Normally average temperatures in Ascona in May is 13 with a high of 19 with low average temperatures being 11. Our table below has the full details:
| Month | Degrees Celsius |
|---|---|
| Temperature | 13 |
| High Temperature | 19 |
| Low Temperature | 11 |
| Sunshine Per Day | 7 |
Useful Links: Ascona Weather: Average Weather & Yearly Climate