Last updated: June 24, 2025
In Oregon, United States, the average temperature in May hovers around 18°C (65°F), providing a pleasant climate for outdoor activities. However, temperatures can fluctuate significantly, with a minimum of 3°C (37°F) and a maximum reaching up to 37°C (98°F). Be prepared for some rain, as the region experiences 168 mm (6.6 in) of precipitation over 13 days. Additionally, the average humidity is a notable 82%, creating a tropical feel throughout the month.
In May in Oregon, the average temperature is 18°C (65°F). Maximum temperatures can reach as high as 37°C (98°F), while minimums can drop to as low as 3°C (37°F). This variation means that travelers should be prepared for both warm days and cooler nights.
In Oregon in May, the total precipitation amount is 168 mm (6.6 in) over the course of 13 days.
In Oregon in May, humidity is 82%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can quickly leave travelers feeling fatigued and in need of frequent breaks to stay refreshed and hydrated.
In Oregon in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Oregon.
UV Risk Categories
Weather in Oregon varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Oregon, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 41 mm (1.6 inches) | 76% | moderate |
| February Weather | -1°C (30°F) | 31 mm (1.2 inches) | 77% | moderate |
| March Weather | 7°C (45°F) | 92 mm (3.6 inches) | 70% | high |
| April Weather | 12°C (53°F) | 82 mm (3.2 inches) | 73% | very high |
| May Weather | 18°C (65°F) | 168 mm (6.6 inches) | 82% | very high |
| June Weather | 25°C (77°F) | 132 mm (5.2 inches) | 82% | extreme |
| July Weather | 26°C (79°F) | 119 mm (4.7 inches) | 81% | extreme |
| August Weather | 24°C (76°F) | 110 mm (4.3 inches) | 78% | very high |
| September Weather | 22°C (71°F) | 83 mm (3.2 inches) | 71% | very high |
| October Weather | 13°C (56°F) | 123 mm (4.8 inches) | 71% | high |
| November Weather | 6°C (43°F) | 40 mm (1.6 inches) | 81% | moderate |
| December Weather | 2°C (36°F) | 32 mm (1.3 inches) | 84% | moderate |