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Weather & Climate in Wan Yai, Thailand
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Wan Yai has a warm climate with an average annual temperature of 79°F (26°C). Winters average 69°F in January while summers reach 82°F in July / relatively mild seasonal variation. The area gets 316 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 58.3 inches (wetter than the 38-inch national average). The city sits at an elevation of 502 feet.
Temperature
69°F Jan (20°C)
82°F Jul (28°C)
| Annual Average | 79.3°F |
| 47% above US avg | |
| January Average | 69°F (20°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 502 ft (153 m) |
| Area | 305.2 sq mi (790.4 km²) |
| Population Density | 0/sq mi |
| Coordinates | 16.7223°N, 104.7414°W |
| Timezone | Asia/Bangkok |
Precipitation & Snow
Air Quality
Hurricane History
17 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Kajiki | Category 2 | — | 232 km |
| 2025 | Bualoi | Category 1 | — | 226 km |
| 2020 | Vamco | Category 1 | — | 262 km |
| 2017 | Doksuri | Category 2 | 92 mph | 144 km |
| 2013 | Wutip | Category 2 | 75 mph | 132 km |
| 2007 | Lekima | Category 1 | 63 mph | 228 km |
| 2006 | Xangsane | Category 1 | 75 mph | 262 km |
| 1995 | Lois | Category 1 | 58 mph | 287 km |
| 1991 | Fred | Category 1 | 69 mph | 218 km |
| 1990 | Becky | Category 1 | 63 mph | 222 km |
| 1989 | Angela | Category 2 | 75 mph | 202 km |
| 1989 | Brian | Category 1 | 58 mph | 290 km |
| 1987 | Cary | Category 1 | 63 mph | 287 km |
| 1987 | Betty | Category 1 | 75 mph | 240 km |
| 1985 | Cecil | Category 2 | 81 mph | 140 km |
| 1985 | Andy | Category 1 | 58 mph | 264 km |
| 1982 | Nancy | Category 1 | 81 mph | 269 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 69°F (20°C) | 0.2 in | Coldest |
| February | 77°F (25°C) | 0.7 in | |
| March | 82°F (28°C) | 1.2 in | |
| April | 85°F (29°C) | 3.3 in | Warmest |
| May | 84°F (29°C) | 7.6 in | |
| June | 83°F (28°C) | 10.8 in | |
| July | 82°F (28°C) | 10.1 in | |
| August | 81°F (27°C) | 14.7 in | Wettest |
| September | 81°F (27°C) | 9.5 in | |
| October | 79°F (26°C) | 3.3 in | |
| November | 75°F (24°C) | 0.4 in | |
| December | 72°F (22°C) | 0.1 in | Driest |
Wan Yai has a seasonal temperature swing of 16°F / from 69°F in January to 85°F in April. Total annual precipitation is 61.9 inches, with August being the wettest month (14.7") and December the driest (0.1").