Last updated: March 2, 2024
The weather in Rapperswil, Switzerland, during September is characterized by an average temperature of 14°C (57°F). Highs can soar to 25°C (77°F), while lows may dip to 4°C (40°F). Typically, the humidity level in Rapperswil throughout September hovers around 83%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Rapperswil averages 123 mm (4.9 inches) of rainfall, typically over the course of 14 rainy days. The month enjoys an average of 12 hours 30 minutes of daylight, with the sun shining for approximately 10 hours 28 minutes each day. Additionally, there is a 43% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Rapperswil reaches a maximum of 6, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 25 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 | 3 | 4 | 6 | 6 | 6 | 5 | 4 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||