Average temperature in Mainz throughout the duration of May is 12. Highs are expected to be 19 with low daily temperautes being 9 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 12 |
| High Temperature | 19 |
| Low Temperature | 9 |
Useful Links: Mainz Weather: Average Weather & Yearly Climate