Last updated: March 2, 2024
The weather in Johnson City, United States, during September is characterized by an average temperature of 20°C (68°F). Highs can soar to 29°C (84°F), while lows may dip to 9°C (49°F). Typically, the humidity level in Johnson City throughout September hovers around 68%.
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Average temperature
Maximum temperature
Humidity
In September, Johnson City averages 97 mm (3.8 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 12 hours 21 minutes of daylight, with the sun shining for approximately 9 hours 36 minutes each day. Additionally, there is a 51% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Johnson City reaches a maximum of 10, 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 | 8 | 10 | 9 | 8 | 5 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | Moderate | Low | |||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 30 min | 45 min | |||||||