Last updated: March 2, 2024
The weather in Grantsville, United States, during September is characterized by an average temperature of 18°C (64°F). Highs can soar to 29°C (84°F), while lows may dip to 6°C (43°F). Typically, the humidity level in Grantsville throughout September hovers around 68%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Grantsville averages 119 mm (4.7 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 12 hours 23 minutes of daylight, with the sun shining for approximately 9 hours 27 minutes each day. Additionally, there is a 48% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Grantsville reaches a maximum of 8, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 2 | 4 | 6 | 8 | 8 | 8 | 6 | 4 | 3 | 1 | 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 | ||||||