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Weather & Climate in Si Wilai, Thailand
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Si Wilai has a warm climate with an average annual temperature of 77°F (25°C). Winters average 70°F in January while summers reach 83°F in July / relatively mild seasonal variation. The area gets 322 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 99.8 inches (wetter than the 38-inch national average). The city sits at an elevation of 574 feet.
Temperature
70°F Jan (21°C)
83°F Jul (28°C)
| Annual Average | 76.6°F |
| 42% above US avg | |
| January Average | 70°F (21°C) |
| July Average | 83°F (28°C) |
| Sunny Days | 322 days/yr |
Geography
| Elevation | 574 ft (175 m) |
| Area | 593.9 sq mi (1,538.3 km²) |
| Population Density | 19/sq mi |
| Coordinates | 18.1819°N, 103.7479°W |
| Timezone | Asia/Bangkok |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| May 26, 2015 | 73 km ESE of Muang Phônsavan, Laos | M4.5 | 112 km | 13 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
12 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Kajiki | Category 2 | — | 211 km |
| 2025 | Bualoi | Category 1 | — | 259 km |
| 2017 | Doksuri | Category 1 | 92 mph | 167 km |
| 2013 | Wutip | Category 1 | 69 mph | 126 km |
| 2007 | Lekima | Category 1 | 63 mph | 293 km |
| 1996 | Niki | Category 1 | 63 mph | 281 km |
| 1995 | Lois | Category 1 | 52 mph | 217 km |
| 1991 | Fred | Category 1 | — | 271 km |
| 1990 | Becky | Category 1 | 63 mph | 294 km |
| 1989 | Brian | Category 1 | 58 mph | 288 km |
| 1985 | Cecil | Category 1 | — | 267 km |
| 1982 | Nancy | Category 1 | 81 mph | 215 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 70°F (21°C) | 0.2 in | Driest |
| February | 70°F (21°C) | 0.8 in | |
| March | 75°F (24°C) | 2.3 in | |
| April | 79°F (26°C) | 4.1 in | |
| May | 82°F (28°C) | 14.8 in | |
| June | 83°F (29°C) | 20.0 in | Warmest |
| July | 83°F (28°C) | 23.3 in | Wettest |
| August | 82°F (28°C) | 22.9 in | |
| September | 80°F (27°C) | 13.6 in | |
| October | 78°F (25°C) | 3.6 in | |
| November | 73°F (23°C) | 0.8 in | |
| December | 68°F (20°C) | 0.2 in | Coldest |
Si Wilai has a seasonal temperature swing of 15°F / from 68°F in December to 83°F in June. Total annual precipitation is 106.6 inches, with July being the wettest month (23.3") and January the driest (0.2").