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Weather & Climate in Siayan, Philippines
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Siayan has a warm climate with an average annual temperature of 80°F (27°C). Winters average 79°F in January while summers reach 80°F in July / relatively mild seasonal variation. The area gets 150 sunny days per year, below the national average of 205. Annual precipitation totals 103.1 inches (wetter than the 38-inch national average). The city sits at an elevation of 194 feet.
Temperature
79°F Jan (26°C)
80°F Jul (27°C)
| Annual Average | 80.3°F |
| 49% above US avg | |
| January Average | 79°F (26°C) |
| July Average | 80°F (27°C) |
| Sunny Days | 150 days/yr |
Geography
| Elevation | 194 ft (59 m) |
| Area | 174.1 sq mi (451.0 km²) |
| Population Density | 28/sq mi |
| Coordinates | 8.2667°N, 123.1000°W |
| Timezone | Asia/Manila |
Precipitation & Snow
Air Quality
Earthquake History
204 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.
| Apr 13, 2016 | 15 km NW of Siocon, Philippines | M6.0 | 130 km | 17 km |
| May 23, 1998 | 6 km WNW of Tabid, Philippines | M6.0 | 70 km | 658 km |
| May 13, 1994 | 6 km SW of Balagon, Philippines | M5.9 | 34 km | 33 km |
| Oct 16, 1993 | 2 km NE of Malim, Philippines | M5.8 | 96 km | 31 km |
| Jul 23, 2010 | 29 km W of Litayan, Philippines | M5.8 | 128 km | 602 km |
| Feb 23, 1991 | 44 km WNW of Kalawit, Philippines | M5.7 | 107 km | 54 km |
| Oct 18, 1991 | 12 km N of Siocon, Philippines | M5.6 | 118 km | 36 km |
| Jun 14, 2002 | 5 km W of Malabang, Philippines | M5.6 | 126 km | 33 km |
| Feb 26, 2004 | 9 km NNW of Josefina, Philippines | M5.5 | 46 km | 12 km |
| Jan 7, 2019 | 27 km NW of Siocon, Philippines | M5.5 | 134 km | 19 km |
| Sep 8, 1999 | 44 km SE of Malim, Philippines | M5.5 | 141 km | 118 km |
| Apr 28, 1992 | 50 km NW of Matangad, Philippines | M5.4 | 129 km | 568 km |
| Jun 6, 1995 | 39 km SE of Malim, Philippines | M5.4 | 135 km | 34 km |
| Jan 23, 2025 | 8 km E of Siocon, Philippines | M5.4 | 117 km | 62 km |
| Oct 2, 2012 | 15 km NNW of Dumingag, Philippines | M5.3 | 21 km | 52 km |
| Jun 1, 2018 | 32 km ESE of Malim, Philippines | M5.3 | 125 km | 575 km |
| Oct 1, 2011 | 30 km ESE of Malim, Philippines | M5.3 | 120 km | 615 km |
| Aug 2, 2015 | 2 km SSW of Lapase, Philippines | M5.2 | 84 km | 603 km |
| May 9, 1995 | 31 km W of Litayan, Philippines | M5.1 | 125 km | 33 km |
| Mar 31, 2000 | 22 km ESE of San Pablo, Philippines | M5.1 | 99 km | 678 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
10 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Kalmaegi | Category 2 | — | 246 km |
| 2021 | Rai | Category 4 | 109 mph | 205 km |
| 2012 | Bopha | Category 3 | 81 mph | 85 km |
| 1995 | Zack | Category 2 | 63 mph | 282 km |
| 1994 | Owen | Category 1 | 69 mph | 253 km |
| 1993 | Nell | Category 1 | 69 mph | 262 km |
| 1990 | Mike | Category 4 | 98 mph | 260 km |
| 1986 | Marge | Category 1 | 69 mph | 253 km |
| 1984 | Ike | Category 4 | 104 mph | 211 km |
| 1982 | Nelson | Category 3 | 104 mph | 276 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.0 m (0 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1978 | MINDANAO ISLAND, PHILIPPINES | Earthquake | 0.0 m | — | 77 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Cuernos de Negros (110 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Cuernos de Negros | Complex | 1,862 m (6,109 ft) | Unknown | 110 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 79°F (26°C) | 4.0 in | Coldest |
| February | 80°F (26°C) | 3.1 in | Driest |
| March | 81°F (27°C) | 3.7 in | |
| April | 82°F (28°C) | 4.4 in | Warmest |
| May | 82°F (28°C) | 9.1 in | |
| June | 81°F (27°C) | 13.4 in | Wettest |
| July | 80°F (27°C) | 12.2 in | |
| August | 80°F (27°C) | 11.7 in | |
| September | 80°F (27°C) | 11.9 in | |
| October | 80°F (27°C) | 12.1 in | |
| November | 80°F (27°C) | 11.1 in | |
| December | 80°F (27°C) | 6.3 in |
Siayan has a seasonal temperature swing of 3°F / from 79°F in January to 82°F in April. Total annual precipitation is 103.1 inches, with June being the wettest month (13.4") and February the driest (3.1").