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Weather & Climate in Siao, Thailand
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Siao has a warm climate with an average annual temperature of 80°F (27°C). Winters average 72°F in January while summers reach 81°F in July / relatively mild seasonal variation. The area gets 334 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 69.6 inches (wetter than the 38-inch national average). The city sits at an elevation of 472 feet.
Temperature
72°F Jan (22°C)
81°F Jul (27°C)
| Annual Average | 80.3°F |
| 49% above US avg | |
| January Average | 72°F (22°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 334 days/yr |
Geography
| Elevation | 472 ft (144 m) |
| Area | 308.1 sq mi (798.1 km²) |
| Population Density | 0/sq mi |
| Coordinates | 14.7958°N, 104.6702°W |
| Timezone | Asia/Bangkok |
Precipitation & Snow
Air Quality
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2006 | Xangsane | Category 1 | 75 mph | 255 km |
| 1985 | Cecil | Category 2 | 81 mph | 293 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 72°F (22°C) | 0.1 in | Coldest, Driest |
| February | 79°F (26°C) | 0.4 in | |
| March | 84°F (29°C) | 1.2 in | |
| April | 85°F (30°C) | 3.2 in | Warmest |
| May | 84°F (29°C) | 7.6 in | |
| June | 82°F (28°C) | 9.4 in | |
| July | 81°F (27°C) | 9.3 in | |
| August | 81°F (27°C) | 11.3 in | Wettest |
| September | 81°F (27°C) | 11.3 in | |
| October | 80°F (27°C) | 5.1 in | |
| November | 77°F (25°C) | 1.2 in | |
| December | 75°F (24°C) | 0.1 in |
Siao has a seasonal temperature swing of 14°F / from 72°F in January to 85°F in April. Total annual precipitation is 60.2 inches, with August being the wettest month (11.3") and January the driest (0.1").