Last updated: March 2, 2024
The weather in Grafton, United States, during September is characterized by an average temperature of 18°C (65°F). Highs can soar to 28°C (82°F), while lows may dip to 9°C (48°F). Typically, the humidity level in Grafton throughout September hovers around 79%.
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Average temperature
Maximum temperature
Humidity
In September, Grafton averages 100 mm (3.9 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 26 minutes of daylight, with the sun shining for approximately 9 hours 25 minutes each day. Additionally, there is a 55% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Grafton 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 | 3 | 4 | 6 | 7 | 7 | 7 | 5 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||