All Countries
Weather & Climate in San Sai, Thailand
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Sai has a warm climate with an average annual temperature of 78°F (25°C). Winters average 71°F in January while summers reach 81°F in July / relatively mild seasonal variation. The area gets 341 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 86.6 inches (wetter than the 38-inch national average). The city sits at an elevation of 1,037 feet.
Temperature
71°F Jan (22°C)
81°F Jul (27°C)
| Annual Average | 77.7°F |
| 44% above US avg | |
| January Average | 71°F (22°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 341 days/yr |
Geography
| Elevation | 1,037 ft (316 m) |
| Area | 156.4 sq mi (405.0 km²) |
| Population Density | 47/sq mi |
| Coordinates | 18.8479°N, 99.0451°W |
| Timezone | Asia/Bangkok |
Precipitation & Snow
Air Quality
Earthquake History
34 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.1.
| May 5, 2014 | 32 km SSW of Chiang Rai, Thailand | M6.1 | 111 km | 6 km |
| Sep 11, 1994 | 41 km NW of Mae Chai, Thailand | M5.2 | 96 km | 33 km |
| May 6, 2014 | 31 km SW of Chiang Rai, Thailand | M5.0 | 113 km | 10 km |
| May 6, 2014 | 42 km SE of Fang, Thailand | M5.0 | 97 km | 10 km |
| May 5, 2014 | 32 km SSW of Chiang Rai, Thailand | M4.6 | 112 km | 10 km |
| May 6, 2014 | 40 km SW of Chiang Rai, Thailand | M4.6 | 106 km | 10 km |
| Feb 20, 2019 | 26 km SW of Mae Chai, Thailand | M4.6 | 71 km | 10 km |
| May 7, 2014 | 38 km SW of Chiang Rai, Thailand | M4.5 | 106 km | 10 km |
| Aug 24, 2014 | 44 km SSE of Fang, Thailand | M4.5 | 92 km | 20 km |
| Dec 21, 1995 | 52 km SSW of Fang, Thailand | M4.5 | 68 km | 41 km |
| May 5, 2014 | 27 km SW of Chiang Rai, Thailand | M4.4 | 118 km | 10 km |
| May 5, 2014 | 31 km SSW of Chiang Rai, Thailand | M4.4 | 113 km | 10 km |
| Nov 11, 2001 | 13 km W of Pa Daet, Thailand | M4.4 | 113 km | 33 km |
| May 5, 2014 | 33 km SSW of Chiang Rai, Thailand | M4.3 | 112 km | 10 km |
| May 5, 2014 | 38 km NW of Mae Chai, Thailand | M4.3 | 105 km | 10 km |
| May 12, 2014 | 29 km SSW of Chiang Rai, Thailand | M4.3 | 115 km | 10 km |
| May 6, 2014 | 39 km NW of Mae Chai, Thailand | M4.3 | 98 km | 10 km |
| Jan 7, 1990 | 54 km WNW of Fang, Thailand | M4.3 | 147 km | 50 km |
| Jun 2, 2025 | 43 km NNE of Chiang Mai, Thailand | M4.2 | 35 km | 10 km |
| May 6, 2014 | 40 km SE of Fang, Thailand | M4.2 | 103 km | 12 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 71°F (22°C) | 0.1 in | Driest |
| February | 74°F (23°C) | 0.2 in | |
| March | 80°F (26°C) | 0.8 in | |
| April | 84°F (29°C) | 1.9 in | Warmest |
| May | 83°F (28°C) | 6.1 in | |
| June | 82°F (28°C) | 4.4 in | |
| July | 81°F (27°C) | 5.3 in | |
| August | 80°F (27°C) | 7.3 in | Wettest |
| September | 80°F (26°C) | 7.0 in | |
| October | 78°F (26°C) | 4.3 in | |
| November | 74°F (23°C) | 1.7 in | |
| December | 70°F (21°C) | 0.4 in | Coldest |
San Sai has a seasonal temperature swing of 14°F / from 70°F in December to 84°F in April. Total annual precipitation is 39.5 inches, with August being the wettest month (7.3") and January the driest (0.1").