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Weather & Climate in Siasi, Philippines
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Siasi has a warm climate with an average annual temperature of 80°F (27°C). Winters average 79°F in January while summers reach 81°F in July / relatively mild seasonal variation. The area gets 225 sunny days per year, above the national average. Annual precipitation totals 61.0 inches (wetter than the 38-inch national average). The city sits at an elevation of 26 feet.
Temperature
79°F Jan (26°C)
81°F Jul (27°C)
| Annual Average | 80.2°F |
| 49% above US avg | |
| January Average | 79°F (26°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 225 days/yr |
Geography
| Elevation | 26 ft (8 m) |
| Area | 74.5 sq mi (192.9 km²) |
| Population Density | 169/sq mi |
| Coordinates | 5.5462°N, 120.8145°W |
| Timezone | Asia/Manila |
Precipitation & Snow
Air Quality
Earthquake History
49 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.1.
| Mar 4, 1999 | 69 km S of Tabiauan, Philippines | M7.1 | 125 km | 33 km |
| Feb 25, 2015 | 81 km WSW of Pandan Niog, Philippines | M5.7 | 123 km | 9 km |
| Mar 6, 1999 | Sulu Archipelago, Philippines | M5.2 | 123 km | 33 km |
| Apr 8, 1993 | 36 km W of Pandan Niog, Philippines | M5.2 | 99 km | 46 km |
| Sep 9, 2014 | 49 km S of Manubul, Philippines | M5.1 | 58 km | 15 km |
| Mar 11, 1999 | 59 km SSE of Tabiauan, Philippines | M5.1 | 139 km | 33 km |
| Aug 8, 2004 | 60 km SSE of Sapa, Philippines | M5.0 | 102 km | 34 km |
| Apr 23, 1999 | 61 km S of Tabiauan, Philippines | M5.0 | 130 km | 33 km |
| Mar 10, 2021 | 48 km W of Pandan Niog, Philippines | M4.9 | 113 km | 10 km |
| Mar 6, 1999 | 92 km SSE of Tabiauan, Philippines | M4.9 | 149 km | 33 km |
| Jul 19, 2011 | 37 km SSW of Tabiauan, Philippines | M4.9 | 110 km | 35 km |
| Sep 28, 2017 | 62 km WSW of Pandan Niog, Philippines | M4.9 | 101 km | 51 km |
| Feb 13, 2001 | 59 km S of Tabiauan, Philippines | M4.8 | 125 km | 33 km |
| Jan 6, 2005 | 41 km SSE of Tabiauan, Philippines | M4.8 | 128 km | 81 km |
| Jan 20, 2019 | 41 km SE of Kalang, Philippines | M4.8 | 92 km | 51 km |
| Mar 11, 1999 | 59 km S of Tabiauan, Philippines | M4.8 | 122 km | 33 km |
| Mar 5, 1999 | 63 km S of Tabiauan, Philippines | M4.7 | 126 km | 33 km |
| Jul 10, 2002 | 65 km S of Tabiauan, Philippines | M4.7 | 121 km | 33 km |
| Mar 4, 1999 | 77 km S of Tabiauan, Philippines | M4.7 | 134 km | 33 km |
| Feb 18, 2012 | 17 km ENE of Laminusa, Philippines | M4.7 | 28 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 7.0 m (23 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1897 | SULU SEA | Earthquake | 7.0 m | 13 | 141 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 79°F (26°C) | 3.8 in | Driest |
| February | 79°F (26°C) | 3.8 in | Coldest |
| March | 80°F (27°C) | 3.9 in | |
| April | 80°F (27°C) | 4.2 in | |
| May | 81°F (27°C) | 6.2 in | Warmest |
| June | 81°F (27°C) | 7.6 in | Wettest |
| July | 81°F (27°C) | 5.0 in | |
| August | 81°F (27°C) | 3.8 in | |
| September | 81°F (27°C) | 5.0 in | |
| October | 80°F (27°C) | 6.9 in | |
| November | 80°F (27°C) | 6.7 in | |
| December | 80°F (27°C) | 4.3 in |
Siasi has a seasonal temperature swing of 2°F / from 79°F in February to 81°F in May. Total annual precipitation is 61.0 inches, with June being the wettest month (7.6") and January the driest (3.8").