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Monthly climate in Mortlake, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Mortlake features a oceanic climate (Cfb). Temperatures typically range between 9 °C (48 °F) and 19 °C (67 °F) through the year, but rarely can drop to -3 °C (28 °F) or can rise to as high as 43 °C (109 °F). The average annual precipitation amounts to about 661 mm (26.0 inches) and receives 107 rainy days on the 1 mm (0.04 inches) threshold annually. Mortlake enjoys an average of 3097 hours of sunshine throughout the year, and daylight varies from 9 hours 32 minutes to 14 hours 44 minutes per day.

Monthly average temperatures in Mortlake, Australia

The warmest months in Mortlake are January, February and March, with daily mean temperatures ranging from 17 to 19 °C (63 - 67 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 9 to 9 °C (48 - 48 °F) throughout the day. On average each year, Mortlake experiences 59 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Mortlake. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum41°C
(105°F)		39°C
(102°F)		37°C
(100°F)		32°C
(90°F)		23°C
(74°F)		18°C
(64°F)		17°C
(64°F)		20°C
(67°F)		26°C
(78°F)		32°C
(89°F)		34°C
(93°F)		43°C
(109°F)
Mean maximum38°C
(101°F)		36°C
(96°F)		33°C
(92°F)		28°C
(83°F)		21°C
(70°F)		15°C
(60°F)		16°C
(62°F)		17°C
(64°F)		23°C
(74°F)		28°C
(83°F)		32°C
(89°F)		37°C
(99°F)
Average high26°C
(80°F)		24°C
(76°F)		23°C
(74°F)		19°C
(67°F)		15°C
(60°F)		13°C
(56°F)		12°C
(54°F)		13°C
(55°F)		15°C
(59°F)		18°C
(64°F)		21°C
(70°F)		23°C
(74°F)
Daily mean19°C
(67°F)		18°C
(64°F)		17°C
(63°F)		14°C
(58°F)		11°C
(52°F)		9°C
(48°F)		9°C
(48°F)		9°C
(48°F)		10°C
(51°F)		13°C
(55°F)		15°C
(59°F)		17°C
(62°F)
Average low13°C
(55°F)		12°C
(54°F)		12°C
(54°F)		10°C
(49°F)		7°C
(46°F)		6°C
(43°F)		6°C
(42°F)		5°C
(42°F)		6°C
(43°F)		7°C
(46°F)		9°C
(49°F)		10°C
(51°F)
Mean minimum7°C
(45°F)		6°C
(43°F)		6°C
(43°F)		4°C
(40°F)		2°C
(36°F)		1°C
(34°F)		0°C
(33°F)		1°C
(34°F)		-0°C
(32°F)		2°C
(36°F)		3°C
(38°F)		5°C
(41°F)
Minimum5°C
(42°F)		4°C
(40°F)		5°C
(40°F)		3°C
(37°F)		-0°C
(31°F)		-0°C
(32°F)		-2°C
(29°F)		-1°C
(31°F)		-3°C
(28°F)		0°C
(32°F)		1°C
(35°F)		3°C
(37°F)

Compare climate in Mortlake with other places

Compare temperature, precipitation, sunshine, UV index in Mortlake, Australia with other places around the world.

Monthly average precipitation in Mortlake, Australia

Mortlake usually has the most precipitation in September, October and November, with an average of 10 rainy days and 72 mm (2.8 inches) of precipitation per month. The driest months in Mortlake are January, February and June. On average, 37 mm (1.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Mortlake. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)40 (1.6)32 (1.2)41 (1.6)51 (2.0)69 (2.7)40 (1.6)58 (2.3)69 (2.7)69 (2.7)74 (2.9)73 (2.9)46 (1.8)
Average precipitation days (≥ 1 mm)35771191215121196

Monthly sunshine hours in Mortlake, Australia

The sunniest months in Mortlake are February, November and December, when the sun shines an average of 10 hours 19 minutes a day. Least sunny months in Mortlake: May, June and July receive an average of 6 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Mortlake. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours285287284231207190206228255278304336
Mean daily daylight hours14h 27m13h 30m12h 17m11h 4m10h 3m9h 32m9h 48m10h 40m11h 50m13h 4m14h 10m14h 44m

Solar UV radiation in Mortlake, Australia

Mortlake experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 12 - 14, which corresponds to the Extreme category of sun exposure. May, June and July are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Mortlake UV Index data.

Average daily maximum UV levels by month for Mortlake. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)14121174335791214