here swings from a low near 2.47 kWh/m² to a high of 5.73 kWh/m² in June across the year — September's 4.41 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 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 |
| 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 | 4.6 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.5 | Bright |
| 8 | 4.5 | Bright |
| 9 | 4.5 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.4 | Bright |
| 12 | 4.4 | Bright |
| 13 | 4.4 | Bright |
| 14 | 4.4 | Bright |
| 15 | 4.4 | Bright |
| 16 | 4.4 | 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 | 4.2 | Bright |
| 26 | 4.2 | Bright |
| 27 | 4.2 | Bright |
| 28 | 4.2 | Bright |
| 29 | 4.1 | Bright |
| 30 | 4.1 | Bright |
Hazard calendar for Diễn Thành
In September, Diễn Thành sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Diễn Thành sits in the Pacific typhoon belt; the season peaks July–October.
Diễn Thành's monsoon runs July–October, when most of the year's rain falls.
Is September a good time to visit Diễn Thành?
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 Diễn Thành.
What to pack for Diễn Thành in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Diễn Thành sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 20 days see rain.
Sea temperature near Diễn Thành in September
The nearest coast averages about 30°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 21°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 | 21 | 22 | 24 | 28 | 30 | 30 | 30 | 30 | 28 | 26 | 23 |
| Comfort | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 21 | Refreshing |
| Mar | 22 | Refreshing |
| Apr | 24 | Warm |
| May | 28 | Warm |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 28 | Warm |
| Nov | 26 | Warm |
| Dec | 23 | Refreshing |
UV index in Diễn Thành 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 Diễn Thành peaks around July 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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) | 8 | 9 | 10 | 9 | 11 | 12 | 12 | 12 | 11 | 10 | 7 | 6 |
| Level | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 9 | Very high |
| Mar | 10 | Very high |
| Apr | 9 | Very high |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Air quality in Diễn Thành 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 Diễn Thành is worst in April — around 62 µg/m³ PM2.5 (unhealthy), about 3.5× the cleanest month (July, 18 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) | 52 | 52 | 57 | 62 | 35 | 20 | 18 | 21 | 30 | 41 | 47 | 52 |
| Level | Poor | Poor | Unhealthy | Unhealthy | Poor | Moderate | Moderate | Moderate | Moderate | Poor | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 52 | Poor |
| Feb | 52 | Poor |
| Mar | 57 | Unhealthy |
| Apr | 62 | Unhealthy |
| May | 35 | Poor |
| Jun | 20 | Moderate |
| Jul | 18 | Moderate |
| Aug | 21 | Moderate |
| Sep | 30 | Moderate |
| Oct | 41 | Poor |
| Nov | 47 | Poor |
| Dec | 52 | Poor |
Where is Diễn Thành?
Diễn Thành sits at 19.0°N, 105.6°E, 9 m above sea level, in Vietnam. The nearest listed city is Kim Liên, 32 km away.
Topography around Diễn Thành
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Diễn Thành.
Within 3 km, the terrain around Diễn Thành has only modest variations in elevation — a maximum elevation change of 12 m around an average of 3 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 430 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,711 m.
The land around Diễn Thành is covered by cropland (44%) and artificial surfaces (21%) within 3 km, water (35%), cropland (33%) and trees (20%) within 16 km, and trees (54%) and water (28%) 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 Diễn Thành (18.9765°, 105.6003°, elevation 9 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).