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Weather & Climate in Mortlake, Australia
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mortlake enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 65°F in January while summers reach 48°F in July / relatively mild seasonal variation. The area gets 288 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 26.6 inches (drier than the 38-inch national average). The city sits at an elevation of 449 feet.
Temperature
65°F Jan (18°C)
48°F Jul (9°C)
| Annual Average | 56.1°F |
| 4% above US avg | |
| January Average | 65°F (18°C) |
| July Average | 48°F (9°C) |
| Sunny Days | 288 days/yr |
Geography
| Elevation | 449 ft (137 m) |
| Area | 69.7 sq mi (180.5 km²) |
| Population Density | 19/sq mi |
| Coordinates | -38.0810°N, 142.8083°W |
| Timezone | Australia/Melbourne |
Precipitation & Snow
Air Quality
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Jun 1, 2011 | 45 km NE of Hamilton, Australia | M3.8 | 74 km | 2 km |
| Nov 8, 1992 | 20 km NNE of Colac, Australia | M3.6 | 80 km | 10 km |
| Jun 30, 2005 | 59 km S of Port Fairy, Australia | M3.5 | 104 km | 0 km |
| May 1, 2013 | 7 km NW of Clifton Springs, Australia | M3.1 | 147 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Nearby Volcanoes
1 volcano within 200 km. Closest: Newer Volcanics Province (44 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Newer Volcanics Province | Shield(s) | 1,011 m (3,317 ft) | -2900 | 44 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 65°F (18°C) | 1.3 in | Driest |
| February | 66°F (19°C) | 1.3 in | Warmest |
| March | 63°F (17°C) | 1.7 in | |
| April | 57°F (14°C) | 2.0 in | |
| May | 53°F (12°C) | 2.6 in | |
| June | 49°F (9°C) | 2.8 in | |
| July | 48°F (9°C) | 2.7 in | Coldest |
| August | 49°F (9°C) | 2.9 in | |
| September | 51°F (11°C) | 3.1 in | Wettest |
| October | 54°F (12°C) | 2.3 in | |
| November | 57°F (14°C) | 2.1 in | |
| December | 61°F (16°C) | 1.8 in |
Mortlake has a seasonal temperature swing of 18°F / from 48°F in July to 66°F in February. Total annual precipitation is 26.6 inches, with September being the wettest month (3.1") and January the driest (1.3").