Last updated: March 2, 2024
The weather in St. Mary's, United States, during September is characterized by an average temperature of 8°C (47°F). Highs can soar to 17°C (62°F), while lows may dip to 0°C (33°F). Typically, the humidity level in St. Mary's throughout September hovers around 92%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, St. Mary's averages 91 mm (3.6 inches) of rainfall, typically over the course of 14 rainy days. The month enjoys an average of 12 hours 48 minutes of daylight, with the sun shining for approximately 5 hours 13 minutes each day. Additionally, there is a 21% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in St. Mary's reaches a maximum of 3, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 30 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 | 0 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 2 | 1 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||