Last updated: June 24, 2025
In September, the average temperature in Grosse Ile, United States is a pleasant 19°C (67°F). However, be prepared for a range, as temperatures can dip to a minimum of 4°C (40°F) or soar up to a maximum of 33°C (92°F). Rainfall is moderate, with 61 mm (2.4 in) spread over about 10 days, and the air tends to be quite humid, averaging around 80%.
In September in Grosse Ile, the average temperature is 19°C (67°F). Maximums can reach 33°C (92°F) while minimums can be as low as 4°C (40°F). This range makes it an ideal time for travelers to enjoy a variety of outdoor activities while also being prepared for cooler evenings.
In Grosse Ile in September, the precipitation amount is 61 mm (2.4 in) over a span of 10 days.
In Grosse Ile in September humidity is 80%. With an average temperature of 19°C (67°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor exploration a bit uncomfortable and sticky, yet it encourages you to seek out refreshing indoor activities or shaded spots to escape the heat.
In Grosse Ile in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Grosse Ile.
UV Risk Categories
Weather in Grosse Ile varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grosse Ile, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (28°F) | 68 mm (2.7 inches) | 88% | low |
| February Weather | -2°C (29°F) | 69 mm (2.7 inches) | 87% | moderate |
| March Weather | 3°C (37°F) | 73 mm (2.9 inches) | 85% | moderate |
| April Weather | 8°C (47°F) | 89 mm (3.5 inches) | 86% | very high |
| May Weather | 15°C (60°F) | 114 mm (4.5 inches) | 80% | very high |
| June Weather | 21°C (71°F) | 82 mm (3.2 inches) | 80% | very high |
| July Weather | 24°C (76°F) | 86 mm (3.4 inches) | 80% | very high |
| August Weather | 23°C (74°F) | 75 mm (3.0 inches) | 80% | very high |
| September Weather | 19°C (67°F) | 61 mm (2.4 inches) | 80% | very high |
| October Weather | 13°C (55°F) | 100 mm (3.9 inches) | 84% | moderate |
| November Weather | 4°C (40°F) | 81 mm (3.2 inches) | 89% | moderate |
| December Weather | 1°C (33°F) | 59 mm (2.3 inches) | 86% | low |