Last updated: March 2, 2024
The weather in Ankeny, United States, during September is characterized by an average temperature of 20°C (68°F). Highs can soar to 33°C (91°F), while lows may dip to 7°C (45°F). Typically, the humidity level in Ankeny throughout September hovers around 73%.
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Average temperature
Maximum temperature
Humidity
In September, Ankeny averages 122 mm (4.8 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 9 hours 16 minutes each day. Additionally, there is a 68% probability of sunny days during this period.
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Chance of sun
In September, the UV Index in Ankeny 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 | 6 | 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 | ||||||