Si Thep Historical Park
Thailand UNESCO World Heritage Site

Si Thep Historical Park is a historical park in Thailand and a UNESCO World Heritage Site. It is one of the 36 sights of Thailand featured on this site and is the 21st most looked-up sight in the country on English Wikipedia.
Planning a visit
The best time to visit is between December and February, when temperatures are lower and rainfall is minimal. From January, daily highs are around 31 °C and lows are about 20 °C, with only about 2 to 3 rainy days per month. In contrast, the months from May to October are much wetter, with September seeing the most rain at about 254 mm over 25 days.
The park is about 203 km from Bangkok. Travelers can reach the area via Phetchabun Airport, which is 135 km away, or via Don Mueang International Airport in Bangkok, located 182 km from the site.
Weather by month
The warmest month is April, with an average high of 36 °C. The wettest is September, with about 254 mm of rain.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high, °C | 31 | 33 | 35 | 36 | 34 | 33 | 32 | 31 | 31 | 30 | 30 | 30 |
| Average low, °C | 20 | 22 | 24 | 26 | 26 | 25 | 25 | 24 | 24 | 23 | 21 | 19 |
| Rainfall, mm | 6 | 8 | 47 | 88 | 147 | 134 | 140 | 195 | 254 | 130 | 23 | 4 |
| Rainy days | 2 | 3 | 9 | 11 | 20 | 21 | 24 | 24 | 25 | 18 | 5 | 1 |
Temperatures and rainfall: 1981–2010 averages for this spot (4 km grid), from CHELSA. Rainy days: 2015–2024, NASA POWER.