Typically the average temperate in Formia in May is 15 with a typical high being 22 degrees celsius and a low of 12 celsius.
| Month | Degrees Celsius |
|---|---|
| Temperature | 15 |
| High Temperature | 22 |
| Low Temperature | 12 |
| Sunshine Per Day | 9 |
Useful Links: Formia Weather: Average Weather & Yearly Climate