Last updated: March 2, 2024
The weather in Lewiston, United States, during May is characterized by an average temperature of 9°C (49°F). Highs can soar to 24°C (76°F), while lows may dip to -5°C (23°F). Typically, the humidity level in Lewiston throughout May hovers around 62%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Lewiston averages 66 mm (2.6 inches) of rainfall, typically over the course of 13 rainy days. The month enjoys an average of 14 hours 34 minutes of daylight, with the sun shining for approximately 10 hours 55 minutes each day. Additionally, there is a 50% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In May, the UV Index in Lewiston reaches a maximum of 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 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 | 8 | 10 | 11 | 11 | 9 | 7 | 4 | 2 | 1 |
| Exposure | Low | Moderate | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | |||||
| Time to burn | 45 min | 30 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | |||||