Last updated: March 2, 2024
The weather in Portland, United States, during May is characterized by an average temperature of 15°C (59°F). Highs can soar to 31°C (88°F), while lows may dip to 2°C (36°F). Typically, the humidity level in Portland throughout May hovers around 75%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Portland averages 139 mm (5.5 inches) of rainfall, typically over the course of 15 rainy days. The month enjoys an average of 14 hours 44 minutes of daylight, with the sun shining for approximately 8 hours 43 minutes each day. Additionally, there is a 35% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In May, the UV Index in Portland reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 2 | 3 | 5 | 7 | 8 | 9 | 8 | 7 | 5 | 3 | 2 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||