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Weather & Climate in Apra Harbor, Guam
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Apra Harbor has a warm climate with an average annual temperature of 80°F (27°C). Winters average 78°F in January while summers reach 81°F in July / relatively mild seasonal variation. The area gets 176 sunny days per year. Annual precipitation totals 90.7 inches (wetter than the 38-inch national average). The city sits at an elevation of 7 feet.
Temperature
78°F Jan (26°C)
81°F Jul (27°C)
| Annual Average | 80.0°F |
| 48% above US avg | |
| January Average | 78°F (26°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 176 days/yr |
Geography
| Elevation | 7 ft (2 m) |
| Area | 32.4 sq mi (84.0 km²) |
| Population Density | 90/sq mi |
| Coordinates | 13.4283°N, 144.6525°W |
| Timezone | Pacific/Guam |
Precipitation & Snow
Air Quality
Earthquake History
1,957 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.8.
| Aug 8, 1993 | 32 km S of Inarajan Village, Guam | M7.8 | 52 km | 59 km |
| Apr 26, 2002 | 20 km SSW of Merizo Village, Guam | M7.1 | 38 km | 86 km |
| Oct 12, 2001 | 69 km SSE of Inarajan Village, Guam | M7.0 | 90 km | 37 km |
| Apr 23, 1997 | 49 km N of Yigo Village, Guam | M6.5 | 68 km | 101 km |
| Feb 2, 2005 | 63 km NNW of Yigo Village, Guam | M6.3 | 73 km | 159 km |
| Aug 11, 1993 | 91 km ESE of Yigo Village, Guam | M6.2 | 112 km | 22 km |
| Feb 26, 2000 | 30 km NNW of Yigo Village, Guam | M6.2 | 43 km | 132 km |
| Feb 10, 1991 | 54 km NNW of Yigo Village, Guam | M6.0 | 65 km | 156 km |
| May 15, 1998 | 71 km N of Yigo Village, Guam | M6.0 | 87 km | 154 km |
| Dec 19, 1999 | 45 km SSW of Merizo Village, Guam | M6.0 | 63 km | 51 km |
| Aug 16, 1993 | 41 km SE of Inarajan Village, Guam | M6.0 | 62 km | 18 km |
| May 9, 1997 | 8 km SSE of Merizo Village, Guam | M6.0 | 26 km | 29 km |
| Aug 10, 2025 | 103 km ESE of Inarajan Village, Guam | M5.9 | 120 km | 16 km |
| Jun 23, 2020 | 91 km NE of Yigo Village, Guam | M5.9 | 119 km | 65 km |
| Jun 21, 2000 | 64 km N of Yigo Village, Guam | M5.9 | 83 km | 112 km |
| Jun 29, 2000 | 29 km SSW of Merizo Village, Guam | M5.9 | 46 km | 52 km |
| Sep 9, 1991 | 96 km SW of Merizo Village, Guam | M5.8 | 109 km | 30 km |
| Jan 2, 1990 | 23 km W of Agat Village, Guam | M5.8 | 23 km | 136 km |
| Feb 12, 2002 | 50 km N of Yigo Village, Guam | M5.8 | 66 km | 121 km |
| Aug 30, 1997 | 90 km WSW of San Jose Village, Northern Mariana Islands | M5.8 | 142 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
54 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2023 | Mawar | Category 5 | 127 mph | 42 km |
| 2023 | Bolaven | Category 3 | 98 mph | 141 km |
| 2019 | Wutip | Category 5 | 121 mph | 256 km |
| 2018 | Yutu | Category 5 | 132 mph | 214 km |
| 2018 | Mangkhut | Category 4 | 104 mph | 89 km |
| 2018 | Maria | Category 4 | 98 mph | 141 km |
| 2015 | In-fa | Category 4 | 109 mph | 271 km |
| 2015 | Dolphin | Category 4 | 109 mph | 64 km |
| 2015 | Soudelor | Category 3 | 98 mph | 227 km |
| 2015 | Goni | Category 2 | 86 mph | 192 km |
| 2014 | Vongfong | Category 2 | 69 mph | 123 km |
| 2013 | Francisco | Category 4 | 109 mph | 214 km |
| 2009 | Nida | Category 5 | 121 mph | 267 km |
| 2007 | Kong-rey | Category 1 | 75 mph | 300 km |
| 2005 | Nabi | Category 2 | 92 mph | 300 km |
| 2004 | Chaba | Category 5 | 127 mph | 139 km |
| 2004 | Nock-ten | Category 2 | 86 mph | 235 km |
| 2003 | Kujira | Category 4 | 92 mph | 275 km |
| 2002 | Pongsona | Category 4 | 104 mph | 59 km |
| 2002 | Chataan | Category 3 | 98 mph | 38 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 2.4 m (8 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1993 | GUAM, MARIANA ISLANDS | Earthquake | 2.4 m | — | 52 km |
| 1909 | GUAM, MARIANA ISLANDS | Earthquake | — | — | 110 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: NW Rota-1 (131 km).
| Name | Type | Elevation | Last Eruption | Distance |
| NW Rota-1 | Submarine | -517 m (-1,696 ft) | 2010 | 131 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 78°F (26°C) | 4.8 in | Coldest |
| February | 78°F (26°C) | 3.7 in | |
| March | 79°F (26°C) | 3.1 in | Driest |
| April | 80°F (27°C) | 3.2 in | |
| May | 81°F (27°C) | 4.8 in | |
| June | 81°F (27°C) | 6.4 in | Warmest |
| July | 81°F (27°C) | 9.6 in | |
| August | 80°F (27°C) | 15.0 in | Wettest |
| September | 81°F (27°C) | 12.4 in | |
| October | 81°F (27°C) | 12.1 in | |
| November | 80°F (27°C) | 9.1 in | |
| December | 79°F (26°C) | 6.6 in |
Apra Harbor has a seasonal temperature swing of 3°F / from 78°F in January to 81°F in June. Total annual precipitation is 90.7 inches, with August being the wettest month (15.0") and March the driest (3.1").