Last updated: March 2, 2024
The weather in Monticello, United States, during September is characterized by an average temperature of 19°C (66°F). Highs can soar to 31°C (88°F), while lows may dip to 6°C (43°F). Typically, the humidity level in Monticello throughout September hovers around 79%.
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Average temperature
Maximum temperature
Humidity
In September, Monticello averages 118 mm (4.6 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 8 hours 56 minutes each day. Additionally, there is a 61% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Monticello reaches a maximum of 8, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, 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 | 7 | 8 | 7 | 5 | 4 | 2 | 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 | ||||||