Last updated: March 2, 2024
The weather in Saint John, United States, during May is characterized by an average temperature of 18°C (65°F). Highs can soar to 32°C (90°F), while lows may dip to 5°C (41°F). Typically, the humidity level in Saint John throughout May hovers around 82%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Saint John averages 168 mm (6.6 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 14 hours 14 minutes of daylight, with the sun shining for approximately 9 hours 40 minutes each day. Additionally, there is a 33% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In May, the UV Index in Saint John reaches a maximum of 10, 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 | 1 | 3 | 5 | 7 | 9 | 10 | 10 | 9 | 7 | 4 | 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 | ||||||