You should expect the average temperature in Ketchikan in May is 8, with highs being around 12 and lows being 7 degrees celsius. We have put some more detail below here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 8 |
| High Temperature | 12 |
| Low Temperature | 7 |
| Sunshine Per Day | 11 |
Useful Links: Ketchikan Weather: Average Weather & Yearly Climate