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Weather & Climate in Onslow, Australia
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Onslow has a warm climate with an average annual temperature of 78°F (25°C). Winters average 87°F in January while summers reach 66°F in July / relatively mild seasonal variation. The area gets 314 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 12.1 inches (drier than the 38-inch national average). The city sits at an elevation of 23 feet.
Temperature
87°F Jan (30°C)
66°F Jul (19°C)
| Annual Average | 77.6°F |
| 44% above US avg | |
| January Average | 87°F (30°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 314 days/yr |
Geography
| Elevation | 23 ft (7 m) |
| Area | 71.5 sq mi (185.2 km²) |
| Population Density | 16/sq mi |
| Coordinates | -21.6376°N, 115.1122°W |
| Timezone | Australia/Perth |
Precipitation & Snow
Air Quality
Earthquake History
3 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.
| Feb 10, 2020 | 23 km NNW of Onslow, Australia | M4.3 | 24 km | 10 km |
| Mar 19, 2005 | 127 km W of Dampier, Australia | M3.7 | 137 km | 37 km |
| Sep 24, 2000 | 59 km SSW of Onslow, Australia | M3.3 | 60 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
28 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2026 | Narelle | Category 4 | — | 130 km |
| 2026 | Mitchell | Category 1 | — | 65 km |
| 2025 | Sean | Category 2 | 98 mph | 176 km |
| 2020 | Damien | Category 2 | 98 mph | 193 km |
| 2019 | Veronica | Category 4 | 109 mph | 293 km |
| 2015 | Quang | Category 3 | 75 mph | 161 km |
| 2015 | Olwyn | Category 2 | 86 mph | 125 km |
| 2014 | Christine | Category 3 | 104 mph | 196 km |
| 2011 | Bianca | Category 2 | 86 mph | 197 km |
| 2011 | Carlos | Category 1 | 63 mph | 300 km |
| 2008 | Nicholas | Category 1 | 92 mph | 178 km |
| 2006 | Glenda | Category 3 | 115 mph | 7 km |
| 2004 | Monty | Category 3 | 115 mph | 78 km |
| 2000 | John | Category 4 | 127 mph | 269 km |
| 2000 | Steve | Category 1 | 69 mph | 146 km |
| 1999 | Vance | Category 4 | 127 mph | 75 km |
| 1998 | Tiffany | Category 4 | 109 mph | 272 km |
| 1996 | Olivia | Category 4 | 121 mph | 101 km |
| 1996 | Frank | Category 4 | 109 mph | 156 km |
| 1996 | Jacob | Category 2 | 98 mph | 201 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 87°F (30°C) | 1.2 in | |
| February | 87°F (31°C) | 2.9 in | Warmest, Wettest |
| March | 86°F (30°C) | 1.5 in | |
| April | 82°F (28°C) | 0.9 in | |
| May | 74°F (23°C) | 2.2 in | |
| June | 68°F (20°C) | 1.9 in | |
| July | 66°F (19°C) | 0.7 in | Coldest |
| August | 68°F (20°C) | 0.3 in | |
| September | 72°F (22°C) | 0.1 in | |
| October | 77°F (25°C) | 0.0 in | |
| November | 80°F (27°C) | 0.0 in | Driest |
| December | 84°F (29°C) | 0.4 in |
Onslow has a seasonal temperature swing of 21°F / from 66°F in July to 87°F in February. Total annual precipitation is 12.1 inches, with February being the wettest month (2.9") and November the driest (0.0").