Usually average temperatures are Rouen in August is 15 with a general average high of 22 and low of 12 degrees. For more context we have put some more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 15 |
| High Temperature | 22 |
| Low Temperature | 12 |
| Sunshine Per Day | 7 |
Useful Links: Rouen Weather: Average Weather & Yearly Climate