Last updated: March 2, 2024
The weather in Butte, United States, during September is characterized by an average temperature of 7°C (45°F). Highs can soar to 15°C (60°F), while lows may dip to -3°C (27°F). Typically, the humidity level in Butte throughout September hovers around 96%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Butte averages 127 mm (5.0 inches) of rainfall, typically over the course of 18 rainy days. The month enjoys an average of 12 hours 47 minutes of daylight, with the sun shining for approximately 6 hours 12 minutes each day. Additionally, there is a 24% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Butte reaches a maximum of 4, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||