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Weather & Climate in Diễn Thành, Vietnam
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Diễn Thành has a warm climate with an average annual temperature of 76°F (24°C). Winters average 64°F in January while summers reach 85°F in July. The area gets 241 sunny days per year, above the national average. Annual precipitation totals 54.0 inches (wetter than the 38-inch national average). The city sits at an elevation of 30 feet.
Temperature
64°F Jan (18°C)
85°F Jul (29°C)
| Annual Average | 75.6°F |
| 40% above US avg | |
| January Average | 64°F (18°C) |
| July Average | 85°F (29°C) |
| Sunny Days | 241 days/yr |
Geography
| Elevation | 30 ft (9 m) |
| Area | 9.5 sq mi (24.6 km²) |
| Population Density | 2,274/sq mi |
| Coordinates | 18.9765°N, 105.6003°W |
| Timezone | Asia/Bangkok |
Precipitation & Snow
Air Quality
Hurricane History
31 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Kajiki | Category 2 | — | 43 km |
| 2025 | Bualoi | Category 1 | — | 107 km |
| 2024 | Yagi | Category 3 | 104 mph | 225 km |
| 2020 | Vamco | Category 2 | 75 mph | 236 km |
| 2017 | Doksuri | Category 2 | 92 mph | 124 km |
| 2016 | Mirinae | Category 1 | 52 mph | 150 km |
| 2013 | Wutip | Category 2 | 75 mph | 133 km |
| 2013 | Haiyan | Category 1 | 75 mph | 234 km |
| 2012 | Son-tinh | Category 3 | 92 mph | 153 km |
| 2010 | Mindulle | Category 1 | 52 mph | 204 km |
| 2007 | Lekima | Category 1 | 63 mph | 153 km |
| 2000 | Wukong | Category 1 | 58 mph | 269 km |
| 1997 | Zita | Category 1 | 52 mph | 253 km |
| 1996 | Frankie | Category 2 | 58 mph | 151 km |
| 1996 | Niki | Category 1 | 75 mph | 114 km |
| 1996 | Willie | Category 1 | 52 mph | 182 km |
| 1995 | Ted | Category 1 | 58 mph | 266 km |
| 1995 | Lois | Category 1 | 58 mph | 27 km |
| 1993 | Lewis | Category 1 | 63 mph | 126 km |
| 1991 | Fred | Category 2 | 75 mph | 131 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1899 | NORTH CENTRAL VIETNAM | Unknown | 3.0 m | — | 42 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 64°F (18°C) | 0.8 in | Coldest, Driest |
| February | 66°F (19°C) | 1.5 in | |
| March | 70°F (21°C) | 1.3 in | |
| April | 76°F (25°C) | 1.7 in | |
| May | 82°F (28°C) | 3.3 in | |
| June | 85°F (30°C) | 4.3 in | Warmest |
| July | 85°F (29°C) | 6.2 in | |
| August | 84°F (29°C) | 8.6 in | |
| September | 81°F (27°C) | 14.3 in | Wettest |
| October | 77°F (25°C) | 7.1 in | |
| November | 72°F (22°C) | 3.3 in | |
| December | 67°F (19°C) | 1.7 in |
Diễn Thành has a seasonal temperature swing of 21°F / from 64°F in January to 85°F in June. Total annual precipitation is 54.0 inches, with September being the wettest month (14.3") and January the driest (0.8").