Last updated: March 2, 2024
The weather in Ypsilanti, United States, during September is characterized by an average temperature of 19°C (66°F). Highs can soar to 32°C (90°F), while lows may dip to 6°C (43°F). Typically, the humidity level in Ypsilanti throughout September hovers around 80%.
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Humidity
In September, Ypsilanti averages 62 mm (2.4 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 25 minutes of daylight, with the sun shining for approximately 9 hours 33 minutes each day. Additionally, there is a 53% probability of sunny days during this period.
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In September, the UV Index in Ypsilanti reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 7 | 7 | 7 | 6 | 5 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||