Last updated: June 24, 2025
In June, the average temperature in Portland, United States hovers around 20°C (69°F), offering a pleasant climate. However, temperatures can vary significantly, ranging from a cool 6°C (43°F) to a scorching 40°C (104°F). Expect about 91 mm (3.6 in) of precipitation over 9 days, contributing to an average humidity of 79%. This combination makes for an interesting mix of weather patterns throughout the month.
In June in Portland, the average temperature is 20°C (69°F). Maximums can reach 40°C (104°F), and minimums can drop as low as 6°C (43°F). It's advisable to pack for both warm and cool weather when traveling during this time.
In Portland in June, the precipitation amount is 91 mm (3.6 in) spread over 9 days.
In Portland in June humidity is 79%. With an average temperature of 20°C (69°F), this humidity feels like a warm, steamy embrace, making travel slightly uncomfortable as the air feels heavy and sticky, often leaving you yearning for a cool breeze or air conditioning to escape the dampness.
In Portland in June, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Portland.
UV Risk Categories
Weather in Portland varies notably across the year, with each month offering distinct climate conditions. This page compares June’s weather to other months in Portland, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -12°C (10°F) | 18 mm (0.7 inches) | 90% | low |
| February Weather | -13°C (9°F) | 19 mm (0.8 inches) | 92% | moderate |
| March Weather | -3°C (27°F) | 27 mm (1.1 inches) | 85% | moderate |
| April Weather | 4°C (39°F) | 41 mm (1.6 inches) | 81% | high |
| May Weather | 13°C (56°F) | 55 mm (2.2 inches) | 75% | very high |
| June Weather | 20°C (69°F) | 91 mm (3.6 inches) | 79% | very high |
| July Weather | 22°C (72°F) | 62 mm (2.4 inches) | 76% | very high |
| August Weather | 20°C (68°F) | 81 mm (3.2 inches) | 78% | very high |
| September Weather | 15°C (60°F) | 68 mm (2.7 inches) | 77% | high |
| October Weather | 6°C (44°F) | 79 mm (3.1 inches) | 79% | moderate |
| November Weather | -2°C (28°F) | 21 mm (0.8 inches) | 86% | moderate |
| December Weather | -8°C (18°F) | 39 mm (1.5 inches) | 86% | low |