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Monthly climate in Portland, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Portland features a oceanic climate (Cfb). Temperatures typically range between 6 °C (43 °F) and 21 °C (70 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 38 °C (100 °F). The average annual precipitation amounts to about 642 mm (25.3 inches) and receives 89 rainy days on the 1 mm (0.04 inches) threshold annually. Portland enjoys an average of 3194 hours of sunshine throughout the year, and daylight varies from 9 hours 57 minutes to 14 hours 18 minutes per day.

Monthly average temperatures in Portland, Australia

The warmest months in Portland are January, February and December, with daily mean temperatures ranging from 19 to 21 °C (66 - 70 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 6 to 7 °C (43 - 44 °F) throughout the day. On average each year, Portland experiences 67 days above 25 °C (77.0 °F) and 24 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Portland. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum38°C
(100°F)		38°C
(100°F)		32°C
(90°F)		28°C
(83°F)		21°C
(71°F)		19°C
(66°F)		18°C
(65°F)		20°C
(68°F)		27°C
(82°F)		28°C
(83°F)		33°C
(92°F)		37°C
(99°F)
Mean maximum34°C
(94°F)		33°C
(91°F)		29°C
(85°F)		25°C
(77°F)		20°C
(68°F)		14°C
(58°F)		16°C
(62°F)		18°C
(65°F)		24°C
(75°F)		26°C
(79°F)		29°C
(84°F)		33°C
(92°F)
Average high27°C
(81°F)		25°C
(77°F)		22°C
(72°F)		19°C
(67°F)		15°C
(59°F)		12°C
(54°F)		12°C
(53°F)		12°C
(54°F)		16°C
(62°F)		20°C
(68°F)		22°C
(72°F)		25°C
(77°F)
Daily mean21°C
(70°F)		19°C
(66°F)		17°C
(63°F)		13°C
(56°F)		9°C
(49°F)		7°C
(44°F)		6°C
(43°F)		6°C
(44°F)		10°C
(50°F)		14°C
(57°F)		16°C
(61°F)		19°C
(66°F)
Average low15°C
(60°F)		14°C
(57°F)		13°C
(55°F)		8°C
(47°F)		5°C
(41°F)		3°C
(37°F)		1°C
(35°F)		1°C
(35°F)		4°C
(39°F)		8°C
(46°F)		10°C
(50°F)		13°C
(55°F)
Mean minimum11°C
(51°F)		8°C
(47°F)		7°C
(44°F)		3°C
(38°F)		-1°C
(30°F)		-2°C
(29°F)		-4°C
(26°F)		-3°C
(26°F)		-2°C
(29°F)		2°C
(35°F)		4°C
(39°F)		7°C
(45°F)
Minimum8°C
(46°F)		5°C
(42°F)		3°C
(38°F)		-0°C
(32°F)		-3°C
(27°F)		-4°C
(24°F)		-5°C
(24°F)		-4°C
(25°F)		-4°C
(26°F)		0°C
(33°F)		3°C
(38°F)		5°C
(41°F)

Compare climate in Portland with other places

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

Monthly average precipitation in Portland, Australia

Portland usually has the most precipitation in March, November and December, with an average of 11 rainy days and 92 mm (3.6 inches) of precipitation per month. The driest months in Portland are April, May and June. On average, 26 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Portland. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)44 (1.7)72 (2.8)113 (4.4)23 (0.9)26 (1.0)28 (1.1)33 (1.3)46 (1.8)35 (1.4)57 (2.3)88 (3.5)76 (3.0)
Average precipitation days (≥ 1 mm)71012354575101110

Monthly sunshine hours in Portland, Australia

The sunniest months in Portland are October, November and December, when the sun shines an average of 9 hours 53 minutes a day. Least sunny months in Portland: May, June and July receive an average of 7 hours 17 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Portland. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours266277269260236201232262277287299323
Mean daily daylight hours14h 4m13h 16m12h 15m11h 13m10h 23m9h 57m10h 10m10h 54m11h 53m12h 54m13h 49m14h 18m

Solar UV radiation in Portland, Australia

Portland experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure. May, June and July are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Portland UV Index data.

Average daily maximum UV levels by month for Portland. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)151412864468111315