Typically the weather in Knoxville during the time of September is 20 with a general average high of 28 and low average expected to be 16 celsius. The table below includes more detail:
| Month | Degrees Celsius |
|---|---|
| Temperature | 20 |
| High Temperature | 28 |
| Low Temperature | 16 |
Useful Links: Knoxville Weather: Average Weather & Yearly Climate