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Weather & Climate in Williamstown, Australia
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Williamstown enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 71°F in January while summers reach 49°F in July / relatively mild seasonal variation. The area gets 318 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 21.5 inches (drier than the 38-inch national average). The city sits at an elevation of 935 feet.
Temperature
71°F Jan (22°C)
49°F Jul (9°C)
| Annual Average | 58.9°F |
| 9% above US avg | |
| January Average | 71°F (22°C) |
| July Average | 49°F (9°C) |
| Sunny Days | 318 days/yr |
Geography
| Elevation | 935 ft (285 m) |
| Area | 832.5 sq mi (2,156.1 km²) |
| Population Density | 3/sq mi |
| Coordinates | -34.6721°N, 138.8911°W |
| Timezone | Australia/Adelaide |
Precipitation & Snow
Air Quality
Earthquake History
23 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Mar 5, 1997 | 5 km ESE of Burra, Australia | M4.8 | 111 km | 10 km |
| May 3, 1997 | 32 km WNW of Burra, Australia | M4.8 | 130 km | 33 km |
| May 14, 2020 | 15 km WSW of Burra, Australia | M4.4 | 109 km | 7 km |
| Aug 17, 1991 | 21 km NE of Kapunda, Australia | M4.1 | 56 km | 33 km |
| Mar 5, 1997 | 40 km NNE of Burra, Australia | M4.0 | 149 km | 10 km |
| Mar 5, 2022 | 3 km SW of Mount Barker, Australia | M4.0 | 46 km | 10 km |
| Feb 1, 2017 | 9 km NW of Murray Bridge, Australia | M3.9 | 51 km | 10 km |
| Jan 22, 1999 | 36 km SSE of Burra, Australia | M3.8 | 79 km | 10 km |
| Apr 16, 2010 | 2 km N of Macclesfield, Australia | M3.8 | 53 km | 0 km |
| May 9, 2001 | 28 km SSW of Minlaton, Australia | M3.5 | 134 km | 10 km |
| Apr 4, 2006 | 28 km SSE of Jamestown, Australia | M3.3 | 139 km | 10 km |
| May 23, 2004 | 17 km NE of Nuriootpa, Australia | M3.3 | 42 km | 18 km |
| Oct 18, 2011 | 3 km ESE of Hawthorndene, Australia | M3.3 | 45 km | 17 km |
| May 9, 2001 | near the coast of South Australia | M3.1 | 138 km | 10 km |
| Mar 29, 2022 | 3 km ESE of Macclesfield, Australia | M3.0 | 57 km | 10 km |
| Mar 11, 2000 | 16 km NE of Balaklava, Australia | M3.0 | 78 km | 10 km |
| May 2, 2003 | 26 km ENE of Kadina, Australia | M2.9 | 122 km | 10 km |
| Jul 8, 2007 | 26 km SW of Normanville, Australia | M2.8 | 126 km | 10 km |
| Aug 2, 2004 | 29 km N of Clare, Australia | M2.7 | 126 km | 10 km |
| Sep 22, 2003 | 11 km SSE of Normanville, Australia | M2.7 | 108 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1902 | KANGAROO ISLAND | Earthquake | — | — | 89 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 71°F (22°C) | 1.0 in | Warmest |
| February | 69°F (21°C) | 0.8 in | Driest |
| March | 65°F (18°C) | 1.2 in | |
| April | 59°F (15°C) | 2.1 in | |
| May | 54°F (12°C) | 3.0 in | |
| June | 49°F (9°C) | 3.9 in | |
| July | 49°F (9°C) | 4.5 in | Coldest, Wettest |
| August | 49°F (9°C) | 4.2 in | |
| September | 52°F (11°C) | 3.6 in | |
| October | 56°F (13°C) | 2.6 in | |
| November | 60°F (16°C) | 1.5 in | |
| December | 65°F (18°C) | 1.3 in |
Williamstown has a seasonal temperature swing of 22°F / from 49°F in July to 71°F in January. Total annual precipitation is 29.7 inches, with July being the wettest month (4.5") and February the driest (0.8").