Last updated: August 27, 2025
In September, the average temperature in Grossacker/Opfikon, Switzerland hovers around 15°C (60°F), with the possibility of dipping to a chilly 3°C (38°F) or soaring to a warm 29°C (84°F). Expect about 80 mm (3.2 in) of precipitation over 11 days, contributing to an average humidity of 83%. Plan accordingly for a mix of mild days and wet weather!
In September in Grossacker/Opfikon, the average temperature is 15°C (60°F). Maximum temperatures can reach 29°C (84°F), while the minimum can drop as low as 3°C (38°F). It's advisable to pack layers to comfortably enjoy all the activities this month in Grossacker/Opfikon has to offer.
In Grossacker/Opfikon in September, the precipitation amount is 80 mm (3.2 in) spread over 11 days.
In Grossacker/Opfikon in September humidity is 83%. With an average temperature of 15°C (60°F), this humidity feels like a damp blanket wrapping around you, making travel a bit uncomfortable and sticky, as the air clings to your skin and dampens your clothes.
In Grossacker/Opfikon in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Grossacker/Opfikon, you can refer to this Hourly UV Index in Grossacker/Opfikon.
UV Risk Categories
Weather in Grossacker/Opfikon varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grossacker/Opfikon, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 95 mm (3.7 inches) | 92% | low |
| February Weather | 3°C (39°F) | 75 mm (3.0 inches) | 89% | moderate |
| March Weather | 6°C (43°F) | 86 mm (3.4 inches) | 87% | moderate |
| April Weather | 10°C (50°F) | 59 mm (2.3 inches) | 84% | high |
| May Weather | 13°C (56°F) | 123 mm (4.8 inches) | 80% | very high |
| June Weather | 19°C (66°F) | 128 mm (5.0 inches) | 82% | very high |
| July Weather | 20°C (68°F) | 99 mm (3.9 inches) | 83% | very high |
| August Weather | 20°C (67°F) | 120 mm (4.7 inches) | 80% | very high |
| September Weather | 15°C (60°F) | 80 mm (3.2 inches) | 83% | high |
| October Weather | 11°C (51°F) | 93 mm (3.6 inches) | 90% | moderate |
| November Weather | 5°C (41°F) | 65 mm (2.6 inches) | 88% | low |
| December Weather | 3°C (37°F) | 124 mm (4.9 inches) | 90% | low |