Typically the average temperate in Ko Samui throughout the duration of June is 27. You can expect a high of 32 with low daily temperautes being 26 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 27 |
| High Temperature | 32 |
| Low Temperature | 26 |
| Sunshine Per Day | 7 |
Useful Links: Ko Samui Weather: Average Weather & Yearly Climate