Last updated: March 2, 2024
The weather in Saint John, Canada, during September is characterized by an average temperature of 15°C (59°F). Highs can soar to 20°C (69°F), while lows may dip to 9°C (48°F). Typically, the humidity level in Saint John throughout September hovers around 82%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Saint John averages 108 mm (4.3 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 28 minutes of daylight, with the sun shining for approximately 8 hours 52 minutes each day. Additionally, there is a 42% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Saint John reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 25 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 | 2 | 3 | 5 | 6 | 7 | 7 | 6 | 4 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||