Last updated: August 23, 2025
In September, the average temperature in Illmensee, Germany is a comfortable 15°C (60°F), with minimums dipping to 4°C (40°F) and maximums rising to a warm 28°C (82°F). Expect some precipitation with around 93 mm (3.7 in) falling over 11 days, while the average humidity sits at a high 83%, making for a refreshing atmosphere.
In September in Illmensee, the average temperature is 15°C (60°F). Maximums can reach 28°C (82°F), and minimums can be as low as 4°C (40°F). It's a great time to visit Illmensee if you enjoy mild weather with a chance to experience both warmer and cooler days.
In Illmensee in September, the precipitation amount is 93 mm (3.7 in) over the course of 11 days, indicating that rain is expected to be fairly frequent during that time.
In Illmensee 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 Illmensee 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 Illmensee, you can refer to this Hourly UV Index in Illmensee.
UV Risk Categories
Weather in Illmensee varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Illmensee, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 87 mm (3.4 inches) | 92% | low |
| February Weather | 3°C (38°F) | 72 mm (2.8 inches) | 89% | moderate |
| March Weather | 6°C (42°F) | 80 mm (3.1 inches) | 87% | moderate |
| April Weather | 10°C (50°F) | 61 mm (2.4 inches) | 84% | high |
| May Weather | 14°C (57°F) | 123 mm (4.9 inches) | 80% | very high |
| June Weather | 19°C (66°F) | 139 mm (5.5 inches) | 82% | very high |
| July Weather | 20°C (68°F) | 111 mm (4.4 inches) | 83% | very high |
| August Weather | 20°C (68°F) | 143 mm (5.6 inches) | 80% | very high |
| September Weather | 15°C (60°F) | 93 mm (3.7 inches) | 83% | high |
| October Weather | 11°C (52°F) | 96 mm (3.8 inches) | 90% | moderate |
| November Weather | 5°C (42°F) | 59 mm (2.3 inches) | 88% | low |
| December Weather | 3°C (37°F) | 111 mm (4.4 inches) | 90% | low |