Last updated: May 6, 2024
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.
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).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 38°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 maximum | 34°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 high | 27°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 mean | 21°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 low | 15°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 minimum | 11°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) |
Minimum | 8°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 temperature, precipitation, sunshine, UV index in Portland, New South Wales, Australia with other places around the world.
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.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
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) | 7 | 10 | 12 | 3 | 5 | 4 | 5 | 7 | 5 | 10 | 11 | 10 |
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.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 266 | 277 | 269 | 260 | 236 | 201 | 232 | 262 | 277 | 287 | 299 | 323 |
Mean daily daylight hours | 14h 4m | 13h 16m | 12h 15m | 11h 13m | 10h 23m | 9h 57m | 10h 10m | 10h 54m | 11h 53m | 12h 54m | 13h 49m | 14h 18m |
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.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
UV Index (month maximum) | 15 | 14 | 12 | 8 | 6 | 4 | 4 | 6 | 8 | 11 | 13 | 15 |