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Weather & Climate in Si Ma Cai, Vietnam
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Si Ma Cai enjoys a temperate climate with an average annual temperature of 67°F (19°C). Winters average 54°F in January while summers reach 76°F in July. The area gets 223 sunny days per year, above the national average. Annual precipitation totals 65.2 inches (wetter than the 38-inch national average). The city sits at an elevation of 3,494 feet.
Temperature
54°F Jan (12°C)
76°F Jul (24°C)
| Annual Average | 66.6°F |
| 23% above US avg | |
| January Average | 54°F (12°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 223 days/yr |
Geography
| Elevation | 3,494 ft (1,065 m) |
| Area | 40.8 sq mi (105.7 km²) |
| Population Density | 139/sq mi |
| Coordinates | 22.6951°N, 104.2786°W |
| Timezone | Asia/Bangkok |
Precipitation & Snow
Air Quality
Earthquake History
20 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.2.
| Apr 24, 1995 | 73 km SSW of Gejiu, China | M5.2 | 141 km | 33 km |
| Aug 13, 2005 | 32 km NNW of Wenshan City, China | M4.8 | 105 km | 10 km |
| Jul 19, 2014 | 19 km NNE of S?n La, Vietnam | M4.6 | 138 km | 17 km |
| Oct 6, 1991 | 33 km E of S?n La, Vietnam | M4.5 | 146 km | 10 km |
| May 4, 2016 | 19 km SE of Gejiu, China | M4.5 | 118 km | 15 km |
| Feb 24, 2016 | 55 km WSW of Sa Pa, Vietnam | M4.5 | 112 km | 10 km |
| May 4, 2016 | 20 km ESE of Gejiu, China | M4.5 | 117 km | 16 km |
| Apr 2, 2001 | 74 km WSW of Sa Pa, Vietnam | M4.4 | 132 km | 33 km |
| Nov 28, 2001 | 82 km W of Sa Pa, Vietnam | M4.3 | 128 km | 33 km |
| Dec 21, 1993 | 62 km WSW of Sa Pa, Vietnam | M4.3 | 118 km | 10 km |
| May 24, 2017 | 22 km ESE of Kaiyuan, China | M4.3 | 130 km | 10 km |
| Aug 7, 1992 | 40 km SW of Wenshan City, China | M4.3 | 63 km | 10 km |
| Jan 1, 2004 | 18 km WSW of Gejiu, China | M4.2 | 147 km | 18 km |
| Jul 19, 2005 | 23 km NNW of Wenshan City, China | M4.2 | 96 km | 10 km |
| May 4, 2016 | 18 km SE of Gejiu, China | M4.2 | 119 km | 14 km |
| May 21, 2011 | 51 km NW of Lào Cai, Vietnam | M4.1 | 69 km | 10 km |
| Feb 2, 1996 | 72 km WSW of Sa Pa, Vietnam | M4.1 | 130 km | 33 km |
| Oct 23, 1993 | 20 km SSW of Yên Bái, Vietnam | M4.1 | 142 km | 33 km |
| Oct 11, 1991 | 11 km N of Tuyên Quang, Vietnam | M4.1 | 129 km | 10 km |
| Apr 22, 1997 | 33 km NNE of Hà Giang, Vietnam | M3.6 | 92 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
4 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Yagi | Category 3 | 104 mph | 239 km |
| 2014 | Rammasun | Category 1 | 46 mph | 260 km |
| 2014 | Kalmaegi | Category 1 | 63 mph | 254 km |
| 1997 | Zita | Category 1 | 46 mph | 251 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 54°F (12°C) | 0.4 in | Coldest, Driest |
| February | 56°F (14°C) | 1.2 in | |
| March | 63°F (17°C) | 1.3 in | |
| April | 69°F (21°C) | 4.1 in | |
| May | 73°F (23°C) | 7.2 in | |
| June | 75°F (24°C) | 9.1 in | |
| July | 76°F (24°C) | 15.7 in | Warmest, Wettest |
| August | 75°F (24°C) | 11.8 in | |
| September | 73°F (23°C) | 7.5 in | |
| October | 68°F (20°C) | 4.1 in | |
| November | 61°F (16°C) | 2.1 in | |
| December | 56°F (13°C) | 0.8 in |
Si Ma Cai has a seasonal temperature swing of 22°F / from 54°F in January to 76°F in July. Total annual precipitation is 65.2 inches, with July being the wettest month (15.7") and January the driest (0.4").