Last updated: June 24, 2025
In September, the average temperature in Alpena, United States is a comfortable 16°C (61°F). However, temperatures can range from a chilly 2°C (37°F) to a warm 31°C (88°F). Prepare for some rain, as 77 mm (3.0 in) of precipitation is expected over 11 days, with humidity hovering around a tropical 79%.
In September in Alpena, the average temperature is 16°C (61°F), with maximums potentially reaching 31°C (88°F) and minimums dropping to as low as 2°C (37°F). This weather makes it an ideal time for travelers to enjoy a variety of outdoor activities while packing for both warm days and cooler nights.
In Alpena in September, the precipitation amount is 77 mm (3.0 in) over the course of 11 days.
In Alpena in September humidity is 79%. With an average temperature of 16°C (61°F), this humidity feels like a warm, moist embrace, making travel a bit more challenging as the air tends to weigh heavily, but it also offers a refreshing atmosphere perfect for exploring local sights and enjoying nature.
In Alpena in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Alpena.
UV Risk Categories
Weather in Alpena varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Alpena, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 52 mm (2.0 inches) | 92% | low |
| February Weather | -5°C (23°F) | 56 mm (2.2 inches) | 91% | moderate |
| March Weather | -1°C (31°F) | 61 mm (2.4 inches) | 87% | moderate |
| April Weather | 4°C (39°F) | 94 mm (3.7 inches) | 85% | high |
| May Weather | 10°C (51°F) | 84 mm (3.3 inches) | 79% | very high |
| June Weather | 16°C (61°F) | 91 mm (3.6 inches) | 75% | very high |
| July Weather | 20°C (69°F) | 86 mm (3.4 inches) | 75% | very high |
| August Weather | 20°C (68°F) | 84 mm (3.3 inches) | 75% | very high |
| September Weather | 16°C (61°F) | 77 mm (3.0 inches) | 79% | high |
| October Weather | 10°C (50°F) | 108 mm (4.3 inches) | 85% | moderate |
| November Weather | 3°C (37°F) | 67 mm (2.6 inches) | 88% | moderate |
| December Weather | -2°C (29°F) | 62 mm (2.4 inches) | 89% | low |