Usually average temperatures are Port Glasgow throughout the time of May is 8. Average highs are typically 11 and low of 6 degrees. With the details being further below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 8 |
| High Temperature | 11 |
| Low Temperature | 6 |
| Sunshine Per Day | 7 |
Useful Links: Port Glasgow Weather: Average Weather & Yearly Climate