Last updated: August 23, 2025
In Gross Gronau, Germany, the average temperature in September hovers around 15°C (59°F). Expect a range from a chilly 4°C (39°F) to a warm 30°C (86°F). Be prepared for 50 mm (2.0 in) of precipitation over 9 days, alongside an average humidity of 82%, which adds a touch of mugginess to the air.
In September in Gross Gronau, the average temperature is 15°C (59°F). Maximums can reach 30°C (86°F) and minimums can be as low as 4°C (39°F). It's an ideal time to explore outdoor activities while enjoying mild weather.
In Gross Gronau in September, the precipitation amount is 50 mm (2.0 in) over the course of 9 days.
In Gross Gronau in September, humidity is 82%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and uncomfortable for travelers.
In Gross Gronau 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 Gross Gronau.
UV Risk Categories
Weather in Gross Gronau varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Gross Gronau, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (37°F) | 58 mm (2.3 inches) | 91% | low |
| February Weather | 3°C (38°F) | 50 mm (2.0 inches) | 89% | low |
| March Weather | 5°C (41°F) | 62 mm (2.4 inches) | 87% | moderate |
| April Weather | 8°C (47°F) | 41 mm (1.6 inches) | 83% | moderate |
| May Weather | 13°C (55°F) | 61 mm (2.4 inches) | 78% | high |
| June Weather | 18°C (64°F) | 62 mm (2.4 inches) | 77% | very high |
| July Weather | 18°C (65°F) | 84 mm (3.3 inches) | 77% | high |
| August Weather | 18°C (65°F) | 76 mm (3.0 inches) | 75% | high |
| September Weather | 15°C (59°F) | 50 mm (2.0 inches) | 82% | moderate |
| October Weather | 11°C (52°F) | 69 mm (2.7 inches) | 86% | moderate |
| November Weather | 6°C (44°F) | 45 mm (1.8 inches) | 89% | low |
| December Weather | 4°C (39°F) | 63 mm (2.5 inches) | 92% | low |