Last updated: August 23, 2025
In Isterberg, Germany, the average temperature in September hovers around 15°C (59°F). Temperature extremes can vary significantly, with a minimum of 3°C (37°F) and a maximum reaching 32°C (89°F). Expect precipitation of about 63 mm (2.5 in) over 10 days, coupled with an average humidity of 83%. Stay prepared for a mix of weather this month!
In September in Isterberg, the average temperature is 15°C (59°F). Maximums can reach 32°C (89°F), and minimums can be as low as 3°C (37°F). This makes it a great time for travelers to enjoy a mix of warm days and cooler evenings, perfect for outdoor adventures and sightseeing.
In Isterberg in September, the precipitation amount is 63 mm (2.5 in) over a span of 10 days.
In Isterberg in September humidity is 83%. With an average temperature of 15°C (59°F), this humidity feels like a cozy, damp embrace that can be quite stifling for traveling, making even short walks feel more exhausting than they should, and prompting a need for frequent breaks in shaded or air-conditioned areas.
In Isterberg in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Isterberg.
UV Risk Categories
Weather in Isterberg varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Isterberg, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (39°F) | 66 mm (2.6 inches) | 88% | low |
| February Weather | 4°C (40°F) | 74 mm (2.9 inches) | 88% | low |
| March Weather | 6°C (44°F) | 76 mm (3.0 inches) | 86% | moderate |
| April Weather | 10°C (50°F) | 37 mm (1.5 inches) | 84% | moderate |
| May Weather | 14°C (57°F) | 63 mm (2.5 inches) | 80% | high |
| June Weather | 19°C (66°F) | 64 mm (2.5 inches) | 75% | very high |
| July Weather | 19°C (66°F) | 75 mm (3.0 inches) | 75% | very high |
| August Weather | 19°C (66°F) | 73 mm (2.9 inches) | 75% | high |
| September Weather | 15°C (59°F) | 63 mm (2.5 inches) | 83% | moderate |
| October Weather | 12°C (54°F) | 87 mm (3.4 inches) | 86% | moderate |
| November Weather | 7°C (45°F) | 55 mm (2.2 inches) | 87% | low |
| December Weather | 5°C (41°F) | 90 mm (3.5 inches) | 86% | low |