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Monthly climate in Portarlington, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Portarlington features a oceanic climate (Cfb). Temperatures typically range between 11 °C (51 °F) and 20 °C (68 °F) through the year, but rarely can drop to 5 °C (41 °F) or can rise to as high as 36 °C (96 °F). The average annual precipitation amounts to about 667 mm (26.3 inches) and receives 118 rainy days on the 1 mm (0.04 inches) threshold annually. Portarlington enjoys an average of 3149 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 Portarlington, Australia

The warmest months in Portarlington are January, February and March, with daily mean temperatures ranging from 19 to 20 °C (66 - 68 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 11 to 11 °C (51 - 53 °F) throughout the day. On average each year, Portarlington experiences 21 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Portarlington. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum34°C
(93°F)		36°C
(96°F)		30°C
(87°F)		26°C
(80°F)		22°C
(72°F)		16°C
(62°F)		16°C
(61°F)		18°C
(65°F)		23°C
(74°F)		26°C
(79°F)		31°C
(89°F)		35°C
(95°F)
Mean maximum32°C
(89°F)		30°C
(85°F)		28°C
(82°F)		25°C
(77°F)		20°C
(69°F)		15°C
(59°F)		15°C
(60°F)		17°C
(62°F)		21°C
(69°F)		24°C
(75°F)		28°C
(83°F)		30°C
(86°F)
Average high22°C
(73°F)		22°C
(71°F)		21°C
(70°F)		19°C
(66°F)		16°C
(60°F)		13°C
(56°F)		13°C
(55°F)		13°C
(55°F)		15°C
(59°F)		17°C
(62°F)		19°C
(66°F)		20°C
(69°F)
Daily mean20°C
(68°F)		19°C
(67°F)		19°C
(66°F)		16°C
(61°F)		14°C
(57°F)		11°C
(53°F)		11°C
(51°F)		11°C
(52°F)		12°C
(54°F)		14°C
(58°F)		16°C
(61°F)		18°C
(64°F)
Average low17°C
(64°F)		17°C
(62°F)		16°C
(62°F)		14°C
(57°F)		12°C
(53°F)		10°C
(50°F)		9°C
(48°F)		9°C
(48°F)		10°C
(50°F)		12°C
(53°F)		14°C
(57°F)		15°C
(59°F)
Mean minimum15°C
(59°F)		14°C
(57°F)		13°C
(55°F)		11°C
(52°F)		8°C
(47°F)		6°C
(44°F)		6°C
(43°F)		6°C
(43°F)		7°C
(44°F)		9°C
(49°F)		10°C
(50°F)		12°C
(54°F)
Minimum14°C
(57°F)		13°C
(55°F)		11°C
(53°F)		10°C
(50°F)		8°C
(46°F)		5°C
(41°F)		5°C
(42°F)		6°C
(42°F)		6°C
(43°F)		9°C
(48°F)		9°C
(48°F)		10°C
(51°F)

Compare climate in Portarlington with other places

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

Monthly average precipitation in Portarlington, Australia

Portarlington usually has the most precipitation in May, October and November, with an average of 11 rainy days and 67 mm (2.7 inches) of precipitation per month. The driest months in Portarlington are January, March and July. On average, 41 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Portarlington. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)41 (1.6)52 (2.0)43 (1.7)56 (2.2)66 (2.6)58 (2.3)41 (1.6)57 (2.2)57 (2.3)71 (2.8)65 (2.6)61 (2.4)
Average precipitation days (≥ 1 mm)7888111011131112118

Monthly sunshine hours in Portarlington, Australia

The sunniest months in Portarlington are October, November and December, when the sun shines an average of 10 hours 9 minutes a day. Least sunny months in Portarlington: May, June and July receive an average of 6 hours 47 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Portarlington. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours279288282241216193213235263290303341
Mean daily daylight hours14h 27m13h 30m12h 17m11h 4m10h 3m9h 32m9h 47m10h 40m11h 50m13h 4m14h 10m14h 44m

Solar UV radiation in Portarlington, Australia

Portarlington experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 12 - 13, 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 Portarlington UV Index data.

Average daily maximum UV levels by month for Portarlington. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)13121174334791113