Hi
@kcfaye. Although the temperature will be warmer, the wind can be chilly at times. Capris will be fine, along with a t shirt and perhaps a zipped hoodie, also a light jacket in case of rain (I would wear these during June) I'm fairly certain it wont be too cold.....although Id be too scared to wear a swim costume.

I visited the Gairloch in July a couple of years ago and the weather was soo hot, but the only way to enjoy a paddle in the sea without getting too cold was to wear a wet suit!
Also, for the members of your group who enjoy the
Outlander series, VisitScotland .com have a lot of great information about the filming locations and a free Outlander map to download.
Have a great time during your visit to Scotland!