Last updated: June 24, 2025
In September, the average temperature in Cleveland, United States hovers around 18°C (65°F), with fluctuating extremes from a brisk 3°C (37°F) to a warm 33°C (91°F). Expect about 144 mm (5.7 in) of precipitation spread over 10 days, resulting in an average humidity level of a cozy 81%. Stay prepared for the weather's delightful variances!
In September in Cleveland, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums falling as low as 3°C (37°F). This makes it an ideal time for travelers who enjoy mild to warm weather, but it's wise to pack for both warm days and cooler evenings.
In Cleveland in September, the precipitation amount is 144 mm (5.7 in) over a duration of 10 days.
In Cleveland in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.
In Cleveland 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 Cleveland.
UV Risk Categories
Weather in Cleveland varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Cleveland, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 33 mm (1.3 inches) | 87% | moderate |
| February Weather | -9°C (16°F) | 37 mm (1.5 inches) | 90% | moderate |
| March Weather | 1°C (34°F) | 67 mm (2.6 inches) | 85% | moderate |
| April Weather | 7°C (44°F) | 87 mm (3.4 inches) | 84% | very high |
| May Weather | 15°C (60°F) | 131 mm (5.1 inches) | 78% | very high |
| June Weather | 22°C (72°F) | 109 mm (4.3 inches) | 80% | very high |
| July Weather | 23°C (75°F) | 115 mm (4.5 inches) | 81% | very high |
| August Weather | 22°C (71°F) | 137 mm (5.4 inches) | 81% | very high |
| September Weather | 18°C (65°F) | 144 mm (5.7 inches) | 81% | very high |
| October Weather | 9°C (49°F) | 89 mm (3.5 inches) | 84% | moderate |
| November Weather | 1°C (34°F) | 34 mm (1.3 inches) | 88% | moderate |
| December Weather | -4°C (25°F) | 44 mm (1.7 inches) | 84% | low |